scholarly journals Permeable fracture zones in the hard rocks of the geothermal reservoir at Rittershoffen, France

2017 ◽  
Vol 122 (7) ◽  
pp. 4864-4887 ◽  
Author(s):  
J. Vidal ◽  
A. Genter ◽  
F. Chopin
Keyword(s):  
Geothermal Reservoir ◽  
Fracture Zones ◽  
Hard Rocks

scholarly journals FluidRock Interactions in a Paleo-Geothermal Reservoir (Noble Hills Granite, California, USA). Part 2: The Influence of Fracturing on Granite Alteration Processes and Fluid Circulation at Low to Moderate Regional Strain

Geosciences ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 433
Author(s):  
Johanne Klee ◽  
Arezki Chabani ◽  
Béatrice A. Ledésert ◽  
Sébastien Potel ◽  
Ronan L. Hébert ◽  
...  
Keyword(s):  
Geothermal Reservoir ◽  
Death Valley ◽  
Distribution Analysis ◽  
Fracture Density ◽  
Fracture Zones ◽  
Rock Interaction ◽  
Interaction Processes ◽  
Regional Strain ◽  
Alteration Processes ◽  
Fracture Distribution

Fracture connectivity within fractured granitic basement geothermal reservoirs is an important factor controlling their permeability. This study aims to improve the understanding of fluid–rock interaction processes at low to moderate regional strain. The Noble Hills range (Death Valley, CA, USA) was chosen as a naturally exhumed paleo geothermal reservoir. A series of petrographic, petrophysical, and geochemical investigations, combined with a fracture distribution analysis, were carried out on samples collected across fracture zones. Our results indicate that several generations of fluids have percolated through the reservoir. An increase of (1) the alteration degree; (2) the porosity values; and (3) the calcite content was observed when approaching fracture zones. No correlation was identified among the alteration degree, the porosity, or the calcite content. At a local scale, samples showed that the degree of alteration does not necessarily depend on the fracture density or on the amount of the strain. It is concluded that the combined influence of strain and coeval fluid–rock interaction processes drastically influence the petrophysical properties of fracture zones, which in turn impact geothermal production potential.

scholarly journals Integrating gamma log and conventional electrical logs to improve identification of fracture zones in hard rocks for hydrofracturing: a case study from Ghana

2016 ◽  
Vol 7 (3) ◽  
pp. 1091-1098 ◽  
Author(s):  
E. O. Amartey ◽  
T. T. Akiti ◽  
T. Armah ◽  
S. Osae ◽  
W. A. Agyekum
Keyword(s):  
Fracture Zones ◽  
Hard Rocks

RESEARCH OF SURFACTANT SOLUTIONS FILTRATION IN HARD ROCKS

2018 ◽  
Vol 6 ◽  
pp. 18-27
Author(s):  
jO.G. LATYSHEV ◽  
Keyword(s):  
Hard Rocks ◽  
Surfactant Solutions

Near-Surface Geothermal Reservoir Imaging based on the Customized Dense Seismic Network

2021 ◽  
Author(s):  
Changjiang Zhou ◽  
Jianghai Xia ◽  
Jingyin Pang ◽  
Feng Cheng ◽  
Xinhua Chen ◽  
...  
Keyword(s):  
Seismic Network ◽  
Geothermal Reservoir ◽  
Near Surface
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