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Seismic Exploration of a Deep, Possibly Super-critical, Hydrothermal Reservoir in the Larderello AreaNormal access

Authors: W. Rabbel, S. Buske, T. Jusri, D. Köhn, J. Lehr, H.B. Motra, L. Schreiter, M. Thorwart and The DESCRAMBLE Working Group
Event name: 81st EAGE Conference and Exhibition 2019 Workshop Programme
Session: WS09 Exploration and Monitoring of Geothermal Reservoirs
Publication date: 03 June 2019
DOI: 10.3997/2214-4609.201901960
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 182.28Kb )
Price: € 20

Summary:
The K-Horizon is a well-known seismic reflection structure of regional extent in the Larderello area. The geological nature of the K-Horizon is unknown though. It is supposed to be a geothermal reservoir where supercritical conditions could to be possible (~450°C temperature). We demonstrate the principally high potential of 3D seismic imaging and inversion for characterizing location and structure of deep reservoir. Depth uncertainties can be strongly reduced by incorporating vertical seismic profiling, lab and field studies of seismic anisotropy and numerical thermal modeling in the interpretational procedure. The K-Horizon seems to represent a pair of thin alternating high- and low-velocity-zones, the uppermost of which can be identified with a drilled dry zone of strongly decreased strength.


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