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US4964089A
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Method for derivation of internal velocities from post-migration parts
Assignee: ConocoPhillips Co
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Filing: 1989-12-22
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Granted: 1990-10-16
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Expires: 2009-12-22
Abstract
Abstract A method for derivation of interval velocities from post-migration parts first includes the step of determining the apparent depth and slope of an event. The apparatus depth of an event is measured. The travel time of the recorded reflection for a particular offset is determined by ray-tracing through the old model and recorded. A trial velocity is assigned to the layer between events in the new model. The depth of the reflector is varied up or down until the computed travel time agrees with the measured travel time, keeping the source/receiver separation constant. A new velocity for the layer between reflectors is selected for which the depths at each offset are the same.
Inventors
- 👤 Shein S. Wang
- 👤 Douglas W. Hanson
- 👤 Thomas D. Cavanaugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:03
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/28; G01V1/30; G01V1/301; G01V1/282
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
180 words
A method for deriving interval velocities for a new model from post migration parts of an old model comprising the steps of: receiving seismic data including the old model having several events with layers between said events; determining the apparent depth and slope of a first event for each offset in the post migrated parts; determining the travel time of the recorded reflection from said first event for a particular offset by ray-tracing through the old model; assigning a trial velocity to the layer between said first event and a selected, event in the new model; tracing rays for each offset from the source to said first event and back to a receiver; computing a travel time for each ray traced; varying the depth of said first event up and down until the computed travel time agrees with the measured travel time previously determined; maintaining the source receiver separation constant for each offset travel time; and selecting a velocity for the layer between said first event and said selected event for which the depths at each offset are the same.
Claim 2
Independent Claim
180 words
A method for deriving interval velocities for a new model from post migration parts of an old model comprising the steps of: receiving seismic data including the old model having several events with layers between said events; determining the apparent depth and slope of a first event for each offset in the post migrated parts; determining the travel time of the recorded reflection from said first event for a particular offset by ray-tracing through the old model; assigning a trial velocity to the layer between said first event and a selected, event in the new model; tracing rays for each offset from the source to said first event and back to a receiver; computing a travel time for each ray traced; varying the depth of said first event up and down until the computed travel time agrees with the measured travel time previously determined; maintaining the source receiver separation constant for each offset travel time; and selecting a velocity for the layer between said first event and said selected event for which the depths at each offset are the same.
Claim 3
Dependent Claim
23 words
The method according to claim 1 wherein said selecting step includes the steps of: determining the depth correlation by a least squares process.
Claim 4
Dependent Claim
29 words
The method according to claim 1 wherein said tracing step includes the steps of: shooting a plurality of rays at several predetermined surface locations from events having different depths.
Claim 5
Dependent Claim
173 words
The method according to claim 1 also including the steps of: determining the apparent depth and slope of said event for each offset in the post migrated parts at a plurality of ground locations; determining the travel time of the recorded reflection from said event for said each offset by ray-tracing through the old model; assigning a second trial velocity to the layer between said second event and a second selected event in the new model; tracing rays for said each offset from the source to said second event and back to a receiver; computing a travel time for each ray traced; varying the depth of said second event up and down until the computed travel time agrees with the measured travel time previously determined; maintaining the source receiver separation constant for said each offset travel time; selecting a second velocity for the layer between said second event and the second selected event for which the depths at said each offset are the same; and adding an additional layer to said new model.
Claim 6
Dependent Claim
23 words
The method according to claim 4 wherein said selecting step includes the steps of: determining the depth correlation by a least squares process.
Claim 7
Dependent Claim
29 words
The method according to claim 4 wherein said tracing step includes the steps of: shooting a plurality of rays at several predetermined surface locations from events having different depths.
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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) | 1993-10-15 | 1994-04-16 | 1994-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-15 | 1998-04-16 | 1998-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-15 | 2002-04-16 | 2002-10-16 | $7700.00 | Window Closed / Lapsed |