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Time-lapse resistivity imaging: CSEM-data 3-D double-difference inversion and application to the Reykjanes geothermal field

Abstract : Time-lapse resistivity tomography bring valuable information on the physical changes occurring inside a geological reservoir. In this study, resistivity monitoring from controlled source electromagnetics (CSEM) data is investigated through synthetic and real data. We present three different schemes currently used to perform time-lapse inversions and compare these three methods: parallel, sequential and double difference. We demonstrate on synthetic tests that double difference scheme is the best way to perform time-lapse inversion when the survey parameters are fixed between the different time-lapse acquisitions. We show that double difference inversion allows to remove the imprint of correlated noise distortions, static shifts and most of the non-linearity of the inversion process including numerical noise and acquisition footprint. It also appears that this approach is robust against the baseline resistivity model quality, and even a rough starting resistivity model built from borehole logs or basic geological knowledge can be sufficient to map the time-lapse changes at their right positions. We perform these comparisons with real land time-lapse CSEM data acquired one year apart over the Reykjanes geothermal field.
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https://hal-brgm.archives-ouvertes.fr/hal-03745644
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Soumis le : jeudi 4 août 2022 - 14:02:30
Dernière modification le : jeudi 4 août 2022 - 14:28:54

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François Bretaudeau, Frédéric Dubois, S-G Bissavetsy Kassa, Nicolas Coppo, Pierre Wawrzyniak, et al.. Time-lapse resistivity imaging: CSEM-data 3-D double-difference inversion and application to the Reykjanes geothermal field. Geophysical Journal International, Oxford University Press (OUP), 2021, 226 (3), pp.1764-1782. ⟨10.1093/gji/ggab172⟩. ⟨hal-03745644⟩

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