公开(公告)号：US10139509B2

公开(公告)日：2018-11-27

申请号：US15078020

申请日：2016-03-23

Applicant: CHEVRON U.S.A. INC.

Inventor： Yonghe J. Sun ,  Craig S. Huber

IPC: G01V1/30

Abstract: A method for seismic imaging of a subsurface volume of interest may include an imaging technique such as reverse time migration which uses a conditioned velocity model that replaces at least one sharp velocity transition with a gradual velocity transition including a velocity overshoot layer. The method may be performed by a computer system.

公开(公告)号：US20240125956A1

公开(公告)日：2024-04-18

申请号：US18046236

申请日：2022-10-13

Applicant: Chevron U.S.A. Inc.

Inventor： Yonghe J. Sun

IPC: G01V1/28 ,  G01V1/30

CPC classification number: G01V1/282 ,  G01V1/307

Abstract: A method is described for seismic amplitude analysis that uses a set of artificial and individually separable reflectors consistent with dip fields in the subsurface volume of interest to define an AVA basis functions; the AVA basis functions are used in true-3D AVA modeling and true-3D AVA inversion. The inversion result and well logs representative of the subsurface volume of interest are used to train a model to create a rock property prediction model. The method may apply the rock property prediction model to a second seismic image to generate a rock property volume. The method is executed by a computer system.

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.

公开(公告)号：US12253641B2

公开(公告)日：2025-03-18

申请号：US18046236

申请日：2022-10-13

Applicant: Chevron U.S.A. Inc.

Inventor： Yonghe J. Sun

IPC: G01V1/28 ,  G01V1/30

Abstract: A method is described for seismic amplitude analysis that uses a set of artificial and individually separable reflectors consistent with dip fields in the subsurface volume of interest to define an AVA basis functions; the AVA basis functions are used in true-3D AVA modeling and true-3D AVA inversion. The inversion result and well logs representative of the subsurface volume of interest are used to train a model to create a rock property prediction model. The method may apply the rock property prediction model to a second seismic image to generate a rock property volume. The method is executed by a computer system.

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：US10353095B2

公开(公告)日：2019-07-16

申请号：US15191670

申请日：2016-06-24

Applicant: CHEVRON U.S.A. INC.

Inventor： Yonghe J. Sun ,  Weihong Fei ,  Craig A. Barker

IPC: G01V1/30 ,  G01V1/36

Abstract: A method is described for seismic imaging of complex subsurface volumes using prismatic seismic energy. The method receives a seismic dataset and an earth model. The earth model is perturbed such that prismatic reflections will generate perturbed seismic amplitudes in a target area and seismic imaging is performed using the perturbed model. A second seismic image is generated using a second earth model; the second earth model may be the original earth model or a second perturbed model wherein the perturbation generates different seismic amplitudes in the target area. The two seismic images are differenced to generate a prismatic seismic image that can be used to identify geologic features that are poorly illuminated in conventional imaging. The method may be executed by a computer system.