Lin Zhang

US Patent:

20230099919, Mar 30, 2023

Filed:

Mar 15, 2021

Appl. No.:

17/279375

Inventors:

- San Ramon CA, US
Uwe K. Albertin - Houston TX, US
Kurt T. Nihei - Houston TX, US
Sam T. Kaplan - Houston TX, US
Gary Michael Hoversten - Lafayette CA, US
Lin Zhang - Houston TX, US
Dimitri Bevc - Houston TX, US

International Classification:

G01V 1/28
G01V 1/34
G01V 1/30

Abstract:

A method is described for generating a subsurface model using stochastic full waveform inversion by receiving a seismic dataset representative of a subsurface volume of interest; performing stochastic full waveform inversion of the seismic dataset to generate a long wavelength subsurface model; and performing full waveform inversion of the seismic dataset using the long wavelength subsurface model as a starting model to generate an improved subsurface model. The method may further include performing seismic imaging of the seismic dataset using the improved subsurface model to generate a seismic image and identifying geologic features based on the seismic image. The method may be executed by a computer system.

US Patent:

20200284937, Sep 10, 2020

Filed:

Mar 4, 2019

Appl. No.:

16/291912

Inventors:

- San Ramon CA, US
Lin ZHANG - Sugar Land TX, US

Assignee:

Chevron U.S.A. Inc. - San Ramon CA

International Classification:

G01V 1/50
G06N 20/00
G01V 1/22

Abstract:

A method is described for improving distributed acoustic sensing (DAS) seismic data in order to identify seismic events which includes receiving a DAS seismic dataset recorded by a fiber-optic cable in a borehole drilled through a subsurface volume of interest; identifying a portion of the seismic dataset including random noise with no signal to generate a windowed noise dataset; transforming the windowed noise dataset into a noise power spectrum; training a machine-learning algorithm using the noise power spectrum; using the machine-learning algorithm to remove random noise from the DAS seismic dataset to generate a noise-attenuated seismic dataset; and identifying the seismic events in the noise-attenuated seismic dataset. The method may be executed by a computer system.

US Patent:

20190086564, Mar 21, 2019

Filed:

Sep 20, 2018

Appl. No.:

16/136616

Inventors:

- San Ramon CA, US
Uwe K. Albertin - Katy TX, US
Lin Zhang - Sugar Land TX, US

Assignee:

Chevron U.S.A. Inc. - San Ramon CA

International Classification:

G01V 1/28
G01V 1/34
G01V 1/30

Abstract:

A method is described for full waveform inversion using a b-spline projection that produces an earth model that can be used for seismic imaging. The method may be executed by a computer system.