Journal
COMMUNICATIONS IN COMPUTATIONAL PHYSICS
Volume 28, Issue 1, Pages 249-275Publisher
GLOBAL SCIENCE PRESS
DOI: 10.4208/cicp.OA-2018-0143
Keywords
Waveform inversion; time-lapse seismic; seismic inverse scattering; target-oriented inversion; Gaussian beam based Green's function
Categories
Funding
- Research Council of Norway [267769]
- Research Council of Norway
- ConocoPhillips Skandinavia AS
- Aker BP ASA
- Eni Norge AS
- Maersk Oil Norway AS
- Statoil Petroleum AS
- Neptune Energy Norge AS
- Lundin Norway AS
- Halliburton AS
- Schlumberger Norge AS
- Wintershall Norge AS
- DEA Norge AS of The National IOR Centre of Norway
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Full waveform inversion of time-lapse seismic data can be used as a means of estimating the reservoir changes due to the production. Since the repeated computations for the monitor surveys lead to a large computational cost, time-lapse full waveform inversion is still considered to be a challenging task. To address this problem, we present an efficient target-oriented inversion scheme for time-lapse seismic data using an integral equation formulation with Gaussian beam based Green's function approach. The proposed time-lapse approach allows one to perform a local inversion within a small region of interest (e.g. a reservoir under production) for themonitor survey. We have verified that the T-matrix approach is indeed naturally target-oriented, which wasmentioned by Jakobsen and Ursin [ 24] and allows one to reduce the computational cost of time-lapse inversion by focusing the inversion on the target-area only. This method is based on a new version of the distorted Born iterative T-matrix inverse scattering method. The Gaussian beam and T-matrix are used in this approach to perform the wavefield computation for the time-lapse inversion in the baseline model from the survey surface to the target region. We have provided target-oriented inversion results of the synthetic time-lapse waveformdata, which shows that the proposed scheme reduces the computational cost significantly.
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