Stanley Jerral Laster

US Patent:

48602655, Aug 22, 1989

Filed:

Jan 25, 1988

Appl. No.:

7/148307

Inventors:

Stanley J. Laster - Dallas TX
Robert A. Meek - Sanger TX
Thomas E. Shirley - Richardson TX

Assignee:

Mobil Oil Corporation - New York NY

International Classification:

G01V 128
G01V 136

US Classification:

367 73

Abstract:

Method of restoring null traces in seismic records. The seismic record is transformed from the x-t domain to the f-k domain by a series of fast Fourier transforms. The f-k transform of the seismic record is filtered to retain only coherent events and the filtered f-k transform is inverse-transformed back to the x-t domain. A first determination of the restored trace corresponding to the null trace is selected and substituted for the null trace. The first determination of the restored trace is used to determine a fully restored trace.

US Patent:

49531395, Aug 28, 1990

Filed:

Feb 5, 1990

Appl. No.:

7/474886

Inventors:

Stanley J. Laster - Dallas TX
Robert A. Meek - Sanger TX
Thomas E. Shirley - Richardson TX

Assignee:

Mobil Oil Corporation - New York NY

International Classification:

G01V 128
G01V 136

US Classification:

367 73

Abstract:

A seismic record is enhanced through trace restoration and extrapolation. A set of traces surrounding a missing trace or adjacent an edge of the seismic record are transformed into the frequency domain using a fast Fourier transform. Each frequency of the resultant x-f representation a series of complex numbers, one corresponding to each trace, is selected. Autoregressive model coefficients are estimated for this complex series using a recursive least squares method. A complex number is estimated for trace restoration and extrapolation from the series of complex numbers and autoregressive coefficients. After all frequency components are thus processed restored or extrapolated traces are obtained by an inverse Fourier transform.

US Patent:

48842486, Nov 28, 1989

Filed:

Jan 30, 1989

Appl. No.:

7/303199

Inventors:

Stanley J. Laster - Dallas TX
Robert A. Meek - Dallas TX
Thomas E. Shirley - Richardson TX

Assignee:

Mobil Oil Corporation - New York NY

International Classification:

G01V 128
G01V 136

US Classification:

367 73

Abstract:

Method for restoring seismic data to missing or severely noise contaminated traces included in a seismic section. The seismic section is transformed into a data localizing space and muted to retain only the localized data components of the seismic section. The muted transform space is inverse-transformed into the x-t domain to produce first estimates of the seismic data to be restored. The first estimates of the restored data are substituted for the corresponding traces in the original seismic section. Fully restored traces corresponding to the missing or severly noise contaminated traces are determined from the single estimate of the restored traces.

US Patent:

51915260, Mar 2, 1993

Filed:

Mar 12, 1990

Appl. No.:

7/491885

Inventors:

Stanley J. Laster - Dallas TX
Robert A. Meek - Sanger TX
Thomas E. Shirley - Richardson TX

Assignee:

Mobil Oil Corporation - Fairfax VA

International Classification:

G01V 100

US Classification:

364421

Abstract:

Method for removing coherent noise from a series of seismic traces. Each seismic trace included in the series is Fast Fourier Transformed into the frequency domain. For each frequency of the resultant f-x representation, a series of N complex numbers, one corresponding to each trace, is selected. The selected series of complex numbers corresponding to each frequency are processed to produce autoregressive model coefficients from which a polynomial rooting provides complex roots related to wavenumbers and decay constants. Amplitudes and phases for complex non-stationary spatial sinusoids associated with the estimated wavenumbers are then determined. For all frequencies f, the collection of determined wavenumbers, decay constants, amplitudes and phases constitute an f-k representation of the seismic traces. The produced f-k representation is examined to identify components corresponding to seismic data and the f-k components which correspond to seismic data are summed to reconstruct frequency components of an f-x representation of the acquired seismic traces with coherent noise removed.