US3668620A
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Method and apparatus for determination of seismic signal event coherence
Assignee: ConocoPhillips Co
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Filing: 1969-07-25
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Granted: 1972-06-06
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Expires: 1989-07-25
Abstract
Abstract A method and apparatus for processing multitrace seismic signals to determine the most coherent dip attitude for any selected point in time. The method serves to accentuate similar event signals from a plurality of seismic traces at selected time delays per trace for predetermined time increments along the multi-trace seismic signals. In one form, the dipping event signal accentuating process may be carried out by combining each of the plural traces of selected time delays per trace to derive a plurality of signals each indicative of a selected step-out or dip angle, and thereafter combining the plurality of signals to produce an output signal indicative of the most coherent dip attitude.
Inventors
- 👤 Paul G Mathieu
- 👤 Paul V Lindblade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:16
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/28; G01V2210/00; G01V2210/20
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
166 words
A method for seismic signal processing of plural seismic trace inputs to emphasize dipping events having greatest coherence, comprising the steps of: varying the time relationship of the plural trace inputs by a selected first time delay per trace to produce first time displaced trace signals; combining the first time displaced trace signals into a first combined signal having an amplitude which is an indication of event coherence at said first time delay per trace; varying the time relationship of the plural trace inputs by a selected second time delay per trace to produce second time displacEd trace signals; combining the second time displaced trace signals into a second combined signal having an amplitude which is an indication of event coherence at said second time delay per trace; and continually selecting the one of said first or second combined signals having greatest amplitude for application as the instantaneous output signal to produce an output indication which is indicative of dipping events having greater than selected coherence.
Claim 2
Independent Claim
166 words
A method for seismic signal processing of plural seismic trace inputs to emphasize dipping events having greatest coherence, comprising the steps of: varying the time relationship of the plural trace inputs by a selected first time delay per trace to produce first time displaced trace signals; combining the first time displaced trace signals into a first combined signal having an amplitude which is an indication of event coherence at said first time delay per trace; varying the time relationship of the plural trace inputs by a selected second time delay per trace to produce second time displacEd trace signals; combining the second time displaced trace signals into a second combined signal having an amplitude which is an indication of event coherence at said second time delay per trace; and continually selecting the one of said first or second combined signals having greatest amplitude for application as the instantaneous output signal to produce an output indication which is indicative of dipping events having greater than selected coherence.
Claim 3
Dependent Claim
122 words
A method as set forth in claim 1 which is further characterized to include the steps of: varying the time relationship of the plural trace inputs an additional plurality of times each by selected different time delays per trace to produce an additional plurality of differently time displaced trace signals; combining the additional plurality of time displaced trace signals into an additional plurality of combined signals having an amplitude which is an indication of event coherence at said additional plurality of time delay per trace; and selecting the one of each of said additional pluralities of combined signals along with said first and second combined signals for application as the output signal which is indicative of dipping events having the greatest coherence.
Claim 4
Dependent Claim
74 words
A method as set forth in claim 1 wherein each of said steps of combining comprise: deriving a summation signal of all of said respective time displaced trace signals which summation signal is also applied as said combined signal to said selecting step; deriving a plurality of difference signals as between each of said time displaced trace signals and said summation signal; and combining said difference signals for application to said step of selecting.
Claim 5
Dependent Claim
74 words
A method as set forth in claim 2 wherein each of said steps of combining comprise: deriving a summation signal of all of said respective time displaced trace signals which summation signal is also applied as said combined signal to said selecting step; deriving a plurality of difference signals as between each of said time displaced trace signals and said summation signal; and combining said difference signals for application to said step of selecting.
Claim 6
Dependent Claim
86 words
A method as set forth in claim 1 wherein each of said steps of combining comprise: deriving a summation signal from all of said respective time displaced trace signals; deriving a plurality of difference signals as between each of said time displaced trace signals and the derived summation signal; combining the plurality of difference signals to derive a gain control output; and varying the summation signal output in accordance with said gain control output for subsequent application as the combined signal is said step of selecting.
Claim 7
Dependent Claim
86 words
A method as set forth in claim 2 wherein each of said steps of combining comprise: deriving a summation signal from all of said respective time displaced trace signals; deriving a plurality of difference signals as between each of said time displaced trace signals and the derived summation signal; combining the plurality of difference signals to derive a gain control output; and varying the summation signal output in accordance with said gain control output for subsequent application as the combined signal in said step of selecting.
Claim 8
Dependent Claim
35 words
A method as set forth in claim 5 which is further characterized to include the steps of: deriving a reciprocal signal value for said combined difference signal output for further output as said gain control.
Claim 9
Dependent Claim
33 words
A method as set forth in claim 6 which is further characterized to include: deriving a reciprocal signal value for said combined difference signal output for further output as said gain control output.
Claim 10
Independent Claim
165 words
A method for processing plural seismic trace inputs in order emphasize dipping events having greatest coherence, comprising the steps of: processing the plural trace inputs to provide a plurality of parallel groups of plural trace outputs, each group hAving a different time delay per trace which is consonant with event dip parameters; combining plural trace outputs from each of the plurality of trace groups to provide a plurality of combined signals having an amplitude which is an indication of event coherence at the respective time delay per trace; deriving plural difference signals for each of the trace groups which difference signal is the difference between each of the respective time-delayed plural trace outputs and the respective group combined signal; combining said plural difference signals from each trace group to produce a gain control signal; and comparing said plurality of group gain control signals to derive a determination as to which one of the output combined signals is applied as an output indication of greatest coherence.
Claim 11
Independent Claim
165 words
A method for processing plural seismic trace inputs in order emphasize dipping events having greatest coherence, comprising the steps of: processing the plural trace inputs to provide a plurality of parallel groups of plural trace outputs, each group hAving a different time delay per trace which is consonant with event dip parameters; combining plural trace outputs from each of the plurality of trace groups to provide a plurality of combined signals having an amplitude which is an indication of event coherence at the respective time delay per trace; deriving plural difference signals for each of the trace groups which difference signal is the difference between each of the respective time-delayed plural trace outputs and the respective group combined signal; combining said plural difference signals from each trace group to produce a gain control signal; and comparing said plurality of group gain control signals to derive a determination as to which one of the output combined signals is applied as an output indication of greatest coherence.
Claim 12
Dependent Claim
62 words
A method as set forth in claim 9 which is further characterized in that: each of said group gain control signals is derived as a reciprocal of the sum of the absolute values of said groups of plural difference signals; and the gain of said group combined signals is controlled in proportion to the reciprocal gain control signal of the respective group.
Claim 13
Dependent Claim
28 words
A method as set forth in claim 9 which is further characterized in that: said step of combining plural trace outputs consists of algebraically summing said trace outputs.
Claim 14
Dependent Claim
29 words
A method as set forth in claim 9 which is further characterized in that: said step of combining said plural difference signals consists of arithmetically summing said difference signals.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |