Relatively stable pressure effects and time-increasing thermal contraction control Heber geothermal field deformation

Guoyan Jiang (), Andrew J. Barbour (), Robert J. Skoumal, Kathryn Materna, Joshua Taron and Aren Crandall-Bear
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Guoyan Jiang: Hubei Luojia Laboratory, Wuhan University
Andrew J. Barbour: US Geological Survey
Robert J. Skoumal: US Geological Survey
Kathryn Materna: US Geological Survey
Joshua Taron: US Geological Survey
Aren Crandall-Bear: University of Nevada

Nature Communications, 2024, vol. 15, issue 1, 1-14

Abstract: Abstract Due to geological complexities and observational gaps, it is challenging to identify the governing physical processes of geothermal field deformation including ground subsidence and earthquakes. In the west and east regions of the Heber Geothermal Field (HGF), decade-long subsidence was occurring despite injection of heat-depleted brines, along with transient reversals between uplift and subsidence. These observed phenomena contradict current knowledge that injection leads to surface uplift. Here we show that high-yield production wells at the HGF center siphon fluid from surrounding regions, which can cause subsidence at low-rate injection locations. Moreover, the thermal contraction effect by cooling increases with time and eventually overwhelms the pressure effects of pressure fluctuation and poroelastic responses, which keep relatively stable during geothermal operations. The observed subsidence anomalies result from the siphoning effect and thermal contraction. We further demonstrate that thermal contraction dominates long-term trends of surface displacement and seismicity growth, while pressure effects drive near-instantaneous changes.

Date: 2024
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DOI: 10.1038/s41467-024-49363-1

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