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USH482H Expired / Lapsed US ⏱️ 0.0 years remaining

Seismic migration method

Assignee: ExxonMobil Upstream Research Co
•
Filing: 1986-10-20
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Granted: 1988-06-07
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Expires: 2006-10-20
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Abstract

Abstract A seismic data processing method in which seismic traces (each trace containing a signal resulting from reflection of a seismic signal at a location within the earth, and each trace being associated with at least one point in a two-dimensional spatial grid (x,y)) are subjected to Fourier transformations, the coefficients of the Fourier-Transformed traces are subjected to a recursive KF migration operation, and the migrated traces are thereafter inverse-Fourier-transformed. When displayed, the processed seismic data accurately represents the position within the earth of whatever caused the reflection. The method may be employed to process stacked seismic traces, each associated with a single point (x,y) in the grid, or may be employed to process unstacked seismic traces, each associated with both a seismic source location (x s ,y 5 ) and a different seismic receiver location (x r ,y r ) in the grid. In performing the method, the earth is modeled as a stack of M horizontal layers each characterized by a seismic wave velocity. The recursive KF migration step is iterated M-1 times for each trace, where part of the output of each iteration is stored and part discarded.

Inventors

  • 👤 John R. Berryhill
  • 👤 Ruth Gonzalez
  • 👤 Young C. Kim

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 16:48
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/28; G01V1/36; G01V1/362

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 201 words
A method for processing a set of seismic traces, each trace corresponding to at least one location in a two-dimensional spatial grid (x,y), and each trace including a set of N time samples corresponding to time instants {t i =iΔt:1≦i≦N}, given a time-depth relationship {t i ,z i :1≦i≦N} for each trace, said method including the steps of: (a) determining a reduced set of time-depth pairs {t j ref ,z j ref :1≦j≦M, M<N}, where t 1 =t 1 av =t 1 ref , z 1 ref =z 1 av , |t i av -[t j-1 ref +(z i av -z j-1 ref )(t j ref -t j-1 ref )/(z j ref -z j-1 ref )]|<E, where t j-1 ref <t i av ≦t j ref , z i av is determined by adding together the depth values z i for each trace and dividing by the number of traces, and E is a selected acceptable tolerance on the order of about 10Δt; (b) subjecting each trace to Discrete Fourier Transforms on the spatial coordinates corresponding to the trace, and on time index i; (c) performing recursive KF migration on the traces after they have been transformed in step (b); and
Claim 2
Independent Claim 201 words
A method for processing a set of seismic traces, each trace corresponding to at least one location in a two-dimensional spatial grid (x,y), and each trace including a set of N time samples corresponding to time instants {t i =iΔt:1≦i≦N}, given a time-depth relationship {t i ,z i :1≦i≦N} for each trace, said method including the steps of: (a) determining a reduced set of time-depth pairs {t j ref ,z j ref :1≦j≦M, M<N}, where t 1 =t 1 av =t 1 ref , z 1 ref =z 1 av , |t i av -[t j-1 ref +(z i av -z j-1 ref )(t j ref -t j-1 ref )/(z j ref -z j-1 ref )]|<E, where t j-1 ref <t i av ≦t j ref , z i av is determined by adding together the depth values z i for each trace and dividing by the number of traces, and E is a selected acceptable tolerance on the order of about 10Δt; (b) subjecting each trace to Discrete Fourier Transforms on the spatial coordinates corresponding to the trace, and on time index i; (c) performing recursive KF migration on the traces after they have been transformed in step (b); and
Claim 3
Dependent Claim 20 words
(d) subjecting each migrated trace generated in step (c) to Discrete Inverse Fourier Transforms on the spatial coordinates corresponding thereto.
Claim 4
Dependent Claim 20 words
(d) subjecting each migrated trace generated in step (c) to Discrete Inverse Fourier Transforms on the spatial coordinates corresponding thereto.
Claim 5
Dependent Claim 57 words
The method of claim 1, where each trace is a stacked trace g(x,y,t i ), corresponding to a single point (x mn , y mn ) in grid (x,y), and (x mn , y mn ) is determined by the position coordinates of the seismic sources and receivers associated with the individual traces comprising the stacked trace.
Claim 6
Dependent Claim 51 words
The method of claim 1, where each trace is an unstacked trace g(x s , y s , x R , y R , t i ) corresponding to a seismic source position (x s , y s ) and to an acoustic receiver position (x R , y R ).

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1991-06-07 1991-12-07 1992-06-07 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1995-06-07 1995-12-07 1996-06-07 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1999-06-07 1999-12-07 2000-06-07 $7700.00 Window Closed / Lapsed

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