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：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：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.

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.