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公开(公告)号：US11092708B2
公开(公告)日：2021-08-17
申请号：US16350083
申请日：2018-09-21
Applicant: PGS Geophysical AS
Inventor： Shaoping Lu , Faqi Liu , Alejandro A. Valenciano Mavilio , Nizar Chemingui
Abstract: This disclosure describes processes and systems for generating a seismic image of a subterranean formation from recorded seismic data gathers obtained in a marine seismic survey of the subterranean formation. The seismic data comprises recorded pressure and vertical velocity wavefields that are used to separate the recorded pressure wavefield into upgoing and downgoing pressure wavefields. A seismic image is computed from the subterranean formation based on a product of the downgoing pressure wavefield and a migration operator applied to the upgoing pressure wavefield. The downgoing pressure wavefield is a boundary source wavefield and the upgoing pressure wavefield is boundary receiver wavefield of the migration operator. The seismic image is iteratively updated by computing a residual seismic image based on the upgoing pressure wavefield and adding the residual seismic image to the seismic image. The final seismic image displays increased illumination and reduced crosstalk artifacts compared to conventional seismic imaging techniques.
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2.发明申请公开(公告)号：US20190187313A1
公开(公告)日：2019-06-20
申请号：US16350083
申请日：2018-09-21
Applicant: PGS Geophysical AS
Inventor： Nizar Chemingui , Alejandro A. Valenciano Mavilio , Faqi Liu , Shaoping Lu
CPC classification number: G01V1/345 , G01V1/303 , G01V1/362 , G01V1/38 , G01V2210/32 , G01V2210/44 , G01V2210/51
Abstract: This disclosure describes processes and systems for generating a seismic image of a subterranean formation from recorded seismic data gathers obtained in a marine seismic survey of the subterranean formation. The seismic data comprises recorded pressure and vertical velocity wavefields that are used to separate the recorded pressure wavefield into upgoing and downgoing pressure wavefields. A seismic image is computed from the subterranean formation based on a product of the downgoing pressure wavefield and a migration operator applied to the upgoing pressure wavefield. The downgoing pressure wavefield is a boundary source wavefield and the upgoing pressure wavefield is boundary receiver wavefield of the migration operator. The seismic image is iteratively updated by computing a residual seismic image based on the upgoing pressure wavefield and adding the residual seismic image to the seismic image. The final seismic image displays increased illumination and reduced crosstalk artifacts compared to conventional seismic imaging techniques.
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公开(公告)号：US10996362B2
公开(公告)日：2021-05-04
申请号：US16281812
申请日：2019-02-21
Applicant: PGS Geophysical AS
Inventor： Shaoping Lu , Faqi Liu , Nizar Chemingui
Abstract: Inversion for marine seismic imaging of a full reflected wavefield can include generating an image of a subsurface formation by full wavefield migrating a recorded seismic wavefield and generating numerically modeled data using the image. A mismatch between the numerically modeled data and the seismic wavefield can be determined. Responsive to determining that the mismatch exceeds an inversion match threshold, the image can be updated using the mismatch between the numerically modeled data and the seismic wavefield.
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公开(公告)号：US20190257967A1
公开(公告)日：2019-08-22
申请号：US16281812
申请日：2019-02-21
Applicant: PGS Geophysical AS
Inventor： Shaoping Lu , Faqi Liu , Nizar Chemingui
Abstract: Inversion for marine seismic imaging of a full reflected wavefield can include generating an image of a subsurface formation by full wavefield migrating a recorded seismic wavefield and generating numerically modeled data using the image. A mismatch between the numerically modeled data and the seismic wavefield can be determined. Responsive to determining that the mismatch exceeds an inversion match threshold, the image can be updated using the mismatch between the numerically modeled data and the seismic wavefield.
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