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

ABSTRACT This paper deals with the design, acquisition and processing of vertical seismic profiling 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‐abandon...

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Bibliographic Details
Published in:Geophysical Prospecting 2020-05, Vol.68 (4), p.1139-1153
Main Authors: Guglielmetti, L., Poletto, F., Corubolo, P., Bitri, A., Dezayes, C., Farina, B.M., Martin, F., Meneghini, F., Moscariello, A., Nawratil de Bono, C., Schleifer, A.
Format: Article
Language:English
Subjects:
Abandoned wells
Acquisition
Applied geology
Borehole geophysics
Carbonate reservoir
Carbonates
Earth Sciences
Environmental Sciences
Exploration
Geology
Geothermal
Geothermal exploration
Geothermal resources
Mesozoic
Profiling
Sciences of the Universe
Sediments
Seismic surveys
Seismics
Surveying
Surveys
Tertiary
Vertical seismic profiling
Walk‐above
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Summary:ABSTRACT This paper deals with the design, acquisition and processing of vertical seismic profiling 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 vertical seismic profiling surveys in support of the geothermal exploration campaigns in the area. This study has demonstrated the value of vertical seismic profiling 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.
ISSN:0016-8025
1365-2478
DOI:10.1111/1365-2478.12912