公开(公告)号：US20240310544A1

公开(公告)日：2024-09-19

申请号：US18512089

申请日：2023-11-17

Applicant: CGG SERVICES SAS

Inventor： Kawin NIMSAILA ,  Gang LIU ,  Zedong WU ,  Zhigang ZHANG ,  Ping WANG

IPC: G01V1/34 ,  G01V1/28

CPC classification number: G01V1/345 ,  G01V1/282

Abstract: A method for imaging a formation of a subsurface includes receiving input data d related to the subsurface, generating synthetic data u related to the subsurface, by applying an implicit finite-difference approach to a reflectivity model r, updating a velocity model V based on the input data d and the synthetic data u, and generating an image of the formation in the subsurface based on the updated velocity model, wherein the formation is used to locate natural resources.

公开(公告)号：US20220308245A1

公开(公告)日：2022-09-29

申请号：US17453994

申请日：2021-11-08

Applicant: CGG SERVICES SAS

Inventor： Hui HUANG ,  Diancheng WANG ,  Ping WANG

IPC: G01V1/28 ,  G01V1/34 ,  G01V1/30

Abstract: Limitations in accuracy and computing power requirements impeding conventional Kirchhoff migration and reverse time migration are overcome by using the wave-equation Kirchhoff, WEK, technique with Kirchhoff migration. WEK technique includes forward-propagating a low-frequency wavefield from a shot location among pre-defined source locations, calculating an arrival traveltime of a maximum amplitude of the low-frequency wavefield, and applying Kirchhoff migration using the arrival traveltime and the maximum amplitude.

公开(公告)号：US20200309980A1

公开(公告)日：2020-10-01

申请号：US16662644

申请日：2019-10-24

Applicant: CGG SERVICES SAS

Inventor： Diancheng WANG ,  Ping WANG

IPC: G01V1/32 ,  G01V1/30 ,  G01V99/00 ,  G06F17/50

Abstract: Methods and devices for seismic exploration of an underground structure apply W2-based full-wave inversion to transformed synthetic and seismic data. Data transformation ensures that the synthetic and seismic data are positive definite and have the same mass using an adaptive normalization. This approach yields superior results particularly when the underground structure includes salt bodies.

公开(公告)号：US20190302293A1

公开(公告)日：2019-10-03

申请号：US16049941

申请日：2018-07-31

Applicant: CGG SERVICES SAS

Inventor： Zhigang ZHANG ,  Ping WANG ,  Adriano GOMES ,  Jiawei MEI ,  Feng LIN ,  Rongxin HUANG

IPC: G01V1/30 ,  G01V1/28

Abstract: Methods and devices use improved FWI techniques for seismic exploration of subsurface formations including salt bodies using a travel-time cost function. In calculating the travel-time cost function, time-shifts may be weighted using cross-correlation coefficients of respective time-shifted recorded data and synthetic data generated based on current velocity model. The improved methods enhance the resulting image while avoiding cycle-skipping and issues related to amplitude difference between synthetic and recorded data.

公开(公告)号：US20220308246A1

公开(公告)日：2022-09-29

申请号：US17380103

申请日：2021-07-20

Applicant: CGG SERVICES SAS

Inventor： Zhiguang XUE ,  Zhigang ZHANG ,  Ping WANG

IPC: G01V1/30 ,  G01V1/36 ,  G01V1/28

Abstract: Methods and devices according to various embodiments perform full-wave inversion jointly for datasets acquired at different times over the same underground formation using a time-lag cost function with target regularization terms. This approach improves the 4D signal within reservoirs and suppresses 4D noise outside.

公开(公告)号：US20230288590A1

公开(公告)日：2023-09-14

申请号：US18145115

申请日：2022-12-22

Applicant: CGG SERVICES SAS

Inventor： Zedong WU ,  Zhiyuan WEI ,  Zhigang ZHANG ,  Jiawei MEI ,  Rongxin HUANG ,  Ping WANG

IPC: G01V1/28 ,  G01V1/30

CPC classification number: G01V1/282 ,  G01V1/303 ,  G01V2210/614

Abstract: A method for seismic imaging of a subsurface using a full waveform inversion, FWI, includes the steps of obtaining an initial P-velocity model that describes how a seismic wave propagates through the subsurface, generating an S-velocity model based on the initial P-velocity model, generating an elastic synthetic dataset p based on the initial P-velocity model and the S-velocity model, receiving a recorded seismic dataset d of the subsurface, updating the P-velocity model based on a comparison between the synthetic dataset p and the recorded seismic dataset d, updating a reflectivity at various locations in the subsurface based on the updated P-velocity model, and generating an image of the subsurface based on the reflectivity.