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.