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Not applicable.
1. Field of the Invention
The presently invention pertains to seismic data interpretation and, more particularly, with respect to near-surface geological structures.
2. Description of the Related Art
This section of this document introduces various aspects of the art that may be related to various aspects of the present invention described and/or claimed below. It provides background information to facilitate a better understanding of the various aspects of the present invention. As the section's title implies, this is a discussion of “related” art. That such art is related in no way implies that it is also “prior” art. The related art may or may not be prior art. The discussion in this section of this document is to be read in this light, and not as admissions of prior art.
Much effort is expended in locating, evaluating, and exploiting hydrocarbon deposits, e.g., oil and natural gas, trapped in subterranean geological formations. The exercise of examining subterranean geological formations for deposits of hydrocarbon deposits is known as “seismic surveying” or, sometimes, “geophysical surveying”. It is highly desirable to locate hydrocarbon deposits in reservoirs in the subsurface from which liquid or gas can be extracted or into which liquid or gas can be injected.
A seismic 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 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 (geophones), and industrial surveys may deploy only one type of sensors or both. In response to the detected waves, 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.
The correlation of surface geomorphology with subsurface geology is well known. Huggett, R. J. Fundamentals of Geomorphology (2nd ed., Routledge Fundamentals of Physical Geography, Routledge, London 2007). Shallow geologic formations, or “near-surface geological structures”, are therefore of interest. Those in the art will appreciate that the term “near-surface” is a term of art commonly used and well understood in the art. They can therefore identify those geological structures that are “near-surface” and those that are not.
Near-surface geological structures present particular problems not encountered with deeper formations. Mapping near-surface geological structures with seismic data acquired by state-of-the-art receiver arrays is often compromised by noise resulting from near-offset source noise and seismic near-field effects up to the degree that the data cannot be used for shallow structural mapping at all. In cases where the data is noisy but usable, conventional techniques addressing this problem using a variety of processing techniques that remove noise from the data prior to interpreting the data. However, the industry continues to seek better approaches to this problem.
The present invention is directed to resolving, or at least reducing, one or all of the problems mentioned above.
The present invention includes a computer implemented technique for use in seismic data interpretation and, more particularly, with respect to near-surface geological structures. In a first aspect, the technique includes a computer-implemented method, comprising: jointly interpreting a plurality of complementary data sets describing different attributes of a near-surface geologic structure; and ascertaining a near-surface geomorphology from the joint interpretation. In another aspect, the technique includes a program storage medium encoded with instructions that, when executed, perform such a method. In yet another aspect, the method includes a computing apparatus programmed to perform such a method.
The above presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. This summary is not an exhaustive overview of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.
The invention may be understood by reference to the following description taken in conjunction with the accompanying drawings, in which like reference numerals identify like elements, and in which:
While the invention is susceptible to various modifications and alternative forms, the drawings illustrate specific embodiments herein described in detail by way of example. It should be understood, however, that the description herein of specific embodiments is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
One or more specific embodiments of the present invention will be described below. It is specifically intended that the present invention not be limited to the embodiments and illustrations contained herein, but include modified forms of those embodiments including portions of the embodiments and combinations of elements of different embodiments as come within the scope of the following claims. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business related constraints, which may vary from one implementation to another. Moreover, it should be appreciated that such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure. Nothing in this application is considered critical or essential to the present invention unless explicitly indicated as being “critical” or “essential.”
The mapping of near-surface geological structure and the drilling risks resulting from it are a challenge that requires a combination of techniques, because state-of-the-art seismic using receiver arrays does not provide sufficient data quality to interpret the data for geology. The presently disclosed technique jointly interprets complementary data sets that describe different attributes of the same near-surface geologic structures. When interpreted jointly, one can then ascertaining a near-surface geomorphology from the joint interpretation
More particularly, in the illustrative embodiment, the presently disclosed technique integrates fault outcrop mapping using satellite image interpretation with seismic near-surface characterization techniques from Rayleigh wave and refraction velocity mapping. The interpretation of satellite images and digital elevation models yields a model of the surface geomorphology, which can be studied for anomalies.
Linear anomalies are associated with fault outcrops, whereas areal anomalies are interpreted as possible imprint of subsurface geological structure. The interpretation of a Rayleigh wave and P-wave velocity cube extracted from a point receiver seismic cube, as in the embodiments illustrated below, allows the extraction of iso-velocity surfaces, which can be studied for anomalies, too. Linear anomalies such as local sudden drop in velocity are associated with near-surface faults whereas local highs of the iso-velocity surfaces are interpreted as near-surface imprint of deeper reservoir structures.
The combination of three different methods, remote sensing and P-wave and S-wave seismic, meets the overarching goal of extracting complementary data sets, which describe different attributes of the same near-surface geologic structures. Remote sensing provides dense spatial mapping of minerals and geologic structures, but it lacks penetration into the subsurface. Seismic data provide elastic information about the structures in the near-surface, but need to be converted into geologically meaningful data on one hand and spatially sparse data on the other hand. The integration of the three data types optimizes the geological description of the near-surface through compensating the weaknesses in one data type by the strength in another data set.
The present invention will now be described with reference to the attached drawings. Various structures, systems and devices are schematically depicted in the drawings for purposes of explanation only and so as to not obscure the present invention with details that are well known to those skilled in the art. Nevertheless, the attached drawings are included to describe and explain illustrative examples of the present invention.
This presently disclosed technique includes, in one particular aspect, a computer-implemented method for mapping shallow geological structure and related drilling risks through full integration of surface and subsurface geophysical data with remote sensing data. As is illustrated in
The computer-implemented method 100 of
The storage 210 is encoded with a plurality of complementary data sets 225-227 describing different attributes of a near-surface geologic structure. The seismic data sets 225-227 are acquired in a manner specific to the type of data but in a manner that will be apparent to those skilled in the art having the benefit of this disclosure. Typically, the data will have been previously acquired in both time and place, and it may therefore be what is known as “legacy” data in some embodiments.
The storage 210 is also encoded with an operating system 230, user interface software 235, and an application 265. The user interface software 235, in conjunction with a display 240, implements a user interface 245. The user interface 245 may include peripheral I/O devices such as a keypad or keyboard 250, a mouse 255, or a joystick 260. The processor 205 runs under the control of the operating system 230, which may be practically any operating system known to the art. The application 265 is invoked by the operating system 230 upon power up, reset, or both, depending on the implementation of the operating system 230. The application 265, when invoked, performs the method of the present invention. The user also may invoke the application in conventional fashion through the user interface 245.
Those in the art will appreciate that the data sets comprise sets of ordered data physically manifested as digital patterns of electromagnetic bits coded on an underlying program storage medium of some kind. The data may be rendered in some particular manner. For example, it may be rendered for human perception either through display or printing. The data is shown rendered for human perception throughout this disclosure, but there is no requirement that such be the case. Some embodiments may process the data without ever rendering it.
Note that there is no need for the data sets 225-227 to reside on the same computing apparatus 200 as the application 265 by which they are processed. Some embodiments of the present invention may therefore be implemented on a computing system, e.g., the computing system 300 in
However, there is no requirement that the computing system 300 be networked. Alternative embodiments may employ, for instance, a peer-to-peer architecture or some hybrid of a peer-to-peer and client/server architecture. The size and geographic scope of the computing system 300 is not material to the practice of the invention. The size and scope may range anywhere from just a few machines of a Local Area Network (“LAN”) located in the same room to many hundreds or thousands of machines globally distributed in an enterprise computing system.
As is apparent from this discussion, some portions of the detailed descriptions herein presented in terms of a software implemented process involving symbolic representations of operations on data bits within a memory in a computing system or a computing device. These descriptions and representations are the means used by those in the art to most effectively convey the substance of their work to others skilled in the art. The process and operation require physical manipulations of physical quantities that will physically transform the particular machine or system on which the manipulations are performed or on which the results are stored. Usually, though not necessarily, these quantities take the form of electrical, magnetic, or optical signals capable of being stored, transferred, combined, compared, and otherwise manipulated. It has proven convenient at times, principally for reasons of common usage, to refer to these signals as bits, values, elements, symbols, characters, terms, numbers, or the like.
It should be borne in mind, however, that all of these and similar terms are to be associated with the appropriate physical quantities and are merely convenient labels applied to these quantities. Unless specifically stated or otherwise as may be apparent, throughout the present disclosure, these descriptions refer to the action and processes of an electronic device, that manipulates and transforms data represented as physical (electronic, magnetic, or optical) quantities within some electronic device's storage into other data similarly represented as physical quantities within the storage, or in transmission or display devices. Exemplary of the terms denoting such a description are, without limitation, the terms “processing,” “computing,” “calculating,” “determining,” “displaying,” and the like.
Furthermore, the execution of the software's functionality transforms the computing apparatus on which it is performed. For example, acquisition of data will physically alter the content of the storage, as will subsequent processing of that data. The physical alteration is a “physical transformation” in that it changes the physical state of the storage for the computing apparatus.
Note also that the software implemented aspects of the invention are typically encoded on some form of program storage medium or implemented over some type of transmission medium. The program storage medium may be magnetic (e.g., a floppy disk or a hard drive) or optical (e.g., a compact disk read only memory, or “CD ROM”), and may be read only or random access. Similarly, the transmission medium may be twisted wire pairs, coaxial cable, optical fiber, or some other suitable transmission medium known to the art. The invention is not limited by these aspects of any given implementation.
Returning now to
Turning now to the extraction (at 410,
The integration of remote sensing with geology and geophysics was then demonstrated in Laake, A., Al-Alawi, H. and Gras, R., “Integration of Remote Sensing Data with Geology and Geophysics—Case Study from Bahrain”, GEO (2006). Finally, remote sensing data were used in the generation of a near-surface geologic model in Laake, A., & Cutts, A., “The Role of Remote Sensing Data in Near-Surface Seismic Characterization”, 25(2) First Break 51-55 (2007); Laake, A., et al., “Integrated Approach to 3D Near Surface Characterization in Desert Regions”, 26 First Break 109-112 (2008); and Laake, A., et al., “Geomorphology—Understanding the Near-Surface Impact on Seismic Data”, presented at EAGE workshop, 71st EAGE Conference and Exhibition, Amsterdam, The Netherlands, 8-11 (June 2009).
The geological interpretation of remote sensing data is based on the extraction of geomorphologic information using the digital elevation model and its spatial gradient, the slope as well as spatial and spectral processing of the satellite imagery as described in, for example: Sabins, F., Remote Sensing, Principle and Interpretation (W.H. Freeman & Co, New York. N.Y. 3rd Ed. 1996); Laake, A., et al., “Integrated Approach to 3D Near Surface Characterization in Desert Regions”, 26 First Break 109-112 (2008); Laake, A., et al., “Geomorphology—Understanding the Near-Surface Impact on Seismic Data”, presented at EAGE workshop, 71st EAGE Conference and Exhibition, Amsterdam, The Netherlands, 8-11 (June 2009); and Laake, A., et al., “Discovery of hidden treasures: Surface-subsurface integration reveals faults in Gulf of Suez Oilfields”, Schlumberger Reservoir Symposium 2009, Boston (Oct. 20-22, 2009).
Spatial anomalies in the geomorphology are identified as either linear and interpreted as fault outcrops or as spatial and interpreted as possible reservoir structural imprint at the surface.
Linear geomorphologic anomalies 530 are then characterized from the slope 515 and the heterogeneities 520, 525. Fault outcrops 535 are then identified from the linear geomorphologic anomalies 530. Spatial geomorphologic anomalies 540 are characterized from the digital elevation model 505 and the heterogeneities 525 obtained from mineral discrimination. The imprint 545 of the reservoir structure or another subsurface geologic structure is then identified from the spatial geomorphologic anomalies. Thus, from the digital elevation model 505 and the satellite imagery 510 this aspect of the technique identifies the fault outcrops 535 and the reservoir structure imprint 545 in the geographic area of interest.
One method 600, conceptually illustrated in
In the high discrimination mineral image 720, which results from the difference between two cross-band red-green-blue (“RGB”) images (for example, 675-432), subtle changes in the mineral composition of the pebbles deposited by the wadis 712 reveal lineaments and structural features. Wadi courses can also be studied using the band ratio of the pan-chromatic band 8 and the thermal infrared band 6, which detects thermally cooler areas associated with higher moisture contents along the wadi courses, as shown in the image 430. Anomalies in the wadi courses are interpreted as outcrops of faults leading to shifts in the surface geological layers relative to each other.
One suitable technique for extracting structural geologic information from remote sensing data is disclosed and claimed in U.S. patent application Ser. No. 12/568,322, filed Sep. 28, 2009, and incorporated by reference below. However, other suitable techniques may be employed in alternative embodiments.
Turning now to extracting (at 420,
However, the propagation properties of surface waves depend on the elastic properties of the near surface. Moreover, since the propagation properties are closely related to the near surface elastic parameters, the analysis of surface wave allows the near surface characterization. The presently disclosed technique leverages these facts and employs them to a beneficial end.
The approach used herein consists of the integration of the surface wave method in the general data processing workflow for 3D data. The analysis stage involves creating first a smooth spatial distribution of the propagation properties and then a detailed high-resolution image of the dispersive and dissipative properties of the surface wave modes. These data are inverted, considering a priori information and constraints, and merged in an unique 3D near-surface model. The surface wave results can be used to support refraction statics and shallow velocity model building. The inferred surface wave properties are used to design and optimize the filtering workflow, and can be used for local adaptive filters.
The surface wave method of the illustrated embodiment for the near surface characterization is a two step process 800, illustrated in
The dispersion curve is extracted tracking energy maxima in 2D wavefield transforms, in which the energy is mapped from the T-X domain into the F-K domain. The spatial distribution of the surface wave velocity can be plotted as a pseudo section 930. The pseudo section 930 is a 2D image of the properties in which the horizontal axis represents the position along a line of receivers (or sources) and the vertical axis represent a propagation parameter related to the depth. The wavelength can be used for this purpose.
One suitable technique for extracting structural geological information from Rayleigh wave data is disclosed and claimed in U.S. patent application Ser. No. 12/620,941, filed Sep. 18, 2009, and incorporated by reference below. However, other suitable techniques may be employed in alternative embodiments.
Turning now to extracting (at 430,
One suitable technique for extracting structural geological information from short offset refractions is disclosed and claimed in U.S. patent application Ser. No. 11/960,176, filed Dec. 19, 2007, and incorporated by reference below. However, other suitable techniques may be employed in alternative embodiments.
The illustrated embodiment extends the elastic mapping from Rayleigh waves and short offset refractions into 3D. The results are shown as RGB maps 1000, 1010 in
The joint interpretation of remote sensing data and shallow seismic data from short offset refractions and Rayleigh waves is directed towards two principal targets: lineaments, which represent fault zones, and areal structures, which represent the shallow geological structure, which in turn may yield some correlation with the reservoir structure. The workflow for both targets starts with the analysis of the remote sensing data, because they provide dense spatial coverage at higher resolution than the seismic data. The analysis of the remote sensing data establishes possible anomalies which are validated by the results from the shallow seismic data.
One suitable technique for joint interpretation of data suitable for use with the present invention is disclosed and claimed in U.S. patent application Ser. No. 12/124,218, filed May 21, 2008, and incorporated by reference below. However, other suitable techniques may be employed in alternative embodiments.
Thus, the illustrated embodiment of the presently disclose technique is broadly illustrated in
From the geomorphology anomalies (at 1118) and the velocity anomalies (at 1133), the workflow (at 1100 identifies the structure (at 1136), or areal anomalies, and the faults (at 1139), or linear anomalies. The surface-near surface geomorphology (at 1142) as then determined from the structure (at 1136) and the fault zone drilling risk (at 1145) from the faults (at 1139). This information can be used in a variety of ways, some of which will now be discussed.
Those in the art having the benefit of this disclosure will appreciate that the presently disclosed technique will have a number of valuable applications in the interpretation of seismic data with respect to near-surface formations. Two such are illustrated below. First,
A validated fault zone 1260 is then located using the possible fault zone 1250 and the topographical lows 1240, 1245 obtained from the refraction horizon 1225 and the iso-velocity horizon 1230, respectively. The horizon gradient 1255, in conjunction with the validated fault zone 1260, is then used to determine a fault zone orientation 1265, from which a map 1270 of fault related drilling risk can be developed.
Turning now to
A possible imprint 1350 is then identified from the topographical high 1335 in the surface geomorphology 1320. A shallow geological structure 1355 is then developed from the topographical highs 1340, 1335 derived from the refraction horizon 1325 and iso-velocity horizon 1330, respectively. Finally, a validated imprint 1360 is obtained from the possible imprint 1305, and the shallow geological structure 1355.
The above description contemplates that the data has previously been acquired, although the invention is not so limited. The remotely sensed data in the illustrated embodiment is satellite imagery. Such satellite imagery is widely available from both private and governmental sources. The seismic data in the illustrated embodiments is point receiver seismic data, i.e., seismic data collected using point receiver technology. One technology suitable for such acquisition is the Q-Technology® available from WesternGeco, LLC, the assignee hereof. Note, however, that the invention is so limited. Other types of seismic data, such as seismic data acquired using arrays, may be used in alternative embodiments.
With the technology integration proposed herein, it is shown for the first time that near-surface structural geological imaging can be achieved, which allows drawing near-surface drilling risk maps. One can generate a near-surface elastic model to assist data processing. Furthermore, one can apply this technique to separately generate geological and drilling services. This integration yields a process that directly provides a geological result rather than simply improving the seismic data as is the case in conventional practice.
The words and phrases used herein should be understood and interpreted to have a meaning consistent with the understanding of those words and phrases by those skilled in the relevant art. No special definition of a term or phrase, i.e., a definition that is different from the ordinary and customary meaning as understood by those skilled in the art, is intended to be implied by consistent usage of the term or phrase herein. To the extent that a term or phrase is intended to have a special meaning, i.e., a meaning other than that understood by skilled artisans, such a special definition will be expressly set forth in the specification in a definitional manner that directly and unequivocally provides the special definition for the term or phrase.
Furthermore, the phrase “capable of” as used herein is a recognition of the fact that some functions described for the various parts of the disclosed apparatus are performed only when the apparatus is powered and/or in operation. Those in the art having the benefit of this disclosure will appreciate that the embodiments illustrated herein include a number of electronic or electro-mechanical parts that, to operate, require electrical power. Even when provided with power, some functions described herein only occur when in operation. Thus, at times, some embodiments of the apparatus of the invention are “capable of” performing the recited functions even when they are not actually performing them-—i.e., when there is no power or when they are powered but not in operation.
The following are hereby incorporated by reference for the purposes discussed above as if expressly set forth verbatim herein:
This concludes the detailed description. The particular embodiments disclosed above are illustrative only, as the invention may be modified and practiced in different but equivalent manners apparent to those skilled in the art having the benefit of the teachings herein. Furthermore, no limitations are intended to the details of construction or design herein shown, other than as described in the claims below. It is therefore evident that the particular embodiments disclosed above may be altered or modified and all such variations are considered within the scope and spirit of the invention. Accordingly, the protection sought herein is as set forth in the claims below.
This application claims priority to U.S. Provisional Patent Application No. 61/249,618 filed on 8 Oct. 2009 and entitled “Joint Interpretation of Rayleigh Waves and Remote Sensing for Near-Surface Geology”, the content of which is hereby incorporated by reference.
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6 of 15—Short, Sr., N. M., and Blair, Jr., R. W., (eds.) Geomorphology from Space, NASA, 1986, URL: http://geoinfo.amu.edu.pl/wpk/geos/GEO—COMPLETE—TOC.html—4. Fluvial Landforms (87 pages). |
7 of 15—Short, Sr., N. M., and Blair, Jr., R. W., (eds.) Geomorphology from Space, NASA, 1986, URL: http://geoinfo.amu.edu.pl/wpk/geos/GEO—COMPLETE—TOC.html—5. Deltaic Landforms (53 pages). |
8 of 15—Short, Sr., N. M., and Blair, Jr., R. W., (eds.) Geomorphology from Space, NASA, 1986, URL: http://geoinfo.amu.edu.pl/wpk/geos/GEO—COMPLETE—TOC.html—6. Coastal Landforms (75 pages). |
9 of 15—Short, Sr., N. M., and Blair, Jr., R. W., (eds.) Geomorphology from Space, NASA, 1986, URL: http://geoinfo.amu.edu.pl/wpk/geos/GEO—COMPLETE—TOC.html—7. Karst Landforms and Lakes (56 pages). |
10 of 15—Short, Sr., N. M., and Blair, Jr., R. W., (eds.) Geomorphology from Space, NASA, 1986, URL: http://geoinfo.amu.edu.pl/wpk/geos/GEO—COMPLETE—TOC.html—8. Eolian Landforms (99 pages). |
11 of 15—Short, Sr., N. M., and Blair, Jr., R. W., (eds.) Geomorphology from Space, NASA, 1986, URL: http://geoinfo.amu.edu.pl/wpk/geos/GEO—COMPLETE—TOC.html—9. Glaciers and Glacial Landforms (105 pages). |
12 of 15—Short, Sr., N. M., and Blair, Jr., R. W., (eds.) Geomorphology from Space, NASA, 1986, URL: http://geoinfo.amu.edu.pl/wpk/geos/GEO—COMPLETE—TOC.html—10. Planetary Landforms (52 pages). |
13 of 15—Short, Sr., N. M., and Blair, Jr., R. W., (eds.) Geomorphology from Space, NASA, 1986, URL: http://geoinfo.amu.edu.pl/wpk/geos/GEO—COMPLETE—TOC.html—11. Geomorphological Mapping (22 pages). |
14 of 15—Short, Sr., N. M., and Blair, Jr., R. W., (eds.) Geomorphology from Space, NASA, 1986, URL: http://geoinfo.amu.edu.pl/wpk/geos/GEO—COMPLETE—TOC.html—12. Global Geomorphology: Outlook for the Future (19 pages). |
15 of 15—Short, Sr., N. M., and Blair, Jr., R. W., (eds.) Geomorphology from Space, NASA, 1986, URL: http://geoinfo.amu.edu.pl/wpk/geos/GEO—COMPLETE—TOC.html—Epilogue, Appendix, and Index (54 pages). |
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Number | Date | Country | |
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20110085418 A1 | Apr 2011 | US |
Number | Date | Country | |
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61249618 | Oct 2009 | US |