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US5128899A
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Method for sharpening prestack depth migration images by removing residual moveout from common image point gathers before stacking
Assignee: ConocoPhillips Co
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Filing: 1991-07-16
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Granted: 1992-07-07
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Expires: 2011-07-16
Abstract
Abstract A method for removing residual moveout includes sorting the results of common offset depth migration into common image point gathers. A subset of image point gathers are selected for analysis. Each common image point gather is separated vertically into windows, each of which centers on a strong event. For each window, all the offset traces are summed to produce a brute stack trace to be used as an anchor. All offsets are cross-correlated to the anchor to determine how much each trace window should be shifted to sum most constructively with the anchor. A set of dynamic shifts is produced, which when applied, will remove the residual moveouts and produce a truly flat image for stacking. These shifts vary with depth and offset and can be interpolated between the selected image point gathers.
Inventors
- 👤 Mark Boyd
- 👤 Shein S. Wang
- 👤 James M. Tippett
- 👤 Douglas W. Hanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:32
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/28; G01V1/36; G01V1/362; G01V2210/00; G01V2210/50; G01V2210/52
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
120 words
A method for removing non-hyperbolic residual moveout comprising the steps of: receiving seismic data; common offset depth migrating said seismic data; sorting said common offset depth migrated data into common image point gathers; selecting a subset of common image point gathers; separating each common image point gather vertically into windows; summing all the offsets of the depth image for each window to produce a brute stack trace to be used as an anchor; cross-correlating all offsets to the anchor; determining how much each trace should be shifted to sum most constructively with said anchor; recording said shifts for each window and offset; and interpolating said shifts for applying to a whole seismic line wherein said non-hyperbolic residual moveout is removed.
Claim 2
Independent Claim
120 words
A method for removing non-hyperbolic residual moveout comprising the steps of: receiving seismic data; common offset depth migrating said seismic data; sorting said common offset depth migrated data into common image point gathers; selecting a subset of common image point gathers; separating each common image point gather vertically into windows; summing all the offsets of the depth image for each window to produce a brute stack trace to be used as an anchor; cross-correlating all offsets to the anchor; determining how much each trace should be shifted to sum most constructively with said anchor; recording said shifts for each window and offset; and interpolating said shifts for applying to a whole seismic line wherein said non-hyperbolic residual moveout is removed.
Claim 3
Dependent Claim
20 words
The method according to claim 1 wherein said separating step includes the step of: selecting a predetermined number of windows.
Claim 4
Dependent Claim
21 words
The method according to claim 1 wherein said determining step includes the step of: limiting said shift to a preselected distance.
Claim 5
Independent Claim
142 words
An apparatus for removing non-hyperbolic residual moveout comprising: accepting means for receiving seismic data; migration means for common offset depth migrating said seismic data; means for sorting said common offset depth migrated data into common image point gathers; means for selecting a subset of common image point gathers; means for separating each image point gather vertically into windows; combining means for summing all the offsets of the depth image for each window to produce a brute stack trace to be used as an anchor; means for cross-correlating all offsets to the anchor; determining means determining how much each trace should be shifted to sum most constructively with said anchor; means for recording said shifts for each window of each image point gather; and means for interpolating said shifts for apply to a whole seismic line wherein said non-hyperbolic residual moveout is removed.
Claim 6
Independent Claim
142 words
An apparatus for removing non-hyperbolic residual moveout comprising: accepting means for receiving seismic data; migration means for common offset depth migrating said seismic data; means for sorting said common offset depth migrated data into common image point gathers; means for selecting a subset of common image point gathers; means for separating each image point gather vertically into windows; combining means for summing all the offsets of the depth image for each window to produce a brute stack trace to be used as an anchor; means for cross-correlating all offsets to the anchor; determining means determining how much each trace should be shifted to sum most constructively with said anchor; means for recording said shifts for each window of each image point gather; and means for interpolating said shifts for apply to a whole seismic line wherein said non-hyperbolic residual moveout is removed.
Claim 7
Dependent Claim
20 words
The apparatus according to claim 4 wherein said means for separating includes: means for selecting a predetermined number of windows.
Claim 8
Dependent Claim
12 words
The apparatus according to claim 5 wherein said predetermined number is ten.
Claim 9
Dependent Claim
21 words
The apparatus according to claim 4 wherein said determining step includes the step of: limiting said shift to a preselected distance.
Claim 10
Dependent Claim
13 words
The apparatus according to claim 7 wherein said preselected distance is twenty meters.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-07 | 1996-01-06 | 1996-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-07 | 2000-01-06 | 2000-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-07 | 2004-01-06 | 2004-07-07 | $7700.00 | Window Closed / Lapsed |