公开(公告)号：US20230137100A1

公开(公告)日：2023-05-04

申请号：US17515105

申请日：2021-10-29

Applicant: Chevron U.S.A. Inc.

Inventor： Yonghe J. Sun ,  Chunling Wu ,  Mark Chengliang Fan

IPC: G01V1/28 ,  G01V1/30 ,  G01V1/34

Abstract: A method is described for seismic imaging improved by an estimation of attenuation including receiving a pre-migration seismic dataset D(s, r; t) representative of a subsurface volume of interest wherein s indicates source location, r indicates receiver location, and t is the recorded travel time; calculating a pre-migration attenuated travel time t*(s, r; t); computing a time derivative of the pre-migration attenuated travel time wherein 1/Q(s, r; t)=∂t*(s, r; t)/∂t; performing a first migration on D(s,r;t) to generate common image point (CIP) gathers G(x, h) wherein x is subsurface image point and h is angle or offset; performing a second migration on D(s, r; t)*1/Q(s, r; t) to generate weighted common image point (CIP) gathers G1/Q(x, h); and calculating a conditioned ratio of the weighted CIP gathers G1/Q(x, h) over the CIP gathers G(x, h) to get CIP gathers of 1/Q(x, h) is disclosed.

公开(公告)号：US11754733B2

公开(公告)日：2023-09-12

申请号：US17515105

申请日：2021-10-29

Applicant: Chevron U.S.A. Inc.

Inventor： Yonghe J. Sun ,  Chunling Wu ,  Mark Chengliang Fan

IPC: G01V1/28 ,  G01V1/34 ,  G01V1/30

CPC classification number: G01V1/282 ,  G01V1/306 ,  G01V1/345 ,  G01V2210/584

Abstract: A method is described for seismic imaging improved by an estimation of attenuation including receiving a pre-migration seismic dataset D(s, r; t) representative of a subsurface volume of interest wherein s indicates source location, r indicates receiver location, and t is the recorded travel time; calculating a pre-migration attenuated travel time t*(s, r; t); computing a time derivative of the pre-migration attenuated travel time wherein 1/Q(s, r; t)=∂t*(s, r; t)/∂t; performing a first migration on D(s,r;t) to generate common image point (CIP) gathers G(x, h) wherein x is subsurface image point and h is angle or offset; performing a second migration on D(s, r; t)*1/Q(s, r; t) to generate weighted common image point (CIP) gathers G1/Q(x, h); and calculating a conditioned ratio of the weighted CIP gathers G1/Q(x, h) over the CIP gathers G(x, h) to get CIP gathers of 1/Q(x, h) is disclosed.

公开(公告)号：US20230140168A1

公开(公告)日：2023-05-04

申请号：US17515043

申请日：2021-10-29

Applicant: Chevron U.S.A. Inc.

Inventor： Yonghe J. Sun ,  Chunling Wu ,  Mark Chengliang Fan

IPC: G01V1/34 ,  G01V1/30

Abstract: A method is described for seismic data processing including receiving a seismic dataset D(s, r; t) representative of a subsurface volume of interest; calculating a pre-migration attenuated travel time t*(s, r; t); performing a first migration on D(s, r; t) to generate common image point (CIP) gathers G(x, h); performing a second migration on D(s, r; t)*t*(s, r; t) to generate weighted common image point (CIP) gathers Gt*(x, h); and calculating a conditioned ratio of the weighted CIP gathers Gt*(x, h) over the CIP gathers G(x, h) to get CIP gathers of attenuated traveltime t*(x, h). The CIP gathers of attenuated traveltime t*(x, h) may be used to perform seismic tomography to generate an attenuation (Q) model.