Deep geothermal processes acting on faults and solid tides in coastal Xinzhou geothermal field, Guangdong, China

Guoping Lu, Xiao Wang, Fusi Li, Fangyiming Xu, Yanxin Wang, Shihua Qi, David Yuen

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

This paper investigated the deep fault thermal flow processes in the Xinzhou geothermal field in the Yangjiang region of Guangdong Province. Deep faults channel geothermal energy to the shallow ground, which makes it difficult to study due to the hidden nature. We conducted numerical experiments in order to investigate the physical states of the geothermal water inside the fault zone. We view the deep fault as a fast flow path for the thermal water from the deep crust driven up by the buoyancy. Temperature measurements at the springs or wells constrain the upper boundary, and the temperature inferred from the Currie temperature interface bounds the bottom. The deepened boundary allows the thermal reservoir to revolve rather than to be at a fixed temperature. The results detail the concept of a thermal reservoir in terms of its formation and heat distribution. The concept also reconciles the discrepancy in reservoir temperatures predicted from both quartz and Na-K-Mg. The downward displacement of the crust increases the pressure at the deep ground and leads to an elevated temperature and a lighter water density. Ultimately, our results are a first step in implementing numerical studies of deep faults through geothermal water flows; future works need to extend to cases of supercritical states. This approach is applicable to general deep-fault thermal flows and dissipation paths for the seismic energy from the deep crust.

Original languageEnglish (US)
Pages (from-to)76-88
Number of pages13
JournalPhysics of the Earth and Planetary Interiors
Volume264
DOIs
StatePublished - Mar 1 2017

Bibliographical note

Funding Information:
This work was partially supported from The 211 Teaching Startup Fund to the first author from China University of Geosciences, Wuhan, China Geological Survey Project (No. 1212011220014) Research and investigation of geothermal controlling geological structures in Pearl River delta and neighboring regions from Hydrogeology and Environmental Geology Division, and Natural Science Foundation of China NSFC Grant (No. 41572241). We express thanks to the help from Guangdong Provincial Hydrogeology Brigade and the editing work of the manuscript by Lawrence Lu and Lucinda Lu. The comments from the three anonymous reviewers and the editors have greatly improved the manuscript.

Publisher Copyright:
© 2017 Elsevier B.V.

Keywords

  • Circulation depth
  • Deep fault
  • Geothermal
  • Reservoir
  • Solid tide

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