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Patent US3622965A successfully refreshed from Google Patents.
US3622965A
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Method of geophysical prospecting by measuring the attenuation of seismic waves in the earth
Assignee: Western Atlas International Inc
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Filing: 1970-06-18
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Granted: 1971-11-23
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Expires: 1990-06-18
Abstract
Abstract A method of seismographic exploration, to determine the attenuation coefficient in a layer from which there is obtained substantial and persistent reflection energy, by: transforming the detected reflected signals to an integral transform domain, selecting a band of transform variables over which there is substantial and persistent reflection energy, and measuring the ratios of the amplitudes of the transformed signals to obtain a measure of the attenuation coefficient of the reflected seismic signals in the studied layer.
Inventors
- 👤 Chang Sheng Wu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:01
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/28; G01V1/30; G01V1/306
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
120 words
A method of seismographic exploration by determining a measure of the attenuation of reflected seismic signals in a layer of earth studied comprising the steps of: propagating acoustic signals through said layer; detecting in the time domain the reflected seismic signals from the upper and lower boundaries of said layer; transforming both of said detected reflected seismic signals from the time domain to the integral transform domain thereby forming two distinct transformed signals; selecting a band of transform variables over which there is substantial reflection energy; and obtaining a measure of the attenuation coefficient of the reflected seismic signals through said layer by measuring the ratio of the amplitudes of said transformed signals over said selected band of transform variables.
Claim 2
Independent Claim
120 words
A method of seismographic exploration by determining a measure of the attenuation of reflected seismic signals in a layer of earth studied comprising the steps of: propagating acoustic signals through said layer; detecting in the time domain the reflected seismic signals from the upper and lower boundaries of said layer; transforming both of said detected reflected seismic signals from the time domain to the integral transform domain thereby forming two distinct transformed signals; selecting a band of transform variables over which there is substantial reflection energy; and obtaining a measure of the attenuation coefficient of the reflected seismic signals through said layer by measuring the ratio of the amplitudes of said transformed signals over said selected band of transform variables.
Claim 3
Dependent Claim
28 words
The method of claim 1 and further including the step of: compensating, prior to the transforming step, the amplitude of the detected reflected seismic signals for geometric spreading.
Claim 4
Dependent Claim
26 words
The method of claim 1 wherein, said integral transform is a Fourier transform; and said selected band of transform variables is a selected band of frequencies.
Claim 5
Dependent Claim
14 words
The method of claim 3 wherein, said band is limited to a single frequency.
Claim 6
Dependent Claim
15 words
The method of claim 3 wherein, said Fourier transforM is represented as a Fourier series.
Claim 7
Dependent Claim
13 words
The method of claim 1 wherein, said integral transform is a Laplace transform.
Claim 8
Dependent Claim
14 words
The method of claim 1 wherein, said integral transform is the spectral density function.
Claim 9
Dependent Claim
23 words
The method of claim 1 wherein, said layer is relatively large, and said boundaries are selected to provide substantial and persistent reflected energy.
References Cited (Backward Citations)
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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) | 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 |