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US 10,942,286 B2Granted
System and method for image-domain full waveform inversion
AssigneeChevron U.S.A. Inc.
InventorUwe K. Albertin
Life of this patent
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Abstract
A method is described for image-domain full waveform inversion. The method may include receiving, at a computer processor, a seismic dataset representative of the subsurface volume of interest and an initial earth model; performing, via the computer processor, an image domain full waveform inversion to generate an updated earth model; and performing, via the computer processor, seismic imaging of the seismic dataset using the updated earth model to generate a seismic image. The method may be executed by a computer system.
Claims6
A computer-implemented method, comprising:
- a. receiving, at a computer processor, a seismic dataset representative of a subsurface volume of interest and an initial earth model;
- b. performing, via the computer processor, an image domain full waveform inversion including backprojection to generate an updated earth model;
- wherein the image domain full waveform inversion comprises:
- i. performing an initial imaging step to create at least one gather of a model perturbation δm in an extended model domain;
- ii. enhancing the at least one gathers with an operator E to generate at least one enhanced gather that is more consistent with a correct model;
- iii. creating a residual (E−1)δm by subtracting the at least one gather from the at least one enhanced gather;
- iv. backprojecting the residual in a tomographic FWI operation to obtain a long wavelength background model parameter gradient;
- and
- v. updating the initial earth model using a nonlinear solver and the long wavelength background model parameter gradient to generate the updated earth model;
- and
- c. performing, via the computer processor, seismic imaging of the seismic dataset using the updated earth model to generate a seismic image.
8 more elements
A computer-implemented method, comprising:
- a. receiving, at a computer processor, a seismic dataset representative of a subsurface volume of interest and an initial earth model;
- b. performing, via the computer processor, an image domain full waveform inversion including backprojection to generate an updated earth model;
- wherein the image domain full waveform inversion comprises:
- i. performing an initial imaging step to create at least one gather of a model perturbation δm in an extended model domain;
- ii. enhancing the at least one gather with an operator E to make the model perturbation gathers more consistent with a correct model to generate at least one enhanced gather;
- iii. demigrating and remigrating the at least one enhanced gather to generate at least one new migrated gather;
- iv. spectral amplitude matching M of the at least one new migrated gather to the at least one gather;
- v. creating a residual MF*FEδm−δm by subtracting the at least one gather from the at least one new migrated gather;
- vi. backprojecting the residual in a tomographic FWI operation to obtain a long wavelength background model parameter gradient;
- and
- vii. updating the initial earth model using a nonlinear solver and the long wavelength background model parameter gradient to generate the updated earth model;
- and
- c. performing, via the computer processor, seismic imaging of the seismic dataset using the updated earth model to generate a seismic image.
10 more elements
Dependencies are inferred from the claim text.