US5148406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for simultaneous collection of seismic data from shallow and deep targets
Assignee: Westerngeco AS
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Filing: 1990-05-25
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Granted: 1992-09-15
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Expires: 2010-05-25
Abstract
Abstract A method for simultaneous collection of seismic data of shallow and deep targets, in which two seismic streamers are towed at different water depths (1 and 2 in FIG. 2), and only one acoustic source of seismic signals is used. The seismic data recorded by the different streamers are mixed in a subsequent processing step, seismic data being weighted before being mixed by a weight which is made dependent on the recorded two-way travel time for the respective streamers, so that data from one or several streamers located at the least water depth receive a weight which decreases with travel time, whereas data from a corresponding number of streamers of greater depths receive a weight which increases with travel time.
Inventors
- 👤 Munday Brink
- 👤 Jan Gateman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:14
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/38; G01V1/3808; G01V1/28; G01V2210/00; G01V2210/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
119 words
In a method for simultaneous collection of seismic data of shallow and deep targets, wherein at least two seismic streamers are towed by a vessel at a different water depth, and only one acoustic source for the seismic signals is used, the improvement comprising: weighting seismic data recorded by different seismic streamers with a weight which is made dependent on two-way travel time recorded by the respective steamers so that data from at least one streamer positioned at the least water depth receives a weight decreasing with travel time, and data from a corresponding number of streamers at a greater water depth receive a weight increasing with travel time; and mixing said seismic data from said different seismic streamers.
Claim 2
Dependent Claim
119 words
In a method for simultaneous collection of seismic data of shallow and deep targets, wherein at least two seismic streamers are towed by a vessel at a different water depth, and only one acoustic source for the seismic signals is used, the improvement comprising: weighting seismic data recorded by different seismic streamers with a weight which is made dependent on two-way travel time recorded by the respective steamers so that data from at least one streamer positioned at the least water depth receives a weight decreasing with travel time, and data from a corresponding number of streamers at a greater water depth receive a weight increasing with travel time; and mixing said seismic data from said different seismic streamers.
Claim 3
Dependent Claim
22 words
A method as claimed in claim 1, and further comprising: relating and associating said two-way travel time with a certain geological structure.
Claim 4
Dependent Claim
23 words
A method as claimed in claim 1, and further comprising: correcting said recorded seismic data to a plane of reference before said mixing.
Claim 5
Dependent Claim
23 words
A method as claimed in claim 3, and further comprising: carrying out said mixing immediately after said correcting to the plane of reference.
Claim 6
Dependent Claim
39 words
A method as claimed in claim 1, and further comprising: after said weighting and before said mixing stacking said data to reduce the amount of data recorded by a streamer to only one time series for each surface point.
Claim 7
Dependent Claim
22 words
A method as claimed in claim 4, and further comprising: relating and associating said two-way travel time with a certain geological structure.
Claim 8
Dependent Claim
39 words
A method as claimed in claim 2, and further comprising: after said weighting and before said mixing stacking said data to reduce the amount of data recorded by a streamer to only one time series for each surface point.
Claim 9
Dependent Claim
39 words
A method as claimed in claim 3, and further comprising: after said weighting and before said mixing stacking said data to reduce the amount of data recorded by a streamer to only one time series for each surface point.
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) | 1995-09-15 | 1996-03-16 | 1996-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-15 | 2000-03-16 | 2000-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-15 | 2004-03-16 | 2004-09-15 | $7700.00 | Window Closed / Lapsed |