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<p>The potential for mitigating climate change through intense geothermal development of the shallow subsurface so far remains widely unexploited. Concerns about negative effects on the groundwater chemistry are often stated as an obstacle, although for high-temperature (HT) range systems (≤ 90 °C) this is largely based on relatively simple laboratory experiments.</p><p>The compilation of (un)published laboratory and field data for Pleistocene and upper Tertiary unconsolidated sediments provides an initial empirical database for this discussion. Therein, concentration ranges of the main dissolved components at natural (10 °C) and elevated (25, 40, 70 °C) temperatures each show greater natural variability than temperature-induced changes, except for&#xa0;K, Si and OC.</p><p>As expected from accompanying batch tests, Si<sub>diss.</sub> and DOC exceeded baseline concentrations in a&#xa0;cyclic HT aquifer thermal energy storage field test (≤ 80 °C). However, the hydrochemically modified plume remained limited to &lt; 30 m downstream from the ‘warm’ well throughout the whole (post)operational monitoring period.</p><p>Regarding groundwater quality, in future this empirical data basis must be expanded to trace components and other aquifer types such as sediments richer in C<sub>org</sub>.</p>

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Geostatistischer Datensatz zur Temperaturauswirkung (0–80 °C) auf die Hydrochemie pleistozäner Grundwasserleiter – Labor- und Feldexperimente für gelöste Hauptkomponenten

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月24日

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  • Klas Lüders,
  • Götz Hornbruch,
  • Ralf Köber,
  • Markus Ebert,
  • Andreas Dahmke

摘要

The potential for mitigating climate change through intense geothermal development of the shallow subsurface so far remains widely unexploited. Concerns about negative effects on the groundwater chemistry are often stated as an obstacle, although for high-temperature (HT) range systems (≤ 90 °C) this is largely based on relatively simple laboratory experiments.

The compilation of (un)published laboratory and field data for Pleistocene and upper Tertiary unconsolidated sediments provides an initial empirical database for this discussion. Therein, concentration ranges of the main dissolved components at natural (10 °C) and elevated (25, 40, 70 °C) temperatures each show greater natural variability than temperature-induced changes, except for K, Si and OC.

As expected from accompanying batch tests, Sidiss. and DOC exceeded baseline concentrations in a cyclic HT aquifer thermal energy storage field test (≤ 80 °C). However, the hydrochemically modified plume remained limited to < 30 m downstream from the ‘warm’ well throughout the whole (post)operational monitoring period.

Regarding groundwater quality, in future this empirical data basis must be expanded to trace components and other aquifer types such as sediments richer in Corg.