Description: Enhanced Geothermal Systems (EGS) utilize artificially induced fracture networks to enable fluid circulation and heat extraction from high-temperature, low-permeability geological formations. Unlike conventional hydraulic fracturing in the hydrocarbon industry—which commonly employs proppants to keep fractures open—EGS stimulation primarily relies on hydraulic shear stimulation. This technique leverages the self-propping behavior of pre-existing fractures, eliminating the need for proppants. To replicate hydraulic shear stimulation in a controlled laboratory setting, we conducted shear-flow experiments on various fracture types, including shear fractures, tensile fractures, and saw-cut fractures. Most previous studies have focused on tensile and saw-cut fractures, typically treating them as idealized representations of smooth or rough fracture surfaces. However, shear fractures—due to their naturally formed characteristics—offer a more realistic simulation of in-situ conditions and better represent pre-existing fractures in the field. To evaluate fracture surface roughness, we employed a 3D laser scanner. The digitized surface data, captured both before and after the shear-flow tests, were recorded in .CSV files for subsequent analysis.
Global identifier:
Doi(
"10.5880/GFZ.KHAG.2025.004",
)
Origins: /Wissenschaft/GFZ Data Services
Tags: Fracking ? Kohlenwasserstoff ? Laser ? Daten ? Permeabilität ? Studie ? Enhanced Geothermal Systems (EGS) ? Roughness > Root Mean Square ? Triaxial ? fracture permeability ? fracture type ? granodiorite ? hydraulic shearing treatments ? self-propping ? shear-flow test ?
License: cc-by/4.0
Language: Englisch/English
Issued: 2025-01-01
Time ranges: 2025-01-01 - 2025-01-01
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