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--- et_geothermal [05/07/2023 15:05] – mike_gss
+++ et_geothermal [05/07/2023 15:06] (current) – mike_gss
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-The Margretheholm Geothermal Plant near Copenhagen (see photo above; image - Peter Warna-Moors, GEUS) began functioning in 2005. It uses water from the Bunter Sandstone Formation which is 2.6 km deep where water is ca. 73ºC. The overburden includes the Upper Cretaceous chalks (see seismic image below) but the nature of these is poorly understood. A biostratigraphic breakdown of the chalk of the Margretheholm-1 geothermal well was carried out using calcareous nannofossils (see nannofossil biostrat image below - after Kristensen et al., 2017 and fossil photos after Sheldon, 2008). It was the first time a detailed combined bio-, litho- and log stratigraphic study had been conducted on a deep well penetrating all of the Upper Cretaceous section onshore Denmark, providing important correlation with other local and regional boreholes (see correlation image below - after Kristensen et al., 2017), increasing understanding of the regional geology, which is crucial for current and future geothermal energy development.
+The Margretheholm Geothermal Plant near Copenhagen (see photo above; image - Peter Warna-Moors, GEUS) was built in 2005. It uses water from the Bunter Sandstone Formation which is 2.6 km deep where water is ca. 73ºC. The overburden includes the Upper Cretaceous chalks (see seismic image below) but the nature of these is poorly understood. A biostratigraphic breakdown of the chalk of the Margretheholm-1 geothermal well was carried out using calcareous nannofossils (see nannofossil biostrat image below - after Kristensen et al., 2017 and fossil photos after Sheldon, 2008). It was the first time a detailed combined bio-, litho- and log stratigraphic study had been conducted on a deep well penetrating all of the Upper Cretaceous section onshore Denmark, providing important correlation with other local and regional boreholes (see correlation image below - after Kristensen et al., 2017), increasing understanding of the regional geology, which is crucial for current and future geothermal energy development.
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