US3697938A
Expired / Lapsed
US
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Seismic prospecting with random injected signal
Assignee: FIRST CITY NATIONAL BANK OF HOUSTON A NATIONAL BANKING ASSOCIATION
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Filing: 1969-11-07
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Granted: 1972-10-10
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Expires: 1989-11-07
Abstract
Abstract A method of seismic prospecting using an injected seismic signal which includes a series of impulses spaced in time from one another by time intervals of a random nature. The time spacing is substantially non-repetitive and exhibits no ascending, descending or harmonic patterns.
Inventors
- 👤 Mehmet Turhan Taner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:23
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/003; G01V1/005
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
67 words
A method of seismic prospecting comprising the steps of: injecting a seismic signal, including a plurality of impulses in pseudorandom time spacing from one another, into the earth; detecting a return signal including Reflections of impulses in the injected seismic signal from subsurface strata in the earth; and correlating the detected signal according to the pseudorandom time spacing to produce a composite representation of the subsurface strata.
Claim 2
Independent Claim
67 words
A method of seismic prospecting comprising the steps of: injecting a seismic signal, including a plurality of impulses in pseudorandom time spacing from one another, into the earth; detecting a return signal including Reflections of impulses in the injected seismic signal from subsurface strata in the earth; and correlating the detected signal according to the pseudorandom time spacing to produce a composite representation of the subsurface strata.
Claim 3
Dependent Claim
44 words
A method according to claim 1 wherein the seismic signal exceeds in time duration the maximum effective travel time for reflected impulses in the detected signal, and wherein a large number of such impulses are produced within an interval equal to such travel time.
Claim 4
Dependent Claim
27 words
A method according to claim 1 wherein the time spacing between impulses is characterized by the absence of small integral multiples of time spacing one to another.
Claim 5
Dependent Claim
21 words
A method according to claim 1 wherein the impulses are characterized by square waveshapes exhibiting a broad band of frequency content.
Claim 6
Dependent Claim
35 words
A method according to claim 1 wherein the detected impulses are recorded on a single recording and correlation thereof is by additive compositing in accordance with the individual time spacings between impulses in the pattern.
Claim 7
Independent Claim
63 words
A method of determining travel time between spaced first and second points, comprising the steps of: transmitting a series of impulses from the first point to the second point, the impulses in the series being spaced from one another in time according to a pseudorandom time spacing; detecting the series of impulses; and compositing such impulses in accordance with the pseudorandom time spacing.
Claim 8
Independent Claim
63 words
A method of determining travel time between spaced first and second points, comprising the steps of: transmitting a series of impulses from the first point to the second point, the impulses in the series being spaced from one another in time according to a pseudorandom time spacing; detecting the series of impulses; and compositing such impulses in accordance with the pseudorandom time spacing.
Claim 9
Dependent Claim
42 words
A method according to claim 6 wherein the impulses are reflected from at least one third point in travel between the first and second points, and the length in time duration of the series of impulses exceeds the effective maximum travel time.
Claim 10
Dependent Claim
36 words
A method according to claim 7 wherein the number of such impulses in the series and the spacing in time between impulses is such that the average time spacing is less than the average travel time.
Claim 11
Dependent Claim
32 words
A method according to claim 8 wherein the impulses are of a waveshape characterized by the absence of substantially sinusoidal portions, and by the inclusion of a broad band of frequency components.
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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |