公开(公告)号：US11880009B2

公开(公告)日：2024-01-23

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

CPC classification number: G01V1/308 ,  G01V1/282 ,  G01V1/36 ,  G01V2210/42 ,  G01V2210/51

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：US11048001B2

公开(公告)日：2021-06-29

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.