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Advances On Electro-Magnetic Imaging for De-Risking Enhanced Geothermal Systems ProspectsNormal access

Authors: M. Darnet, C. Dezayes, J. Girard, J. Baltassat, F. Bretaudeau, T. Reuschlé, N. Coppo, J. Porte and Y. Lucas
Event name: First EAGE/IGA/DGMK Joint Workshop on Deep Geothermal Energy
Session: New Approaches, Drilling and Risks
Publication date: 08 November 2018
DOI: 10.3997/2214-4609.201802935
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.33Mb )
Price: € 20

Exploiting deep geothermal resources in rifts or in flexural basins to produce electricity is now possible because of the development of Enhanced Geothermal System (EGS) technology. To do so, the presence of fluid and sufficient permeability is necessary to allow the production and re-injection of the fluid. This translates into the reservoir being located in the deep layers of sedimentary basins and the upper part of the basement, including the transition zone between the two. The reality is however even more complex as the geothermal potential of this zone is also strongly influenced its hydrothermal and tectonic history. It is therefore clear that the characterization of this transition zone and its heterogeneity constitutes one of the most challenging problems for the development of geothermal resources. Within the frame of several national and European research projects, we have undertaken to develop geophysical techniques capable of imaging the electrical resistivity of the transition zone, as this physical parameter is highly sensitive to the presence of geothermal fluids and associated hydrothermal alterations. In this paper, we report out our analysis of core, well and field-scale resistivity measurements to establish the feasibility of electro-magnetic imaging for de-risking EGS prospects.

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