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Title

Results of a walk‐above VSP survey acquired at the Thônex‐01 geothermal well (Switzerland) to delineate fractured carbonate formations for geothermal development

Authors
Poletto, F.
Corubolo, P.
Bitri, A.
Dezayes, C.
Farina, B.M.
Martin, F.
Meneghini, F.
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Published in Geophysical Prospecting. 2020
Abstract This paper deals with the design, acquisition and processing of vertical seismic profiling (VSP) data collected in 2016 at the directional Thônex-01 geothermal well, drilled in 1993 in the Geneva Canton (Switzerland). The aim of the study was to obtain additional information from existing-abandoned well for downhole geophysical characterization of potential geothermal reservoirs in the Geneva area. The main results obtained by this study allowed an improved subsurface image by multi-offset acquisitions near and around the deviated well. Specifically we were able to 1) improve the velocity model of the Geneva Basin, which, at present, is only constrained by one unique deep exploration well, located at the south-west of the basin, far away from the study area; 2) image the transition between the Tertiary Molasse siliciclastic sediments and the Mesozoic carbonates; 3) define an acquisition strategy for future VSP surveys in support of the geothermal exploration campaigns in the area. This study has demonstrated the value of VSP method for the refinement of the subsurface geology at local scale, and its usefulness to assist the planning of second well associated with geothermal doublets.
Keywords Vertical seismic profilingWalk-aboveGeothermalCarbonate reservoir
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Structures
Research group Reservoir Geology and Sedimentary Basin Analyses
Project Innosuisse GECOS
Citation
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GUGLIELMETTI, Luca et al. Results of a walk‐above VSP survey acquired at the Thônex‐01 geothermal well (Switzerland) to delineate fractured carbonate formations for geothermal development. In: Geophysical Prospecting, 2020. doi: 10.1111/1365-2478.12912 https://archive-ouverte.unige.ch/unige:127901

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Deposited on : 2019-12-16

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