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US4779238A
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Method for fast slant stack of seismic data
Assignee: ConocoPhillips Co
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Filing: 1987-04-13
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Granted: 1988-10-18
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Expires: 2007-04-13
Abstract
Abstract A method for processing seismic data in the x-t domain to derive a slant stack in the p-tau domain wherein partial slant stacks are computed over a plurality of small groups of traces which are iteratively merged using linear interpolation into successively larger groups of traces to exhibit the p-tau data characteristics.
Inventors
- 👤 Michael S. Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:52
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/28; G01V1/36; G01V1/362
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
185 words
A method for fast slant stack of seismic data, comprising the steps of: inputting selected seismic data in the form of a plurality of spatially related traces having known offset x and time t; defining a sampling grid of slope p for the range 0 to Δt/Δx in terms of Δp n =(1/2) n Δt/Δx wherein slope p is a variable value that changes with the value of n through a progression of n data iterations; evaluating first slant stacks of successive pairs of 2 1 traces through time t for slopes 0 and 1/2Δt/Δx to establish basic interpolation weights of 1 and 1/2:1/2 relative to the sampling grid; merging data from adjoining groups of 2 1 slant stack traces into groups of 2 2 slant stack traces having a sampling grid that is summed from the basic interpolation weights of 1 and 1/2:1/2; repeating said merging step for successive adjoining groups of 2 2 through 2 n slant stack traces through a total n interations whereupon sufficient refinement of the sampling grid is attained; and outputting a p-tau display of said selected seismic data.
Claim 2
Independent Claim
185 words
A method for fast slant stack of seismic data, comprising the steps of: inputting selected seismic data in the form of a plurality of spatially related traces having known offset x and time t; defining a sampling grid of slope p for the range 0 to Δt/Δx in terms of Δp n =(1/2) n Δt/Δx wherein slope p is a variable value that changes with the value of n through a progression of n data iterations; evaluating first slant stacks of successive pairs of 2 1 traces through time t for slopes 0 and 1/2Δt/Δx to establish basic interpolation weights of 1 and 1/2:1/2 relative to the sampling grid; merging data from adjoining groups of 2 1 slant stack traces into groups of 2 2 slant stack traces having a sampling grid that is summed from the basic interpolation weights of 1 and 1/2:1/2; repeating said merging step for successive adjoining groups of 2 2 through 2 n slant stack traces through a total n interations whereupon sufficient refinement of the sampling grid is attained; and outputting a p-tau display of said selected seismic data.
Claim 3
Dependent Claim
39 words
A method as set forth in claim 1 wherein said step of evaluating comprises: deriving weights of 1 at the grid points and 1/2:1/2 for points halfway between grid points of the slopes p 0 and p 1 .
Claim 4
Dependent Claim
30 words
A method as set forth in claim 1 which is further characterized in that: the interpolation weights for Δp n+1 are a linear combination of weights from Δp n .
Claim 5
Dependent Claim
30 words
A method as set forth in claim 2 which is further characterized in that: the interpolation weights for Δp n+1 are a linear combination of weights from Δp n .
Claim 6
Dependent Claim
28 words
A method as set forth in claim 1 which further includes: inputting a multiple of groups of 2 n spatially related traces and processing through repeated iterative mergings.
Claim 7
Dependent Claim
19 words
A method as set forth in claim 5 wherein: said multiple of groups of related traces are serially aligned.
Claim 8
Dependent Claim
39 words
A method as set forth in claim 1 which further includes the step of: shifting each successive input trace by at least one sample per trace thereby to extend the total range of p values of said sampling grid.
Claim 9
Dependent Claim
38 words
A method as set forth in claim 7 which includes: shifting each successive input trace by one sample per trace so that the fast slant stack p-tau display gives p values in the range of Δt/Δx to 2ΔtΔx.
References Cited (Backward Citations)
US4648039A
Cited
US4628492A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-18 | 1992-04-18 | 1992-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-18 | 1996-04-18 | 1996-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-18 | 2000-04-18 | 2000-10-18 | $7700.00 | Window Closed / Lapsed |