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Experimental fracture sealing in reservoir sandstones and its relation to rock texture

Busch, Benjamin ORCID iD icon 1; Okamoto, Atsushi; Garbev, Krassimir ORCID iD icon 2; Hilgers, Christoph ORCID iD icon 1
1 Institut für Angewandte Geowissenschaften (AGW), Karlsruher Institut für Technologie (KIT)
2 Institut für Technische Chemie (ITC), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

Faults and fractures are important fluid pathways in subsurface energy reservoirs. Especially in geothermal
energy production, hydrocarbon production, and energy storage in the subsurface, fractures can enhance
reservoir quality and production or storage potential. However, mineral precipitations often reduce available
fracture apertures, and thus fracture porosity and permeability. Hydrothermal experimental setups, natural
samples, and numerical simulations have been studied to great extent. In fractured sandstones, the main focus
has been on only some controlling factors, e.g. fracture opening rate and the orientation of crystallographic axes
in substrates. Furthermore, substrates have mostly been fairly homogeneous or sediment textures have not been
explicitly considered. Here, fracture sealing experiments are performed on a homogeneous, massive marine
sandstone and heterogeneous, laminated fluvial sandstone. Hydrothermal flow-through experiments are performed
at 421 ± 1 ◦C and 30.5 ± 0.5 MPa for 72 h to compare resulting precipitated quartz cement textures on
fracture surfaces on natural sandstones. Results indicate a strong impact of grain size variations associated with
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Postprint §
DOI: 10.5445/IR/1000137624
Veröffentlicht am 15.09.2022
DOI: 10.1016/j.jsg.2021.104447
Zitationen: 8
Zitationen: 7
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Institut für Technische Chemie (ITC)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2021
Sprache Englisch
Identifikator ISSN: 0191-8141, 1873-1201
KITopen-ID: 1000137624
HGF-Programm 38.05.02 (POF IV, LK 01) Metals and Minerals Cycle
Erschienen in Journal of structural geology
Verlag Elsevier
Band 153
Seiten Art.-Nr.: 104447
Vorab online veröffentlicht am 14.09.2021
Schlagwörter Quartz precipitation, Structural diagenesis, Syntaxial fracture cementation, Fluid-rock interactions
Nachgewiesen in Scopus
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