Journal
GEOTHERMICS
Volume 94, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.geothermics.2021.102065
Keywords
Resistivity; Fracture permeability; Tortuosity; Lattice Boltzmann method; Enhanced geothermal system; Permeability-formation factor relation
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Funding
- Japan Society for the Promotion of Science (JSPS) [JP19J10125, JP19K15100, JP20K20948]
- International Institute for Carbon Neutral Energy Research (I2CNER) - World Premier International Research Center Initiative of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
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By investigating the microscopic flow characteristics of fractures, a relationship between fracture permeability and formation factor was established, potentially allowing for monitoring of subsurface hydraulic activities at a larger scale through resistivity observations.
Geothermal systems consisting of fractures in impermeable rocks are difficult to characterize by in situ methods. In an effort to link characteristics of small-scale and large-scale fractures, this study investigated possible relations between their geophysical parameters. We upscaled the relationship between fracture permeability and formation factor in a laboratory specimen to larger fracture dimensions. Microscopic flow characteristics indicate that this relationship is related to the tortuosity of flow paths. We derived an empirical formula that directly predicts changes in fracture permeability from changes in formation factor. This relation may make it possible to monitor subsurface hydraulic activities through resistivity observations.
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