公开(公告)号：US20170115418A1

公开(公告)日：2017-04-27

申请号：US15318139

申请日：2015-06-29

Applicant: CGG SERVICES SAS

Inventor： Bruno GRATACOS ,  Andrew RATCLIFFE ,  Gilles LAMBARE ,  Graham ROBERTS ,  Lian DUAN

IPC: G01V1/36 ,  G01V1/28

Abstract: A method for processing seismic data from a subsurface using least squares migration or wave equation migration velocity analysis over a cost function comprising a function of a matching filter by iteratively updating the reflectivity model velocity model to yield an updated reflectivity model or updated velocity model that matches the observed seismic data.

公开(公告)号：US20230350089A1

公开(公告)日：2023-11-02

申请号：US17734322

申请日：2022-05-02

Applicant: CGG SERVICES SAS

Inventor： Andrew RATCLIFFE ,  Cris HENSTOCK ,  Wenlei GAO ,  Nabil MASMOUDI

IPC: G01V1/30 ,  G01V1/28

CPC classification number: G01V1/30 ,  G01V1/282 ,  G01V2210/65

Abstract: Seismic data is processed using a full-waveform inversion using a model with a pseudo-δ layer. The presence of the pseudo-δ layer in the model enables handing the difference at the water bottom between acoustically generated synthetic data and seismic data that corresponds to an elastic medium. The pseudo-δ layer may be less than 100 m thick and/or may be located directly underneath the water bottom. The pseudo-δ layer may have a negative value for S and a null value for ϵ (δ and ϵ being Thomsen's anisotropy parameters).

公开(公告)号：US20210063590A1

公开(公告)日：2021-03-04

申请号：US16913385

申请日：2020-06-26

Applicant: CGG SERVICES SAS

Inventor： James COOPER ,  Andrew RATCLIFFE ,  Gordon POOLE

IPC: G01V1/28 ,  G01V1/34 ,  G01V1/30

Abstract: Methods and apparatuses for seismic exploration of an underground structure obtain improved images by integrating partial match filtering in an FWI. Filtered (auxiliary) data replaces one of the observed data and the synthetic data in the FWI's objective function to avoid cycle skipping.

公开(公告)号：US20170248715A1

公开(公告)日：2017-08-31

申请号：US15511606

申请日：2015-09-22

Applicant: CGG SERVICES SAS

Inventor： Tim SEHER ,  Henning HOEBER ,  Andrew RATCLIFFE

IPC: G01V1/28 ,  G01V1/30

CPC classification number: G01V1/282 ,  G01V1/303 ,  G01V1/306 ,  G01V1/308 ,  G01V2210/612 ,  G01V2210/614 ,  G01V2210/622

Abstract: Simultaneous inversion of multi-vintage seismic data obtains seismic data for vintages and generates an initial earth model for each vintage. A cost function includes a data norm term having for at least one pair of vintages of seismic data a difference norm between a difference in obtained seismic data for the at least one pair of vintages and a difference in modeled seismic data for the at least one pair of vintages. The cost function also includes a model norm term for each pair of vintages selected from at least three vintages of seismic data. Each model norm term includes a difference norm between earth models for a given pair of vintages. A closure relationship is imposed on all earth models. The earth models are adjusted for the vintages to drive the cost function to a minimum and to produce updated earth models.

公开(公告)号：US20180335531A1

公开(公告)日：2018-11-22

申请号：US15970967

申请日：2018-05-04

Applicant: CGG SERVICES SAS

Inventor： Andrew RATCLIFFE ,  Francesco PERRONE ,  Graham ROBERTS ,  Martin CHAPPELL

IPC: G01V1/28 ,  G01V1/30

Abstract: A method for obtaining an image of an explored subsurface formation. The method includes receiving seismic data, wherein the seismic data is associated with a source or a seismic sensor placed in a well; forward propagating a first wavelet from the source using a first velocity model; backward propagating a second wavelet from the seismic sensor using a second velocity model, which is different from the first velocity model; and applying an imaging condition to the forward propagated first wavelet and the backward propagated second wavelet to calculate a reflectivity of the subsurface.