Estimating the Permeability-Depth Relation of Slate Formation for Geothermal Project
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F25%3A00638931" target="_blank" >RIV/67985891:_____/25:00638931 - isvavai.cz</a>
Result on the web
<a href="http://hhttps://doi.org/10.1007/s00603-025-04590-w" target="_blank" >http://hhttps://doi.org/10.1007/s00603-025-04590-w</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s00603-025-04590-w" target="_blank" >10.1007/s00603-025-04590-w</a>
Alternative languages
Result language
angličtina
Original language name
Estimating the Permeability-Depth Relation of Slate Formation for Geothermal Project
Original language description
Slate formation is one of the potential geothermal sites in Taiwan. However, the fluid flow capability of slate formations has not been well investigated internationally. This study proposes a procedure to evaluate the permeability-depth relationship in slate formations. We used slate samples from the Hungyeh Formation in Taiwan to measure the permeability (k) of intact slate and the hydraulic aperture (e) of natural/artificial tensile fractures along the foliation, under confining pressures up to 60 MPa (similar to 3500 m depth). Stress-dependent models of permeability and hydraulic aperture were developed using a power law and an exponential function, respectively. The equivalent vertical permeability (k(v,eq)) of slate formation with fractures is calculated using Snow's model, which considers the aperture (e) and spacing (s) of vertical fractures subparallel to the foliation. The matrix permeability (< 0.001 mD) decreases with increasing depth. The k(v,eq) of the slate formation, contributed by fractures along the vertical foliation (assuming s = 1.0 m), is several tens of times greater than the intact slate permeability. Within the target depth range of 1500-1700 m, and assuming s = 0.2 m generated by hydraulic fracturing (HF), the mean k(v,eq) ranges from 3.0 x 10(-2) to 2.3 x 10(-2) mD under an injection pressure of 10 MPa. To enhance energy generation efficiency in slate formations, improving HF design to create denser fractures and identify fracture zones, is suggested. The proposed approach is a simple and feasible way to evaluate the permeability-depth relation of reservoirs for geothermal projects before the detailed site investigation program.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20701 - Environmental and geological engineering, geotechnics
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Rock Mechanics and Rock Engineering
ISSN
0723-2632
e-ISSN
1434-453X
Volume of the periodical
58
Issue of the periodical within the volume
8
Country of publishing house
DE - GERMANY
Number of pages
16
Pages from-to
8867-8882
UT code for WoS article
001480787100001
EID of the result in the Scopus database
2-s2.0-105004054045