Methods and systems for least-squares wave-equation kirchhoff migration using wave propagation
AssigneeBP Corporation North America Inc.
InventorsHu Jin, John Etgen
Life of this patent
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Abstract
A computer-implemented method for determining modeled seismic data of a subsurface region includes receiving observed seismic data from the subsurface region captured by one or more seismic receivers as one or more reflected seismic signals; determining, based on a velocity model of the subsurface region and the observed seismic data, a traveltime function associated with the subsurface region; migrating, using the traveltime function and a Kirchhoff migration operator, the observed seismic data to produce a migrated seismic image; and performing reverse-time demigration on the migrated seismic image, using the velocity model and a solved full wave-equation, to produce modeled seismic data.
Claims28
A computer-implemented method for determining modeled seismic data associated with a subsurface region, the method comprising:
- (a) receiving observed seismic data from a subsurface region captured by one or more seismic receivers as one or more reflected seismic signals;
- (b) determining, based on a velocity model of the subsurface region and the observed seismic data, a traveltime function associated with the subsurface region;
- (c) migrating, using the traveltime function and a Kirchhoff migration operator, the observed seismic data to produce a migrated seismic image;
- and
- (d) performing reverse-time demigration on the migrated seismic image, using the velocity model and a solved full wave-equation, to produce modeled seismic data.
A system comprising:
- a one or more processors;
- and
- a storage device coupled to the one or more processors, the storage device configured to store instructions that, when executed by the one or more processors, configure the one or more processors to:
- (a) receive observed seismic data from a subsurface region captured by one or more seismic receivers as one or more reflected seismic signals;
- (b) determine, based on a velocity model of the subsurface region and the observed seismic data, a traveltime function associated with the subsurface region;
- (c) migrate, using the traveltime function and a Kirchhoff migration operator, the observed seismic data to produce a migrated seismic image;
- and
- (d) perform reverse-time demigration on the migrated seismic image, using the velocity model and a solved full wave-equation, to produce modeled seismic data.
A computer-implemented method for generating a seismic image representative of a subsurface region, the method comprising:
- (a) receiving observed seismic data from the subsurface region captured by one or more seismic receivers as one or more reflected seismic signals;
- (b) performing, using a Kirchhoff migration operator, adjoint modeling on the observed seismic data to produce a migrated seismic image;
- (c) performing reverse-time demigration on the migrated seismic image, using a full wave-equation, to produce modeled seismic data representative of the subsurface region;
- (d) comparing the modeled seismic data with the observed seismic data to determine residual seismic data;
- (e) performing, using the Kirchhoff migration operator, adjoint modeling on the residual seismic data to determine one or more seismic gradients;
- (f) applying the one or more seismic gradients to the migrated seismic image to produce an updated seismic image;
- and
- (g) stacking the updated seismic image to produce a seismic image representative of the subsurface region.
Dependencies are inferred from the claim text.