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

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Authors
Egorov, A.
Pevzner, R.
Bóna, A.
Glubokovskikh, S.
Puzyrev, V.
Tertyshnikov, Konstantin
Gurevich, B.
Date
2017
Type
Journal Article

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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.
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Geophysical Research Letters
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Department of Exploration Geophysics
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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.