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Advanced Seismic Imaging Techniques for Characterization of a Deep Supercritical Geothermal ReservoirNormal access

Authors: T. Jusri, R. Bertani and S. Buske
Event name: 80th EAGE Conference and Exhibition 2018
Session: Poster: Seismic Imaging - Case Histories B
Publication date: 11 June 2018
DOI: 10.3997/2214-4609.201801653
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.02Mb )
Price: € 20

Summary:
Seismic exploration of geothermal reservoirs in deep metamorphic rocks requires more advanced techniques compared to common exploration cases such as in sedimentary rocks. We present an advanced seismic depth imaging technique in term of Fresnel Volume Migration (FVM), and applied this technique to the case of geothermal exploration in the deep metamorphic rocks of Southern Tuscany. We have found that FVM has been able to reveal seismic reflections of the geothermal reservoir boundary with high coherency. This work might have provided the first seismic images of the geothermal reservoir in the area with such high resolution, and has contributed to improve our interpretation of the geothermal reservoir from the previous seismic studies conducted in the area. Furthermore, our attempts to characterize the geothermal reservoir using Amplitude Versus Offset (AVO) analysis has guided us to an expectation for the presence of reservoir fluids with anomalously high temperature and pressure. The results of this work have also provided important information for steering the first well to reach the geothermal reservoir in the study area, and have served as a basis for the characterization of the geothermal reservoir.


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