Time-lapse full waveform inversion of vertical seismic profile data: Workflow and application to the CO2CRC Otway project

Egorov, A. and Pevzner, R. and Bóna, A. and Glubokovskikh, S. and Puzyrev, V. and Tertyshnikov, K. and Gurevich, B. 2017. Time-lapse full waveform inversion of vertical seismic profile data: Workflow and application to the CO2CRC Otway project. Geophysical Research Letters.

Source Title

Geophysical Research Letters

DOI

10.1002/2017GL074122

ISSN

0094-8276

School

Department of Exploration Geophysics

URI

http://hdl.handle.net/20.500.11937/55714

Collection

Curtin Research Publications

Abstract

©2017. American Geophysical Union. Vertical seismic profile (VSP) is one of the technologies for monitoring hydrocarbon production and CO 2 geosequestration. However, quantitative interpretation of time-lapse VSP is challenging due to its irregular distribution of source-receiver offsets. One way to overcome this challenge is to use full waveform inversion (FWI), which does not require regular offsets. We present a workflow of elastic FWI applied to offset vertical seismic profile data for the purpose of identification and estimation of time-lapse changes introduced by injection of 15,000 t of CO 2 -rich gas mixture at 1.5 km depth. Application of this workflow to both synthetic and field data shows that elastic FWI is able to detect and quantify the time-lapse anomaly in P wave velocity with the magnitude of 100-150 m/s.