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Title: Three-dimensional geologic mapping to assess geothermal potential: examples from Nevada and Oregon

Journal Article · · Geothermal Energy
 [1];  [2];  [2];  [2];  [2];  [2]
  1. U.S. Geological Survey, Menlo Park, CA (United States); DOE/OSTI
  2. Univ. of Nevada, Reno, NV (United States)

Geologic structure plays an important role in controlling fluid flow in geothermal systems. In particular, very complex structural settings, consisting of many closely spaced and intersecting faults, host many geothermal systems. To elucidate the key geologic factors that affect fault-controlled geothermal circulation, it is critical to precisely characterize the structural and stratigraphic geometries in these complex settings. Here, we present a methodology and the results of 3D geologic analyses of two geothermal systems in the Basin and Range, USA. This methodology is a quantitative and geologically focused technique that can be used to precisely characterize geothermal areas, in a time when future geothermal growth demands increased exploration precision and efficiency. Surficial and subsurface geologic and geophysical data are synthesized in the construction of detailed 3D geologic maps of geothermal areas. Based on these 3D geologic maps, we examine several geologic attributes that control permeability development and geothermal fluid flow along faults. We use the stress state of faults and the distribution of structural discontinuities (i.e., fault intersections and fault terminations) to identify locations of upflow along faults in these geothermal systems. These results and the methodology presented herein are directly applicable to structurally controlled geothermal fields in the Basin and Range and worldwide. As development focus shifts toward blind geothermal resources, integration of precisely characterized subsurface structural information into exploration methods will be increasingly critical to continued growth in geothermal exploration and development.

Research Organization:
Univ. of California, Oakland, CA (United States); Univ. of Nevada, Reno, NV (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
AC02-05CH11231; EE0002748; FG36-02ID14311
OSTI ID:
1613266
Journal Information:
Geothermal Energy, Journal Name: Geothermal Energy Journal Issue: 1 Vol. 7; ISSN 2195-9706
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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