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A case study: travel time inversion for P-wave velocity using OBS data of South China Sea

A case study: travel time inversion for P-wave velocity using OBS data of South China Sea
A case study: travel time inversion for P-wave velocity using OBS data of South China Sea
It is very important for converting the seismic data from the time domain to the depth domain. Here we discuss the approaches of inverse modeling of travel times for determination of the P-wave velocity (Vp). The migration section of the single channel seismic data is used to define the model horizons and help to control their geometry. Wide angle hydrophone data of OBS are used to determine P-wave travel times. The picked travel times from various shots are inverted for P-wave interval velocities using RayInvr, which calculated theoretical travel times via ray tracing. Damped least squares optimization is performed to fine tune the fits between observed and calculated travel times. In the end, the Vp curve is achieved and the results are compared with that derived from the conventional hyperbolic curve velocity analysis method, the shape of the two curves are similar, and the velocity increases in the layer where gas hydrates are present.
RayInvr, OBS, Gas hydrate, Ray tracing, Interval velocities
0025-3235
389-396
Wang, Xiangchun
93763ff9-d3d4-4805-b1f6-f7e0029cf5d5
Minshull, Timothy A.
bf413fb5-849e-4389-acd7-0cb0d644e6b8
Xia, Changliang
a69f128a-3b07-4475-9b41-7193c19cafd5
Liu, Xuewei
f10f8fb2-41ee-4266-b311-7ebdbfa0a1fb
Wang, Xiangchun
93763ff9-d3d4-4805-b1f6-f7e0029cf5d5
Minshull, Timothy A.
bf413fb5-849e-4389-acd7-0cb0d644e6b8
Xia, Changliang
a69f128a-3b07-4475-9b41-7193c19cafd5
Liu, Xuewei
f10f8fb2-41ee-4266-b311-7ebdbfa0a1fb

Wang, Xiangchun, Minshull, Timothy A., Xia, Changliang and Liu, Xuewei (2012) A case study: travel time inversion for P-wave velocity using OBS data of South China Sea. Marine Geophysical Researches, 33 (4), 389-396. (doi:10.1007/s11001-013-9167-7).

Record type: Article

Abstract

It is very important for converting the seismic data from the time domain to the depth domain. Here we discuss the approaches of inverse modeling of travel times for determination of the P-wave velocity (Vp). The migration section of the single channel seismic data is used to define the model horizons and help to control their geometry. Wide angle hydrophone data of OBS are used to determine P-wave travel times. The picked travel times from various shots are inverted for P-wave interval velocities using RayInvr, which calculated theoretical travel times via ray tracing. Damped least squares optimization is performed to fine tune the fits between observed and calculated travel times. In the end, the Vp curve is achieved and the results are compared with that derived from the conventional hyperbolic curve velocity analysis method, the shape of the two curves are similar, and the velocity increases in the layer where gas hydrates are present.

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More information

Published date: 2012
Keywords: RayInvr, OBS, Gas hydrate, Ray tracing, Interval velocities
Organisations: Geology & Geophysics

Identifiers

Local EPrints ID: 351305
URI: http://eprints.soton.ac.uk/id/eprint/351305
ISSN: 0025-3235
PURE UUID: 013dad6f-6e02-453d-9836-eddfbf1f8e16
ORCID for Timothy A. Minshull: ORCID iD orcid.org/0000-0002-8202-1379

Catalogue record

Date deposited: 18 Apr 2013 08:36
Last modified: 15 Mar 2024 03:04

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Contributors

Author: Xiangchun Wang
Author: Changliang Xia
Author: Xuewei Liu

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