US 8,615,362 B2Grant
Near-surface geomorphological characterization based on remote sensing data
Issue Date:2013-12-24
•47 Claims
•17 Drawing Sheets
Abstract
A technique includes receiving first data belonging to a first type of remote sensing data for a region of interest and receiving second data belonging to a different second type of remote sensing data for the region of interest. The technique includes determining at least one geomorphological feature of the region of interest based at least in part on the first and second data.
Metadata
Assignee
- WesternGeco L.L.C.
Inventor
- Andreas Laake
Application Information
Application Number:US 12/568,322
Filing Date:2009-09-28
Priority Date:2008-10-10
Art Unit:3645
Classifications
IPC:
G06T17/05G01V8/00G01S13/86G01S13/89G01S17/89
Field of Search:
G06T 17/05G01S 13/865G01S 13/89
Patent Drawings (17 sheets)
Description
[0001] This application claims the benefit under 35 U.S.C. §119(e) to U.S. Provisional Patent Application Ser. No. 61/104,977, entitled, “STATICS CORRECTION ESTIMATION FROM REMOTE SENSING DATA,” which was filed on Oct. 13, 2008; U.S. Provisional Patent Application Ser. No. 61/104,980, entitled, “GENERATION OF LOGISTIC AND DATA QUALITY RISK MAPS FROM REMOTE SENSING BASED GEOMORPHOLOGIC ANALYSIS OF THE EARTH,” which was filed on Oct. 13, 2008; and U.S. Provisional Patent Application Ser. No. 61/104,582, entitled, “RECONSTRUCTION OF A PRE-EROSION SURFACE,” which was filed on Oct. 10, 2008. Each of these applications is hereby incorporated by reference in its entirety.
Background
[0002] The invention generally relates to near-surface geomorphological characterization based on remote sensing data.
[0003] Seismic exploration involves surveying subterranean geological formations for hydrocarbon deposits. A survey typically involves deploying seismic source(s) and seismic sensors at predetermined locations. The sources generate seismic waves, which propagate into the geological formations creating pressure changes and vibrations along their way. Changes in elastic properties of the geological formation reflect, refract or scatter the seismic waves, changing their direction of propagation and other properties. Part of the energy emitted by the sources reaches the seismic sensors. Some seismic sensors are sensitive to pressure changes (hydrophones), others to particle motion (e.g., geophones), and industrial surveys may deploy only one type of sensors or both. In response to the detected seismic events, the sensors generate electrical signals to produce seismic data. Analysis of the seismic data can then indicate the presence or absence of probable locations of hydrocarbon deposits.
[0004] The understanding of the surface and near-surface of a candidate region to be surveyed is paramount for such purposes as evaluating the candidate region for a potential survey and if selected for the survey, planning the survey and interpreting the results of the survey. For example, in a seismic survey in which a vibrator is to be used as the seismic source, some regions may not be suitable for the vibrator: relatively hard rock may result in point loading where only part of the baseplate of the vibrator is coupled to ground; and relatively soft ground may not support the hold down weight and thus, may compact during the sweep as well as undesirably absorb particularly high frequencies. Knowledge of the surface and near-surface may also be useful in evaluating the accessibility of the region for certain vehicles. For example, escarpments and soft ground may affect logistical access to the survey area. For post survey processing, the elastic properties of the near-surface typically are estimated for purposes of performing static corrections to the acquired seismic data.
Summary
[0005] In an embodiment of the invention, a technique includes receiving first data belonging to a first type of remote sensing data for a region of interest and receiving second data belonging to a different second type of remote sensing data for the region of interest. The technique includes determining at least one geomorphological feature of the region of interest based at least in part on the first and second data.
[0006] Advantages and other features of the invention will become apparent from the following drawing, description and claims.
Brief Description of the Drawing
[0007] FIG. 1 is an illustration of the different types and uses of remote sensing data according to an embodiment of the invention.
[0008] FIG. 2 is a flow chart depicting a technique to perform near-surface geomorphological characterization based on remote sensing data according to an embodiment of the invention.
[0009] FIG. 3 is a flow chart depicting a technique to use remote sensing data to determine a risk map using near-surface geomorphological characterization based on remote sensing data according to an embodiment of the invention.
[0010] FIG. 4 is an illustration of a work flow for generating risk maps using near-surface geomorphological characterization based on remote sensing data according to an embodiment of the invention.
[0011] FIG. 5 is an illustration of a work flow for determining a topography classification based on a digital elevation model according to an embodiment of the invention.
[0012] FIG. 6 is an illustration of a data flow for determining a topographic classification according to an embodiment of the invention.
[0013] FIG. 7 depicts an exemplary elevation histogram according to an embodiment of the invention.
[0014] FIG. 8 depicts an exemplary elevation hypsographic curve according to an embodiment of the invention.
[0015] FIG. 9 is a schematic diagram depicting a data flow for detecting topography edges according to an embodiment of the invention.
[0016] FIG. 10 is an illustration of a work flow for determining lithology classification using satellite-acquired multispectral imagery according to an embodiment of the invention.
[0017] FIG. 11 is an exemplary lithology histogram according to an embodiment of the invention.
[0018] FIG. 12 is a table illustrating information that may be conveyed by risk maps that are derived using near-surface geomorphological characterization based on remote sensing data according to an embodiment of the invention.
[0019] FIG. 13 is an illustration of a work flow for generating a logistic risk map according to an embodiment of the invention.
[0020] FIG. 14 is an illustration of a work flow for generating a data quality scatter risk map and a data quality velocity risk map according to an embodiment of the invention.
[0021] FIG. 15 depicts an exemplary statistical analysis of logistic and data quality risks according to an embodiment of the invention.
[0022] FIG. 16 is a flow diagram depicting a technique to determine static corrections using near-surface geomorphological characterization based on remote sensing data according to an embodiment of the invention.
[0023] FIG. 17 is an illustration of a work flow to estimate statics from a digital elevation model and satellite-acquired multispectral imagery according to an embodiment of the invention.
[0024] FIGS. 18 and 19 are flow charts depicting techniques to determine a pre-erosion map using near-surface geomorphological characterization based on remote sensing data according to embodiments of the invention.
[0025] FIG. 20 is a flow chart depicting a technique to identify active faults using near-surface geomorphological characterization based on remote sensing data according to an embodiment of the invention
[0026] FIG. 21 is a schematic diagram of a data processing system according to an embodiment of the invention.
Detailed Description
[0027] Referring to FIG. 1 , a seismic survey in a particular region of interest (ROI) 14 of the Earth's surface 12 may encounter various challenges due to the surface and near-surface characteristics of the ROI 14. To evaluate the ROI 14 for purposes of planning the survey and interpreting data acquired in the survey, remote sensing data 16 may be gathered. The remote sensing data 16 indicates various features 20 of the ROI 14, and may include, as an example, a digital elevation model 17, which indicates a topography 22 and surface slopes 24 of the ROI 14. The digital elevation model 17 may be acquired using satellite radar or light detection and ranging (LIDAR) technology, as non-limiting examples. The remote sensing data 16 may also include satellite-acquired multispectral imagery 18 that indicates the lithology 28 and land use (vegetation, etc) of the ROI 14; and satellite-acquired radar imagery 19, which may indicate the presence of one or more dry river beds, or wadis 34, in the ROI 14.
[0028] As described herein, the geomorphology of the ROI 14 is characterized for purposes of determining surface and near-surface features of the ROI 14. In general, geomorphology is the science of landforms, which studies the evolution of the Earth's surface and interprets landforms as records of geological history. As described below, the geomorphologic characterization is based on at least two different types of the remote sensing data 16.
[0029] As non-limiting examples and as further described herein, the near-surface geomorphological characterization may be used for such purposes as estimating and interpreting risks for the logistics involved in conducting a seismic survey in the ROI 14; estimating and interpreting risks that affect the quality of seismic data acquired in a seismic survey that is conducted in the ROI 14; determining static corrections to apply to seismic data acquired in the seismic survey; determining tectonic features of the ROI 14; and determining pre-erosion maps for the ROI 14.
[0030] Referring to FIG. 2 in conjunction with FIG. 1 , in accordance with embodiments of the invention described herein, a technique 50 includes receiving (block 54) first data that belongs to a first type of remote sensing data for the ROI 14 and receiving (block 58) second data that belongs to a different second type of remote sensing data for the ROI 14. The technique 50 includes determining (block 62) at least one geomorphological feature of the ROI 14 based at least in part on the first and second data.
[0031] As a first example, the near-surface geomorphological characterization is used to assess risks in logistics and data quality in connection with a potential seismic survey to be conducted in the ROI 14. More specifically, in this application, the surface topography (derived from the digital elevation model 17) and the lithology (derived from satellite-acquired multispectral imagery 18) are linked together for purposes of generating the following risk maps: a logistic risk map, which highlights areas of the ROI 14 with access restrictions (areas that have limited vehicle access, areas that have limited access for wheeled vehicles, etc.); and a data quality risk map, which shows areas that pose a scattering risk to the data quality, areas that pose risks to the data quality related to surface velocities, etc.
[0032] As a more specific and non-limiting example, the logistic risk map may indicate regions with no or limited vehicle access due to such features as escarpments, terrain edges, soft clay and sabkha and may also indicate regions with difficult terrains for wheeled vehicles, such as areas with hard rough surface rock, for example.
[0033] The data quality risk map may indicate regions with a scattering risk due to topography boundaries, such as terrain edges and escarpments and regions with a scattering risk from lithology boundaries due to changes in the surface rock.
[0034] The risk map may also indicate risks related to surface velocities. For example, one type of velocity risk is a vibrator point loading risk, which results when only part of the base plate of the vibrator is coupled to ground.
[0035] The velocity risk map may also indicate regions with other types of velocity risks. For example, the map may indicate regions that are very soft and do not support the vibrator's hold down weight. These areas may compact during the sweep as well as absorb particularly high frequencies. Furthermore, the map may indicate areas that pose velocity risks due to the elastic properties of the geological layers in the near-surface, their shape and layering, etc., which affects reception of seismic signals by the seismic receivers. In this manner, the surface wavefield is recorded by the seismic receivers together with a body wavefield that contains the target reflections. The surface layers and their elastic properties determine the quality of the coupling of the receivers to the seismic wavefield.
[0036] In determining the risk maps, the topography (derived from the digital elevation model 17) and lithology (derived from the satellite-acquired multispectral imagery 18) are jointly interpreted because the shape of the Earth's surface is determined by the resistance of the rock layers against erosion and by their layering. Therefore, by combining the remote sensing data indicative of the topography and lithology, the surface information that is acquired from the remote sensing may be extended into the near-surface.
[0037] For purposes of generating the risk maps, a spatial statistical analysis of the digital elevation model 17 is performed to classify the topography, and a spectroscopic analysis of the satellite-acquired multispectral imagery is performed to classify the surface rock types. The combination of the two classifications provides the geomorphologic classification of the surface and the near-surface; and risk maps for logistics and data quality may be determined from this geomorphologic classification. As described herein, histograms may be used to provide clues about the severity of the risks and may serve as a valuable ingredient for risk mitigation.
[0038] Thus, referring to FIG. 3 in conjunction with FIG. 1 , in accordance with embodiments of the invention, a technique 70 to generate risk maps includes, in general, receiving (block 74) first data that is indicative of a digital elevation model 17 of the ROI 14 and receiving (block 76) second data indicative of a satellite-acquired spectroscopic imagery 18 of the ROI 14. The technique 70 includes using (block 78) the geomorphological near-surface characterization based on the first and second data to determine risk maps.
[0039] FIG. 4 generally depicts a work flow 100 for generating logistics and data quality risk maps 140 in accordance with embodiments of the invention. Referring to FIG. 4 in conjunction with FIG. 1 , the work flow 100 involves determining topography classification (block 104) as well as determining lithology classification (block 120).
[0040] The topography classification 104 involves performing a statistical analysis 108 of the digital elevation model 17, pursuant to block 108, to derive a topography classification 110. The topography classification 110 determines the terrains (dipping plateau, rough terrain, escarpments, etc.) that are present in the ROI 14; produces a classification map 112, which highlights the terrain boundaries; and generates classification statistics 114, which set forth the relative percentages of the terrain types.
[0041] The lithology classification 120 begins with a spectroscopic analysis (block 126) of the satellite-acquired multispectral imagery 18 for purposes of generating a lithology classification 128, which identifies the various minerals in the ROI 14. A lithology classification map 134, which shows the boundaries of similar rock building minerals, as well as lithology classification statistics 136, which sets forth the relative percentages of the identified minerals may be generated based on the lithology classification 128.
[0042] As a more specific example, in accordance with embodiments of the invention, a work flow 150 that is depicted in FIG. 5 may be used for purposes of determining the topographic classification. Referring to FIG. 5 in conjunction with FIG. 1 , pursuant to the work flow 150, a histogram 152 of the elevations is determined from the digital elevation model 17. From the histogram 152, a hypsographic curve 154 is derived, and from the hypsographic curve 154, a terrain type classification 156 is derived. Also, from the histogram 152, elevation classes 158 are determined, which allows the derivation of an elevation class map 160, topography class map with escarpments 164 and an escarpment map 169. The generation of the escarpment map 169 is further aided by the detection of the boundaries of the escarpments by an edge detection algorithm 168, which detects the boundaries based on a terrain slope 166 that is indicated by the digital elevation model 17.
[0043] FIG. 6 depicts a data flow 170 for performing the topographic classification according to an embodiment of the invention. The topographic classification begins with determining the histogram 152 based on the digital elevation model 17. The population quantities for each equally-spaced elevation class are then summed (boxes 174 and 176) to form a classification histogram 178 and the hypsographic curve 154. Statistical analysis of the classification histogram 178 provides information about the terrain type and geomorphological features such as plateaus, escarpments and rough terrain.
[0044] Referring to FIGS. 7 and 8 in conjunction with FIG. 6 , FIG. 7 depicts an exemplary classification histogram 178, and FIG. 8 depicts the corresponding exemplary elevation hypsographic curve 154. The hypsographic curve 154 is generated from the accumulation of the quantities in the histogram 178 from small to large elevation values. The shape of the hypsographic curve 154 reflects the geomorphologic character of the region of interest. Extracting information about the terrain type and selecting elevation boundaries for statistical analysis is generally easier with a hypsographic curve because escarpments, plateaus and rough topology may be interpreted more easily. Furthermore, terrain classes may be chosen by using a percentage scale rather than by specifying distinct values. Therefore, based on the classification histogram 178 (FIG. 6 ), a topography class map 182 may be constructed.
[0045] FIG. 9 depicts a data flow 200 for determining the escarpment map 169, according to an embodiment of the invention. Referring to FIG. 9 in conjunction with FIG. 1 , the detection of escarpments is particularly important for the logistic and data quality risk maps. Escarpments may be extracted from the gradient of the digital elevation model 17. For a complex terrain, the gradient often shows striations in the orthogonal directions originating from the orthogonal direction for obtaining the spatial derivative. To solve this problem for complex terrains with gradients in all directions, a multi-azimuth edge detection algorithm may be used, such as the one that is set forth in Sobel, I., Feldman, G., “A 3×3 Isotropic Gradient Operator For Image Processing,” presented at a talk at the Stanford Artificial Project in 1968, unpublished but often cited in the following reference: PATTERN CLASSIFICATION AND SCENE ANALYSIS , Duda, R. and Hart, P., John Wiley and Sons, 1973, pp 271-272. Multi-azimuth detection algorithms, other than the one described above may be used in accordance with other embodiments of the invention.
[0046] Pursuant to a multi-azimuth edge detection algorithm, the digital elevation model 17 is convolved (block 202) with a spatial filter to produce n gradient azimuths 204 (gradient azimuths 2041 and 204n being depicted in FIG. 9 , as examples). The gradients 204 are merged via a root mean square (block 208), and the outliers are removed (block 210) to generate the escarpment map 169.
[0047] In accordance with some embodiments of the invention, a work flow 220, which is depicted in FIG. 10 , may be used for purposes of performing lithology classification. Referring to FIG. 10 in conjunction with FIG. 1 , pursuant to the work flow 220, satellite-acquired multi-spectral images 18 are selectively combined to create band ratio images 226. A band ratio image 226 may be created, for example, on a pixel by pixel basis, by dividing each pixel intensity of one of the images 18 by the pixel intensity at the same pixel location of another one of the images 18. The band ratio images 226 may be combined to also produce one or more false color red-green-blue (RGB) images 228. Furthermore, these images may be selectively combined to produce a multi-band RGB image 234, which may aid in visualizing the lithographic classification process.
[0048] A given band ratio combination may be more helpful than other ratio band combinations for purposes of discriminating different minerals, such as carbonates, clastics, clay and sabkha. Therefore, in the lithology classification, a given band ratio combination is selected (block 236) for analysis for purposes of detecting one or more of the minerals. For each mineral to be detected, an iteration is performed in which a pixel value threshold for detecting the mineral is selected, and then only pixel values in the evaluated band combination, which exceed the threshold are registered in a corresponding mask 240 that highlights the mineral. The masks are combined to generate the lithology classification map 134. As non-limiting examples, the masks 240 may include hard rock masks, clay masks and soft rock masks.
[0049] Spatial statistical analysis of the lithologic classification provides the percentage distribution of different minerals in the region of interest. FIG. 11 depicts an exemplary lithology histogram 246 that may be part of such a statistical analysis, where the different rock types are labeled R1 to R5.
[0050] The merger of the topographic and lithologic classification permits the generation of risk maps for logistic and data quality risks. FIG. 12 is an illustration 250 of the information that may be conveyed by logistic and data risk maps according to some embodiments of the invention. A logistic risk map 252 may indicate regions with risks of limited access or no access for difficult terrain for wheeled vehicles. The no or limited vehicle access risks may be due to escarpments, terrain edges, soft clay and/or sabkha. The risks for wheeled vehicles may be due to hard rough surface rocks.
[0051] A scatter risk map 256, one type of data quality risk map, may indicate regions with risks due to scattering from topographic boundaries due to terrain edges and escarpments; and regions with risks due to scattering from lithologic boundaries due to changes in the surface rock. Another type of data quality risk map is a velocity risk map 260 that may indicate regions with risks attributable to vibrator point loading due to hard and rough surfaces and regions with risks due to high attenuation and risk noise from trapped surface modes due to clay and sabkha.
[0052] FIG. 13 depicts an exemplary work flow 270 for merging the lithographic and topographic maps to produce the logistic risk map 252 in accordance with some embodiments of the invention. As shown in FIG. 13 three bands 274, 276 and 278 are derived from the satellite-acquired multispectral imagery 272. As a non-limiting example, the bands 274, 276 and 278 may be each be associated with a different primary color, such as a primary color that is selected from the red, green and blue primary color set. As described below, the bands 274, 276 and 278 are modified based on topography and lithology analyses for purposes of producing the logistic risk map 252.
[0053] More specifically, for the example that is depicted in FIG. 13 , a clay mask 280 is used to remove selected portions of the first band 274, which correspond to the clay regions to produce a modified first band 282. The escarpment map 169, a hard rock mask 286 and the clay mask 280 are used to remove selected portions of the second band 276, which correspond to the escarpments, hard rock and clay regions, respectively, to produce a modified second band 290. The escarpment map 169 and the hard rock mask 286 are used to spatially remove selected portions of the third band 276, which correspond to escarpment and hard rock regions, respectively, to produce a modified third band 298. Due to this processing, the primary color that its associated with the modified first band 282 indicates the escarpments and hard rock areas in the band 282; the primary color that its associated with the modified second band 290 indicates the areas, which are not associated with escarpments, hard rock areas and clay areas; and the primary color that its associated with the modified third band 298 indicates the clay areas. The work flow 270 involves overlaying the bands 282, 290 and 298 to produce a composite image that forms the logistic risk map 252, in accordance with some embodiments of the invention.
[0054] FIG. 14 generally depicts a work flow 320 for generating the data quality scatter risk map 256 and a data quality velocity risk map 260, in accordance with some embodiments of the invention.
[0055] The data quality scatter risk map 256 indicates features of the surface and near-surface, which pose risks to scattering seismic data. In this regard, the data quality risk map 256 indicates topographic features, such as terrain edges and escarpments; and the data quality risk map 256 indicates lithologic boundaries that represent sharp boundaries between rocks of very different elastic properties, such as sandstone and limestone. Therefore, the generation of the data quality scatter risk map 256 involves combining the escarpment map 169 and lithology boundaries 326, as determined from the lithology classification map 134.
[0056] The data quality velocity risk map 260 considers the risks due to source and receiver data quality aspects. For example, from the source side, for hard rock and rough terrain, a very reduced coupling may occur between the baseplate of the vibrator and the ground. This phenomenon is called point loading, and often results in high distortion of the vibrator sweep signal, which is transmitted into the ground. The risk for point loading of the vibrator baseplate is therefore captured by the hard rock features of the data quality velocity risk map 260.
[0057] As another example of a potential velocity risk, from the receiver side, the near-surface at a receiver may contain very soft surface material, such as clay or sabkha. If clay is deposited in a pan between hard rock layers, surface waves tend to become trapped, which results in ringing noise and consequently high noise levels. Often clay and sabkha also show high attenuation, especially for high frequency seismic signals. Therefore, the risk for trapped modes and high attenuation is captured by the clay features of the data quality velocity risk map 260.
[0058] In accordance with some embodiments of the invention, the generation of the data quality velocity risk map 260 involves combining the escarpment map 169, the hard rock mask 286, the clay mask 280 and a soft rock mask 336.
[0059] The statistical analysis of the logistic and data quality risks may be summarized in a risk assessment table, which is useful for survey design and risk management. Table 350, which is depicted in FIG. 15 , is an example of one such table. Referring to FIG. 15 , for a depression 352 (approximately 10 percent of the terrain for this example) in which the dominant rock is sabkha and sand, there are maneuvering limitations for vehicles, due to the soft ground and potential attenuation reverberations that pose a data quality risk. For the plateaus 354, which constitute 50 percent of the terrain in this example, the dominant rock is sandstone and clay pans, and there is no data quality or logistic risk for these regions. For the rough highlands regions 356, which constitute approximately 40 percent of the terrain for this example, the dominant rock is limestone. The limestone presents a logistic risk due to the potential difficulties and maneuvering vehicles. Furthermore, there is a vibrator point loading risk. The terrain also includes a few escarpments 358, which pose an access limitation logistic risk and a scatter risk for the data quality.
[0060] As another example of another geomorphological feature that may be determined based on remote sensing data, the near-surface geomorphological characterization may be used for purposes of static corrections. Variations in the near surface produce static fluctuations in the corresponding seismic data. Static corrections are therefore needed to compensate for time shifts that are caused by topography variations and variations in the velocity of the seismic waves in the near-surface. The above-described topographic and lithologic classification allows the generation of a three-dimensional (3-D) near surface geologic model, and using standardized elastic properties for the rock types identified in the classification step, the 3-D geological model may be converted into a 3-D elastic model. Statics estimates are made assuming vertical propagation of the seismic waves through the layers of the elastic model.
[0061] Thus, referring to FIG. 16 , a technique 380 that may be used in accordance with some embodiments of the invention includes receiving (block 382) first data that is indicative of an elevation model of a region of interest and receiving (block 384) second data that is indicative of a satellite-acquired spectroscopic image of the region of interest. The technique 380 includes determining (block 386) static corrections based at least in part on the first and second data.
[0062] As a more specific example, FIG. 17 illustrates an exemplary work flow 400 for estimating statics from the digital elevation model 17 and satellite-acquired imagery 18 according to an embodiment of the invention. More specifically, the work flow 400 uses the digital elevation model 17 for topographic characterization and uses the satellite-acquired multispectral imagery 18 for mineral discrimination and surface lithology characterization.
[0063] Referring to FIG. 17 in conjunction with FIG. 1 , the work flow 400 begins with using stratigraphic column data 408 to identify the geologic units and their geologic context. The satellite-acquired multispectal imagery 18 is then used in combination with the stratigraphic column data 408 to generate a surface lithology map 412, which is calibrated with surface geological field data 404. The digital elevation model 17 is combined with the determined surface lithology 412 to generate a 3-D geologic near surface model 420.
[0064] The 3-D geological near surface model 420 may be converted into an initial elastic near-surface model 426 using standardized velocities 424 and elastic parameters for the rocks identified from the satellite-acquired imagery 18. From the model 426, initial statics estimates 428 may be made, and these estimates may be calibrated 432 by using refraction statics 430 from acquired seismic data.
[0065] It is important to note that the spatial density for the statics estimates, which can be achieved by interpreting remote sensing data, is determined only by the resolution of the satellite image. In most cases, short wave infrared satellite imagery has been used for proper mineral discrimination, which defines a limit of around ten meters for the estimation of statics. The core of the technique is the characterization and classification of the surface topography and the near surface lithology. For proper correction of the statics, it is important to understand the geomorphology of the area of the seismic survey, i.e., to understand how the topography is determined by the near surface lithology.
[0066] The geomorphological characterization of the near surface may also be used for purposes of performing tectonic mapping. In this regard, referring to FIG. 18 , in accordance with some embodiments of the invention, a technique 450 includes receiving (block 454) first data that is indicative of a digital elevation model and receiving (block 456) second data that is indicative of a spectroscopic image of the region of interest. A pre-erosion map of the region of interest may then be determined based on the first and second data, as set forth in block 458.
[0067] More particularly, the joint interpretation of digital elevation models and multi-spectral remote sensing data in connection with stratographic and geologic information reveals the geologic structure of the Earth's surface, particularly in desert terrain. The characterization and classification of the digital elevation model 17 using spatial statistics provides hints for formation tops, which are validated by the mineral spectroscopy of multi-spectral remote sensing data. The idea behind this approach is that the topography of the Earth's surface is the result of geological processes such as deposition, erosion and tectonics.
[0068] In accordance with some embodiments of the invention, a technique 480, which is depicted in FIG. 19 , may be used for purposes of developing the pre-erosion map. Pursuant to the technique 480, the digital elevation model is analyzed (block 482) for geomorphologic terrain classes such as tableland and terrain edges and escarpments are extracted using a spatial gradient filter. In hard rock areas, the escarpments often delineate valleys, which follow fault lines. The multispectral satellite images are then combined (block 484) to form a multi-band RGB image, which reveals the different rock types in certain areas. The rocks exposed as outcrops may be associated with their elevation use using the digital elevation model. From the relative elevations, the position sequence may be obtained and hence, a stratographic column. Combined with the tectonic lineaments extracted from the escarpments of the digital elevation model, the tectonic features may be identified. In accordance with some embodiments of the invention, the pre-erosion map may indicate a graben between normal faults, and the throw of the graben may be determined from the map.
[0069] In accordance with embodiments of the invention, interpreted irregularities in the shape of wadi systems may be used to identify active faults. The wadi system may be identified, in accordance with some embodiments of the invention, using a technique that is based on the response of thermal infrared satellite imagery to moisture. More specifically, wadis, which contain slightly higher quantities of moisture than the surrounding terrain, give a “cool” response in the thermal infrared image.
[0070] Referring to FIG. 20 , a technique 490 to identify active faults may proceed as follows. First, the technique includes determining (block 492) a band ratio to detect wadis. The band ratio refers to the ratio of intensities of two bands of the satellite multispectral imagery 18, which are processed according to the determined ratio to produce a band ratio image in which the wadis are highlighted. As a non-limiting example, in accordance with some embodiments of the invention, the band ratio image may be formed from processing pan-chromatic and thermal infrared bands according to a determined ratio of eight for the pan-chromatic band to six for the thermal infrared band. The technique 490 thus, includes based on the band ratio, generating (block 494) the band ratio image, which highlights any wadis. A pattern recognition algorithm is then applied (block 496) to process the band ratio image to extract any straight wadi paths, as a straight wadis path delineates the outcrop of an active fault. As a non-limiting example, a pattern recognition algorithm, such as the “Ant Tracking” algorithm that is available from Schlumberger may be used, in accordance with some embodiments of the invention, for purposes of processing the band ratio image to identify active faults.
[0071] Referring to FIG. 21 , in accordance with some embodiments of the invention, a data processing system 520 includes a processor 550 for purposes of executing at least one program 544 (stored at a memory 540) for purposes of performing one or more of the techniques that are disclosed herein in accordance with embodiments of the invention. The processor 550 may be coupled to a communication interface 560 for purposes of receiving data indicative of remote sensing data. In addition to storing instructions for the program 554, the memory 540 may store preliminary, intermediate and final datasets involved in the techniques that are disclosed herein. Among its other features, the data processing system 520 may include a display interface 570 and display 574 for purposes of displaying the various maps and models that are generated as described herein.
[0072] While the present invention has been described with respect to a limited number of embodiments, those skilled in the art, having the benefit of this disclosure, will appreciate numerous modifications and variations therefrom. It is intended that the appended claims cover all such modifications and variations as fall within the true spirit and scope of this present invention.
Claims
What is claimed is:
1. A method comprising:
receiving first data belonging to a first type of remote sensing data for a region of interest;
receiving second data belonging to a different second type of remote sensing data for the region of interest; and
processing the first and second data in a processor-based machine to determine a risk map for the region of interest based at least in part on the first and second data, wherein the risk map represents a risk of scattering for a geologic survey conducted in the region of interest.
2. The method of claim 1, wherein:
the first data comprises data representing one of the members of a set consisting essentially of an elevation model of the region of interest, satellite-acquired spectroscopic imagery of the region of interest and satellite-acquired radar imagery of the region of interest, and
the second data comprises data representing another one of the members of the set.
3. The method of claim 1, wherein:
the first data comprises data representing an elevation model of the region of interest, and
the second data comprises data representing a satellite-acquired spectroscopic image of the region of interest.
4. The method of claim 1, wherein the risk map further represents logistical risks for the survey.
5. The method of claim 1, wherein processing the first and second data to determine the risk map comprises:
determining topography features of the region of interest based on the first data; and
determining lithology features of the region of interest based on the second data.
6. The method of claim 5, wherein the act of determining the topography features comprises:
determining a histogram of the elevations of the region of interest;
determining a hypsographic curve based on the histogram; and
determining a classification map of the topography of the region of interest based on the hypsographic curve.
7. The method of claim 5, wherein the act of determining the topography features comprises:
determining locations of escarpments based on a multi-azimuth edge detection algorithm.
8. The method of claim 5, wherein the act of determining the lithology features comprises:
analyzing color bands of the satellite-acquired spectroscopic imagery.
9. The method of claim 8, wherein the act of analyzing the color bands comprises:
for each mineral of a predetermined group of minerals, determining a band ratio mask and applying the band ratio mask to generate a map of the mineral in the region of interest.
10. The method of claim 5, wherein
the act of determining the topography features comprises determining an escarpment map,
the act of determining the lithology features comprises determining a hard rock mask and determining a clay mask, and
processing the first and second data to determine the risk map comprises generating a lithology risk map based on the escarpment map, the hard rock mask and the clay mask.
11. The method of claim 5, wherein
the act of determining the topography features comprises determining an escarpment map,
the act of determining the lithology features comprises determining a lithology boundary map, and
processing the first and second data to determine the risk map comprises generating a data quality scatter risk map based on the escarpment map and the lithology boundary.
12. The method of claim 5, wherein
the act of determining the topography features comprises determining an escarpment map,
the act of determining the lithology features comprises determining a hard rock map, a clay mask map and a soft rock mask map, and
processing the first and second data to determine the risk map comprises generating a data quality scatter risk map based on the escarpment map, the hard rock map, the clay mask map and the soft rock mask map.
13. The method of claim 1, wherein
the scattering comprises lithologic scattering or topographic scattering.
14. The method of claim 1, wherein
the risk map further represents a risk of vibrator point loading in connection with the survey.
15. The method of claim 1, wherein
the risk map further indicates a risk for vehicle access in the region of interest.
16. The method of claim 1, further comprising
determining static corrections based at least in part on the first and second data.
17. The method of claim 16, wherein the act of determining the static corrections comprises determining a geologic near surface model for the region of interest based at least in part on the first and second data.
18. The method of claim 17, wherein the act of determining the static corrections further comprises determining an elastic near surface model for the region of interest based at least in part on the geologic near surface model.
19. The method of claim 18, wherein the act of determining the static corrections further comprises calibrating the elastic near surface model based on refraction static estimates based on near surface seismic data acquired in a seismic survey.
20. The method of claim 1, wherein
the first data comprises data representing an elevation model of the region of interest,
the second data comprises data representing a satellite-acquired spectroscopic image of the region of interest, and
processing the first and second data comprises determining a pre-erosion map of the region of interest.
21. The method of claim 20 wherein the act of determining the pre-erosion map comprises:
applying a spatial gradient filter to extract terrain edges and escarpments from the elevation model to produce a filtered image; and
generating the pre-erosion map based on the filtered image and the multispectral imagery.
22. The method of claim 21, further comprising:
identifying a graben fault in the pre-erosion map; and
based on the pre-erosion map determining a throw of the graben fault.
23. A system comprising:
an interface to receive first data belonging to a first type of remote sensing data for a region of interest and receive second data belonging to a different second type of remote sensing data for the region of interest; and
a processor to determine a risk map for the region of interest based at least in part on the first and second data, the risk map representing a risk of scattering for a geologic survey conducted in the region of interest.
24. The system of claim 23, wherein
the first data comprises data representing one of the members of a set consisting essentially of an elevation model of the region of interest, satellite-acquired spectroscopic imagery of the region of interest and satellite-acquired radar imagery of the region of interest, and
the second data comprises data indicative of another one of the members of the set.
25. The system of claim 23, wherein
the first data comprises data representing an elevation model of the region of interest, and
the second data comprises data indicative of a satellite-acquired spectroscopic image of the region of interest.
26. The system of claim 23, wherein the risk map further represents logistical risks for the survey.
27. The system of claim 23, wherein the processor is adapted to:
determine topography features of the region of interest based on the first data;
determine lithology features of the region of interest based on the second data; and
combine the determined topography and lithology features to generate the risk map.
28. The system of claim 23, wherein the processor is adapted to:
determine a histogram of the elevations of the region of interest;
determine a hypsographic curve based on the histogram; and
determine a classification map of the topography of the region of interest based on the hypsographic curve.
29. The system of claim 23, wherein the processor is adapted to:
determine locations of escarpments based on a multi-azimuth edge detection algorithm.
30. The system of claim 23, wherein at least one of the first and second data represents
color bands of the satellite-acquired spectroscopic imagery, and the processor is adapted to analyze color bands of the satellite-acquired spectroscopic imagery.
31. The system of claim 30, wherein the processor is adapted to use the analysis of the color bands to, for each mineral of a predetermined group of minerals, determine a band ratio mask and apply the band ratio mask to generate a map of the mineral in the region of interest.
32. The system of claim 23, wherein the processor is adapted to:
determine an escarpment map;
determine a hard rock mask;
determine a clay mask; and
generate a lithology risk map based on the escarpment map, the hard rock mask and the clay mask.
33. The system of claim 23, wherein the processor is adapted to:
determine an escarpment map;
determine a lithology boundary map; and
generate a data quality scatter risk map based on the escarpment map and the lithology boundary map.
34. The system of claim 23, wherein the processor is adapted to:
determine an escarpment map,
determine a hard rock map;
determine a clay mask map;
determine a soft rock mask map, and
generate a data quality velocity risk map based on the escarpment map, the hard rock map, the clay mask map and the soft rock mask map.
35. The system of claim 23, wherein:
the risk map represents of a risk of lithologic scattering or-topographic scattering.
36. The system of claim 23, wherein:
the risk map further represents a risk of vibrator point loading in connection with the survey.
37. The system of claim 23, wherein:
the risk map further represents a risk of noise from trapped surface modes in connection with a seismic survey conducted in the region of interest.
38. The system of claim 23, wherein:
the risk map further represents a risk for vehicle access in the region of interest.
39. The system of claim 23, wherein:
the first data comprises data representing an elevation model of the region of interest,
the second data comprises data representing satellite-acquired multispectral imagery of the region of interest, and
the processor is adapted to determine static corrections based at least in part on the first and second data.
40. The system of claim 23, wherein the processor is adapted to determine a geologic near surface model for the region of interest based at least in part on the first and second data.
41. The system of claim 40, wherein the processor is adapted to determine an elastic near surface model for the region of interest based at least in part on the geologic near surface model.
42. The system of claim 41, wherein the processor is adapted to calibrate the elastic near surface model based on refraction static estimates based on near surface seismic data acquired in a seismic survey.
43. The system of claim 23, wherein:
the first data comprises data representing an elevation model of the region of interest,
the second data comprises data representing a satellite-acquired spectroscopic image of the region of interest, and
the processor is adapted to determine a pre-erosion map of the region of interest.
44. The system of claim 43, wherein the processor is adapted to:
apply a spatial gradient filter to extract terrain edges and escarpments from the elevation model to produce a filtered image; and
combine the filtered image with the satellite-acquired multispectral imagery to generate the pre-erosion map.
45. The system of claim 44, wherein the processor is adapted to identify a graben fault in the pre-erosion map and based on the pre-erosion map, determine a throw of the graben fault.
46. A method comprising:
receiving first data representing different bands of satellite acquired multispectral imagery;
processing the first data in a processor-based machine to generate second data representing a band ratio image;
identifying wadis based at the band ratio image; and
applying a pattern tracking algorithm to identify at least one path formed by the wadis to identify an active fault.
47. The method of claim 46, wherein the act of processing the first data comprises:
processing data indicative of pan-chromatic and thermal infrared bands such that the band ratio image is formed from a ratio of the pan-chromatic and thermal infrared bands.
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