US3622967A
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Optimum stack
Assignee: Mobil Oil AS
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Filing: 1968-11-07
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Granted: 1971-11-23
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Expires: 1988-11-07
Abstract
Abstract Seismic traces are weighted and stacked to produce an estimated output trace having improved signal-to-noise ratio. Those traces having the highest signal-to-noise ratio are weighted more heavily. The weights for each trace are determined from a detection of the signal between the estimated output trace and each of the seismic traces. The procedure is iterated so that the signal-to-noise ratio of the estimated output trace is progressively improved by recomputing the weights of the individual traces on each pass.
Inventors
- 👤 Manus R Foster
- 👤 Raymond L Sengbush
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:17
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/28; G01V1/36; G01V1/362; G06; G06G; G06G7/00; G06G7/12; G06G7/19; G06G7/1928; G01V2210/00; G01V2210/30; G01V2210/32; G01V2210/322
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
23 words
The method of utilizing automatic computing apparatus to stack m seismic traces to produce an estimated output trace having improved signal-to-noise ratio comprisiNg:
Claim 2
Independent Claim
23 words
The method of utilizing automatic computing apparatus to stack m seismic traces to produce an estimated output trace having improved signal-to-noise ratio comprisiNg:
Claim 3
Dependent Claim
50 words
Multiplying the samples of each seismic trace by amplitude coefficients Aj which for the successive seismic traces are denoted A1, A2 ...Am where m is the number of seismic traces, and where the amplitude coefficients are initially set equal to predetermined constants to produce a signal estimate for each trace,
Claim 4
Dependent Claim
50 words
Multiplying the samples of each seismic trace by amplitude coefficients Aj which for the successive seismic traces are denoted A1, A2 ...Am where m is the number of seismic traces, and where the amplitude coefficients are initially set equal to predetermined constants to produce a signal estimate for each trace,
Claim 5
Dependent Claim
16 words
Stacking the signal estimates of all of the m traces to produce an estimated output trace,
Claim 6
Dependent Claim
16 words
Stacking the signal estimates of all of the m traces to produce an estimated output trace,
Claim 7
Dependent Claim
21 words
The method recited in claim 1 wherein each of said steps is carried out on an automatic stored program digital computer.
Claim 8
Dependent Claim
16 words
Stacking the signal estimates of all of the m traces to produce an estimated output trace,
Claim 9
Dependent Claim
16 words
Stacking the signal estimates of all of the m traces to produce an estimated output trace,
Claim 10
Dependent Claim
31 words
Detecting a signal which is a function of both said estimated output trace and each of said traces to produce new amplitude coefficients A1, A2 ... Am for each trace, and
Claim 11
Dependent Claim
31 words
Detecting a signal which is a function of both said estimated output trace and each of said traces to produce new amplitude coefficients A1, A2 ... Am for each trace, and
Claim 12
Dependent Claim
40 words
The method recited in claim 1 wherein the step of detecting the signal includes computing the zero lag correlations between said estimated output trace and each of said signal traces to produce a zero lag cross-correlation function for each trace.
Claim 13
Dependent Claim
31 words
Detecting a signal which is a function of both said estimated output trace and each of said traces to produce new amplitude coefficients A1, A2 ... Am for each trace, and
Claim 14
Dependent Claim
31 words
Detecting a signal which is a function of both said estimated output trace and each of said traces to produce new amplitude coefficients A1, A2 ... Am for each trace, and
Claim 15
Dependent Claim
20 words
Iterating steps 1 through 3 using said new amplitude coefficients to produce an estimated output trace having improved signal-to-noise ratio.
Claim 16
Dependent Claim
20 words
Iterating steps 1 through 3 using said new amplitude coefficients to produce an estimated output trace having improved signal-to-noise ratio.
Claim 17
Dependent Claim
33 words
The method recited in claim 3 wherein the zero lag cross-correlation function between said estimated output and each of said seismic traces is normalized to produce a new amplitude coefficient for each trace.
Claim 18
Dependent Claim
20 words
Iterating steps 1 through 3 using said new amplitude coefficients to produce an estimated output trace having improved signal-to-noise ratio.
Claim 19
Dependent Claim
20 words
Iterating steps 1 through 3 using said new amplitude coefficients to produce an estimated output trace having improved signal-to-noise ratio.
Claim 20
Dependent Claim
16 words
The method recited in claim 1 wherein said predetermined constants are initially set equal to 1.
Claim 21
Dependent Claim
28 words
The method recited in claim 1 wherein said predetermined constants are initially set for each trace in accordance with predetermined knowledge of the signal-to-noise ratio of each trace.
Claim 22
Dependent Claim
19 words
The method recited in claim 1 wherein the steps (1) through (3) are iterated a predetermined number of times.
Claim 23
Dependent Claim
39 words
The method recited in claim 1 wherein the steps (1) through (3) are iterated until the difference between said new amplitude coefficients and the corresponding amplitude coefficients determined from the previous iteration is less than a preset error tolerance.
References Cited (Backward Citations)
US3108250A
Cited
US3398396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |