-
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.
-
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.
-
公开(公告)号：US10359526B2
公开(公告)日：2019-07-23
申请号：US15012961
申请日：2016-02-02
Applicant: PGS Geophysical AS
Inventor： Grunde Rønholt , Nizar Chemingui , Alejandro Antonio Valenciano Mavilio , Shaoping Lu
Abstract: Amplitude-versus-angle analysis for quantitative interpretation can include creation of a plurality of angle gathers from imaging a subsurface location with multiples in a near-offset range and imaging primaries outside the near-offset range and application of an amplitude-versus-angle analysis to the plurality of angle gathers to produce a quantitative interpretation pertaining to the subsurface location.
-
公开(公告)号：US11609349B2
公开(公告)日：2023-03-21
申请号：US17060763
申请日：2020-10-01
Applicant: PGS Geophysical AS
Inventor： Norman Daniel Whitmore, Jr. , Jaime Ramos-Martinez , Sean Crawley , Yang Yang , Alejandro Antonio Valenciano Mavilio , Nizar Chemingui
Abstract: Methods and systems described herein are directed to determining properties of a subterranean formation using an acoustic wave-equation with a novel formulation in terms of a velocity model and a reflectivity model of the subterranean formation. The acoustic wave equation may be used with full-waveform inversion to build high-resolution velocity and reflectivity models of a subterranean formation. The acoustic wave equation may be also used with least-squares reverse time migration in the image and space domains, to build a reflectivity model of the subterranean formation with enhanced resolution and amplitude fidelity. The velocity and reflectivity models of materials that form the subterranean formation reveal the structure and lithology of features of the subterranean formation and may reveal the presence of oil and natural gas reservoirs.
-
公开(公告)号：US11428834B2
公开(公告)日：2022-08-30
申请号：US16221128
申请日：2018-12-14
Applicant: PGS Geophysical AS
Abstract: This disclosure describes processes and systems for generating a high-resolution velocity model of a subterranean formation from recorded seismic data gathers obtained in a marine seismic survey of the subterranean formation. A velocity model is computed by iterative FWI using reflections, resolving the velocity field of deep subterranean targets without requiring ultralong offsets. The processes and systems use of an impedance sensitivity kernel to characterize reflections in a modeled wavefield, and then use the reflections to compute a velocity sensitivity kernel that is used to produce low-wavenumber updates to the velocity model. The iterative process is applied in a cascade such that position of reflectors and background velocity are simultaneously updated. Once the low-wavenumber components of the velocity model are updated, the velocity model is used as an input of conventional FWI to introduce missing velocity components (i.e., high-wavenumber) to increase the resolution of the velocity model.
-
Patent Agency Ranking
公开(公告)号：US10353092B2
公开(公告)日：2019-07-16
申请号：US15364585
申请日：2016-11-30
Applicant: PGS Geophysical AS
Inventor： Sean Crawley , Jaime Ramos-Martinez , Alejandro Antonio Valenciano Mavilio , Nizar Chemingui
Abstract: The present disclosure is related to a velocity model update with a full waveform inversion gradient. At least one method can include updating a velocity model of a subsurface, which can include suppressing high wavenumber components of the velocity model provided by reflected energy with a decomposed full waveform inversion gradient. Low wavenumber components can be preserved in the velocity model.
-
7.发明授权公开(公告)号：US09651695B2
公开(公告)日：2017-05-16
申请号：US14337957
申请日：2014-07-22
Applicant: PGS Geophysical AS
Inventor： Shaoping Lu , Norman Daniel Whitmore, Jr. , Alejandro Antonio Valenciano Mavilio , Nizar Chemingui , Andrew Long , Grunde Rønholt
CPC classification number: G01V1/36 , G01V1/284 , G01V1/38 , G01V2210/56 , G01V2210/632 , G01V2210/74
Abstract: One embodiment relates to a technological process for identifying a potential subsurface structure below a body of water. Three-dimensional seismic sensor data that includes at least two measured components is obtained. Up-going and down-going wavefields comprising multiples wavefields are constructed from the three-dimensional seismic sensor data by applying wavefield separation. The up-going and down-going wavefields are extrapolated to a reflector surface below a water bottom. An imaging condition is applied at the reflector surface to generate images that include information from the multiples wavefields. Angle gathers are constructed, where each angle gather is constructed by gathering the images generated using the multiples wavefields for a range of illumination angles. Other embodiments, aspects and features are also disclosed.
-
公开(公告)号：US10690792B2
公开(公告)日：2020-06-23
申请号：US16509009
申请日：2019-07-11
Applicant: PGS Geophysical AS
Inventor： Grunde Rønholt , Nizar Chemingui , Alejandro Antonio Valenciano Mavilio , Shaoping Lu
Abstract: Amplitude-versus-angle analysis for quantitative interpretation can include creation of a plurality of angle gathers from imaging a subsurface location with multiples in a near-offset range and imaging primaries outside the near-offset range and application of an amplitude-versus-angle analysis to the plurality of angle gathers to produce a quantitative interpretation pertaining to the subsurface location.
-
9.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.
-
公开(公告)号：US09689999B2
公开(公告)日：2017-06-27
申请号：US14550001
申请日：2014-11-21
Applicant: PGS Geophysical AS
Inventor： Didier B. P. Lecerf , Nizar Chemingui , Alejandro A. Valenciano Mavilio , Shaoping Lu
CPC classification number: G01V1/28 , G01V2210/1293 , G01V2210/1423 , G01V2210/56 , G01V2210/57
Abstract: Techniques are disclosed relating to geophysical analysis. In one embodiment, a method includes receiving seismic data for a geophysical formation recorded during a seismic survey using one or more seabed sensors and one or more sources. In this embodiment, the method includes determining a seismic gather for a location in the geophysical formation, modifying the seismic gather by interchanging source-receiver definitions for the seismic gather, and imaging the location using the modified gather. In this embodiment, the imaging uses higher-order reflections recorded in the seismic gather. In some embodiments, the method includes separating up-going and down-going wavefields and separately imaging using the up-going wavefield and the down-going wavefield.
-
-
-
-
-
-
-
-
-
Search Results
23
records
(took 0.014 seconds)
