Geothermal resource exploration is generally limited to areas with surface expressions of thermal activity (fumaroles and hot springs), or relies on expensive geophysical exploration techniques. In this study, the hidden subsurface distribution of geothermal fluids has been identified using a free and publicly available water quality dataset from agricultural and domestic water wells in Surprise Valley, northeastern California. Thermally evolved waters in Surprise Valley have element ratios that vary in response to Ca carbonate and Mg silicate mineral precipitation, and have elevated total dissolved solids (TDS). The arid climate in Surprise Valley leads to surface water evaporation in a closed basin, producing high TDS Na-Cl-CO3-SO4 brines in three ephemeral alkali lakes and in shallow groundwater under elevated soil CO2 conditions. Evaporated fluids in Surprise Valley follow a chemical divide that leads to Ca carbonate and Mg silicate mineral precipitation. Plots of dissolved element ratios can be used to distinguish groundwater affected by evaporation from water affected by thermal water-rock interaction, however it is challenging to select components for plotting that best illustrate different fluid evolution mechanisms. Here, we use a principal component analysis of centered log-ratio transformed data, coupled with geochemical models of fluid evaporation and thermal mixing pathways, to identify components to plot that distinguish between groundwater samples influenced by evaporation from those influenced by thermal processes. We find that groundwater samples with a thermal signature come from wells that define a coherent, linear geographical distribution that closely matches the location of known and inferred faults. Modification of the general approach employed here provides promise for identifying blind geothermal resources in other locations, by applying low-cost geochemical modeling and statistical techniques to areas where large groundwater quality geochemical datasets are available.
Bibliographical noteFunding Information:
This work was supported in part by the Assistant Secretary for Energy Efficiency and Renewable Energy, Geothermal Technologies Office, of the U.S. Department of Energy under the U.S. Department of Energy Contract No. DE-AC02-05CH11231 with Lawrence Berkeley National Laboratory. The authors would like to thank anonymous reviewers for their insightful comments and suggestions. All data for this paper is properly cited and referred to in the reference list. The data necessary to reproduce this work are included as supplementary files. Any additional data or source files are available from the authors upon request (firstname.lastname@example.org).
© 2017 Elsevier Ltd
- Blind geothermal resources
- Fluid mixing
- Geochemical modeling
- Surprise valley