公开(公告)号：US20180024261A1

公开(公告)日：2018-01-25

申请号：US15218910

申请日：2016-07-25

Applicant: Chevron U.S.A. Inc.

Inventor： Andrew Stuart Madof

IPC: G01V1/30 ,  E21B43/00 ,  G01V1/36 ,  E21B41/00 ,  G06T5/20 ,  G06T11/60

CPC classification number: G01V1/30 ,  E21B41/0092 ,  E21B43/00 ,  G01V1/301 ,  G01V1/306 ,  G01V1/307 ,  G01V1/345 ,  G01V1/364 ,  G01V99/00 ,  G06T5/20 ,  G06T11/60 ,  G06T2207/30181

Abstract: Various embodiments of identifying a clathrate deposit in a subsurface from seismic data are provided. In one embodiment, a method includes using a computing system in generating a land surface or sea floor digital image from post-stack seismic data; determining a clathrate stability zone from the land surface or sea floor digital image; generating a laterally extensive subsurface digital image from the seismic data that is within or below the clathrate stability zone; filtering the laterally extensive subsurface digital image to generate a pull-up digital image; generating a coarse-grained sediment digital image from the seismic data within the clathrate stability zone; spatially superimposing the coarse-grained sediment digital image and the pull-up digital image to generate a combined digital image; and determining an overlap region from the combined digital image. The overlap region is indicative of a clathrate deposit. Also provided are embodiments of producing hydrocarbons.

公开(公告)号：US10067252B2

公开(公告)日：2018-09-04

申请号：US15218910

申请日：2016-07-25

Applicant: Chevron U.S.A. Inc.

Inventor： Andrew Stuart Madof

IPC: E21B41/00 ,  G01V1/30 ,  G06T5/20 ,  G06T11/60 ,  G01V1/36 ,  E21B43/00

Abstract: A method includes using a computing system in generating a land surface or sea floor digital image from post-stack seismic data and determining a clathrate stability zone from the land surface or sea floor digital image. The method also includes generating a laterally extensive subsurface digital image from the seismic data that is within or below the clathrate stability zone and filtering the laterally extensive subsurface digital image to generate a pull-up digital image. The method also includes generating a coarse-grained sediment digital image from the seismic data within the clathrate stability zone. The method also includes spatially superimposing the coarse-grained sediment digital image and the pull-up digital image to generate a combined digital image. The method also includes determining an overlap region from the combined digital image. The overlap region is indicative of a clathrate deposit.

公开(公告)号：US20180024262A1

公开(公告)日：2018-01-25

申请号：US15218920

申请日：2016-07-25

Applicant: Chevron U.S.A. Inc.

Inventor： Andrew Stuart Madof

IPC: G01V1/30 ,  E21B41/00 ,  G01V1/36 ,  E21B49/00

Abstract: Various embodiments of quantifying a clathrate deposit in a subsurface from seismic data are provided. In one embodiment, the method includes using a computing system in: determining a maximum and a minimum value of a pull-up, where the pull-up is from a digital image; estimating a sound-wave speed of a clathrate deposit causing the pull-up and a sound-wave speed of a background deposit, where the clathrate deposit and the background deposit are different; calculating a gross clathrate thickness using the maximum value of the pull-up, the minimum value of the pull-up, the sound-wave speed of the clathrate deposit, and the sound-wave speed of the background deposit; using the sound-wave speed of the clathrate deposit to establish a relationship with clathrate concentration value; and determining a net clathrate thickness using a product of the gross clathrate thickness and the clathrate concentration value. Also provided are embodiments of producing hydrocarbons.