US3613071A
Expired / Lapsed
US
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Simultaneous dual seismic spread configuration for determining data processing of extensive seismic data
Assignee: PETTY GEOPHYSICAL ENG CO
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Filing: 1969-12-24
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Granted: 1971-10-12
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Expires: 1989-12-24
Abstract
Abstract Signals from the same seismic source are simultaneously recorded from two groups of seismic detector arrays. The two groups have detector arrays and array intervals unique to each group. The group closest to the seismic source accentuates shallow reflections and is characterized by: (1) closely spaced detectors in each array forming short arrays with short distances between array centers, (2) nearness to the source, (3) usually sampled and filtered to resolve high-frequency data, and (4) a low order of multiple coverage. The group more remote from the seismic source enhances the deeper reflections and is characterized by: (1) long arrays with long distances between array centers, (2) a location a mile or two from the source, (3) sampling and filtering to resolve low-frequency data, and (4) a high order of multiple coverage. A factor, i.e., number of detector arrays times the spacing between array centers divided by the multiplicity of coverage, for one group must be equal to the corresponding factor for the other group, although the multiplicities of coverage of the two groups are very different. The near group data determines the processing techniques and corrections for the mass of data from the far group.
Inventors
- 👤 Roy G Quay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:12
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/28; G01V1/36; G01V1/364; G01V1/16; G01V1/20; G01V2210/00; G01V2210/20; G01V2210/21
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
107 words
A method for obtaining seismic reflection signals, comprising the steps of: a. locating first and second group of seismic detectors along a traverse to respectively provide high and low multiplicity of coverage b. said first group including N1 detectors with a detector interval of D1 and said second group including N2 detectors with a detector interval of D2, c. determining the multiplicity of coverage M1 of said first group and M2 of said second group in accordance with the formula, N1 X D1/M1 N2 X D2/M2 and d. simultaneously recording seismic signals from said first and second group of detectors successively from seismic sources at different locations.
Claim 2
Independent Claim
107 words
A method for obtaining seismic reflection signals, comprising the steps of: a. locating first and second group of seismic detectors along a traverse to respectively provide high and low multiplicity of coverage b. said first group including N1 detectors with a detector interval of D1 and said second group including N2 detectors with a detector interval of D2, c. determining the multiplicity of coverage M1 of said first group and M2 of said second group in accordance with the formula, N1 X D1/M1 N2 X D2/M2 and d. simultaneously recording seismic signals from said first and second group of detectors successively from seismic sources at different locations.
Claim 3
Dependent Claim
26 words
A method as in claim 1 wherein said first group of detectors is located more remotely from a seismic source than said second group of detectors.
Claim 4
Dependent Claim
43 words
A method as in claim 1 wherein the seismic reflection signals received from said second group of detectors are passed through a higher frequency band-pass filter than the seismic reflection signals from said first group of detectors prior to recording said seismic signals.
Claim 5
Dependent Claim
31 words
A method as in claim 1 wherein the seismic signals from said second group of detectors are sampled more frequently than the seismic signals received from said first group of detectors
Claim 6
Dependent Claim
22 words
A method as in claim 1 wherein said first and second groups of detectors are located successively along a single marine cable.
Claim 7
Dependent Claim
22 words
A method as in claim 1 wherein said first and second groups of detectors are respectively located on at least two cables.
Claim 8
Dependent Claim
30 words
A method as in claim 1 wherein the multiplicity of coverage of said first group of detectors is higher than tHe multiplicity of coverage of said second group of detectors.
Claim 9
Dependent Claim
96 words
Apparatus for obtaining seismic reflection signals, comprising: first and second groups of seismic detectors located successively along a traverse to respectively provide high and low multiplicity of coverage, said first group including N1 detectors with a detector interval of D1 and said second group including N2 detectors with a detector interval of D2, said first group and said second group of detectors respectively providing M1 and M2 multiplicity of coverage in accordance with the formula, N1 D1/M1 N2 X D2/M2 and means for individually recording the seismic signals from said first and second groups of detectors.
Claim 10
Dependent Claim
96 words
Apparatus for obtaining seismic reflection signals, comprising: first and second groups of seismic detectors located successively along a traverse to respectively provide high and low multiplicity of coverage, said first group including N1 detectors with a detector interval of D1 and said second group including N2 detectors with a detector interval of D2, said first group and said second group of detectors respectively providing M1 and M2 multiplicity of coverage in accordance with the formula, N1 D1/M1 N2 X D2/M2 and means for individually recording the seismic signals from said first and second groups of detectors.
Claim 11
Dependent Claim
25 words
Apparatus as in claim 8 wherein said first group of detectors are located more remotely from a seismic source than said second group of detectors.
Claim 12
Dependent Claim
48 words
Apparatus as in claim 8 further comprising first and second frequency band-pass filters and said second frequency band-pass filter has a higher frequency band-pass than said first frequency band-pass filter, said first and second filters respectively filtering the seismic signals from said first and second groups of detectors.
Claim 13
Dependent Claim
47 words
Apparatus as in claim 8 further comprising means for sampling the seismic signals received by said first and second groups of seismic detectors and wherein the sampling rate is higher for the seismic signals from said second group of detectors than from said first group of detectors.
Claim 14
Dependent Claim
21 words
Apparatus as in claim 8 wherein said first and second groups of detectors are successively located along a single marine cable.
Claim 15
Dependent Claim
21 words
Apparatus as in claim 8 wherein said first and second groups of detectors are located along at least two marine cables.
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) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |