Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Earth science
Reexamination Certificate
2002-04-25
2004-07-06
Hoff, Marc S. (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Earth science
C702S018000
Reexamination Certificate
active
06760667
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates generally to processing seismic trace data, and more specifically to methods for processing P—P seismic trace data so as to generate P-S or S—S seismic data or attributes in P—P, P-S or S—S travel times or depth.
Existing methods for processing P—P data result in P—P amplitudes in P—P travel time. In addition, P—P data has proved to be limited in addressing certain exploration/exploitation problems.
SUMMARY OF THE INVENTION
According to one embodiment of the present disclosure, a method for generating P-S and/or S—S seismic data from P—P AVO (amplitude variation with offset) data is disclosed. The method generates P-S and/or S—S seismic data from P—P AVO data in at least one of P—P, P-S, or S—S travel times. Using multiple seismic data types to analyze a hydrocarbon prospect has advantages over using P—P data alone. It is noted that the acquisition and processing of traditional P-S or S—S data is more expensive, time consuming and complicated than acquiring and processing P—P data alone. However, according to one embodiment of the present disclosure, by generating P-S or S—S data from P—P data, it is possible to determine if a hydrocarbon prospect is highlighted using a particular type of data (i.e., P-S or S—S) without the expense and time required to acquire and process the traditional P-S or S—S data. Furthermore, the P-S and or S—S data generated from the P—P AVO data allows a robust method of aligning P—P data with at least one of P-S or S—S data.
A technical advantage of the embodiments of the present disclosure is the leveraging of a combination of P—P and P-S and/or S—S data necessary to address and solve certain exploration/exploitation problems.
BRIEF DESCRIPTION OF THE DRAWINGS
The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.
FIG. 1
illustrates a P—P amplitude response for a low impedance pay sand with an average cap rock;
FIG. 2
illustrates a P-S AVO response for a low impedance pay sand with an average cap rock, using the same rock properties as shown in
FIG. 1
;
FIG. 3
shows a traditional P—P seismic section in P—P travel time;
FIG. 4
shows a P-S Zs contrast section calculated from a P—P AVO inversion according to one embodiment of the present disclosure;
FIG. 5
shows a P—P seismic amplitude section and a P—P synthetic in P—P travel time;
FIG. 6
shows a P-S Zs contrast section calculated from a P—P AVO inversion according to another embodiment of the present disclosure and a P-S synthetic in P—P travel time;
FIG. 7
shows a P—P amplitude section;
FIG. 8
shows a P-S Zs contrast section calculated from P—P AVO inversion according to another embodiment of the present disclosure;
FIG. 9
shows another P—P amplitude section; and
FIG. 10
shows a P-S Zs contrast section calculated from P—P AVO inversion according to another embodiment of the present disclosure.
FIGS. 11A
,
11
B,
11
C and
11
D provide a schematic flow diagrams for a process according to an embodiment the present invention.
REFERENCES:
patent: 5999486 (1999-12-01), DeVault
patent: 6058074 (2000-05-01), Swan et al.
patent: 6091669 (2000-07-01), Chen
patent: 6243650 (2001-06-01), Skidmore et al.
patent: 6263284 (2001-07-01), Crider et al.
patent: 6421611 (2002-07-01), Kelly et al.
patent: 6529833 (2003-03-01), Fanini et al.
patent: 2002/0013661 (2002-01-01), Van Riel et al.
patent: 2003/0018435 (2003-01-01), Jenner et al.
Xiang-Yang Li, Hengchang Dai, Michael C. Mueller and Olav I. Barkved in “Compensating for the effects of gas clouds on C-wave imaging: A case study from Valhall” published inThe Leading Edge, Sep. 2001, pp. 1022-1028.
Folke Engelmark, in “Using converted shear waves to image reservoirs with low-impedance contrast” publishedThe Leading Edge, Jun. 2000, pp. 600-603.
Kelly Michael C.
Skidmore Charles M.
Emerald Geoscience Research Corporation
Gutierrez Anthony
Hoff Marc S.
Montgomery John W.
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