公开(公告)号：US20190293814A1

公开(公告)日：2019-09-26

申请号：US15926700

申请日：2018-03-20

Applicant: Chevron U.S.A. Inc.

Inventor： Stephen Allan Horne

IPC: G01V1/30 ,  G01V1/40 ,  G01V1/16

Abstract: One embodiment includes receiving seismic data from a plurality of seismic sensors located proximate to a build section of a wellbore that is drilled into a subsurface. The seismic data is recorded for a plurality of seismic waves, at different angles, sent from a plurality of seismic sources towards the plurality of seismic sensors. Locations of the plurality of seismic sources relative to locations of the plurality of seismic sensors are such that the plurality of seismic waves are essentially planar at the plurality of seismic sensors. The subsurface is essentially homogenous proximate to the build section. For at least a portion of the plurality of seismic waves, the embodiment includes determining a slowness vector for each seismic wave, and determining a phase velocity and a phase angle. The embodiment includes determining at least one anisotropic parameter value for the build section, determining a vertical velocity value, and using these.

公开(公告)号：US11719843B2

公开(公告)日：2023-08-08

申请号：US16840551

申请日：2020-04-06

Applicant: CHEVRON U.S.A. INC.

Inventor： Stephen Allan Horne

IPC: G01V1/50 ,  G01V1/30 ,  G01V5/12 ,  G01V11/00

CPC classification number: G01V1/50 ,  G01V1/306 ,  G01V5/12 ,  G01V11/002 ,  G01V2210/47 ,  G01V2210/626

Abstract: Embodiments of determining a vertically transverse isotropy (VTI) anisotropy along a horizontal section of a wellbore drilled into a formation are provided. One embodiment comprises determining elastic constants C11, C44, and C66 of the horizontal section and determining a vertical compressional slowness of the horizontal section corresponding to an elastic constant C33 of the horizontal section using a model with a condition. The model is built using second sonic log data and second density log data of the vertical wellbore. The condition is that the shear slowness (DTS) of the vertical wellbore is equal to the vertically polarized shear slowness (DTSV) of the horizontal section. The embodiment further comprises determining a VTI anisotropy along the horizontal section using the elastic constants C11, C44, C66, and C33 of the horizontal section.

公开(公告)号：US10901103B2

公开(公告)日：2021-01-26

申请号：US15926700

申请日：2018-03-20

Applicant: Chevron U.S.A. Inc.

Inventor： Stephen Allan Horne

IPC: G01V1/30 ,  G01V1/40 ,  G01V1/16 ,  G01V1/42

Abstract: One embodiment includes receiving seismic data from a plurality of seismic sensors located proximate to a build section of a wellbore that is drilled into a subsurface. The seismic data is recorded for a plurality of seismic waves, at different angles, sent from a plurality of seismic sources towards the plurality of seismic sensors. Locations of the plurality of seismic sources relative to locations of the plurality of seismic sensors are such that the plurality of seismic waves are essentially planar at the plurality of seismic sensors. The subsurface is essentially homogenous proximate to the build section. For at least a portion of the plurality of seismic waves, the embodiment includes determining a slowness vector for each seismic wave, and determining a phase velocity and a phase angle. The embodiment includes determining at least one anisotropic parameter value for the build section, determining a vertical velocity value, and using these.