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Transport mechanisms of hydrothermal convection in faulted tight sandstones

Yan, Guoqiang ORCID iD icon 1; Busch, Benjamin ORCID iD icon 1; Egert, Robert ORCID iD icon 1; Esmaeilpour, Morteza ORCID iD icon 1; Stricker, Kai ORCID iD icon 1; Kohl, Thomas 1
1 Institut für Angewandte Geowissenschaften (AGW), Karlsruher Institut für Technologie (KIT)

Abstract:

Motivated by the unknown reasons for a kilometre-scale high-temperature overprint of 270–300 ∘C in a reservoir outcrop analogue (Piesberg quarry, northwestern Germany), numerical simulations are conducted to identify the transport mechanisms of the fault-related hydrothermal convection system. The system mainly consists of a main fault and a sandstone reservoir in which transfer faults are embedded. The results show that the buoyancy-driven convection in the main fault is the basic requirement for elevated temperatures in the reservoir. We studied the effects of permeability variations and lateral regional flow (LRF) mimicking the topographical conditions on the preferential fluid-flow pathways, dominant heat-transfer types, and mutual interactions among different convective and advective flow modes. The sensitivity analysis of permeability variations indicates that lateral convection in the sandstone and advection in the transfer faults can efficiently transport fluid and heat, thus causing elevated temperatures (≥269 °C) in the reservoir at a depth of 4.4 km compared to purely conduction-dominated heat transfer (≤250 °C). Higher-level lateral regional flow interacts with convection and advection and changes the dominant heat transfer from conduction to advection in the transfer faults for the low permeability cases of sandstone and main fault. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000157386
Veröffentlicht am 17.04.2023
Originalveröffentlichung
DOI: 10.5194/se-14-293-2023
Scopus
Zitationen: 1
Web of Science
Zitationen: 1
Dimensions
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2023
Sprache Englisch
Identifikator ISSN: 1869-9510, 1869-9529
KITopen-ID: 1000157386
HGF-Programm 38.04.04 (POF IV, LK 01) Geoenergy
Erschienen in Solid Earth
Verlag Copernicus Publications
Band 14
Heft 3
Seiten 293–310
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 10.03.2023
Nachgewiesen in Web of Science
Dimensions
Scopus
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