Geothermal Energy

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Table 1 Average connected porosity, average grain diameter, average grain aspect ratio, average grain circularity, average grain roundness, and specific surface area for each of the twelve sandstones sampled from exploration well EPS-1 at the Soultz-sous-Forêts geothermal site (Alsace, France)

From: Microstructural and petrophysical properties of the Permo-Triassic sandstones (Buntsandstein) from the Soultz-sous-Forêts geothermal site (France)

Box number	84	100	157	198	248	299	347	402	453	497	508	540
Depth (m)	1008	1022	1069	1107	1151	1197	1239	1290	1336	1376	1386	1414
Stratigraphic unit	Voltzia	Intermédiaires	Karlstal	Karlstal	Karlstal	Rehberg	Rehberg	Trifels	Trifels	Annweiler	Annweiler	Anté-Annweiler
Average connected porosity	0.096	0.065	0.117	0.097	0.144	0.130	0.185	0.131	0.189	0.034	0.082	0.075
Average grain diameter (µm)	142	306	424	192	294	332	367	259	361	291	199	379
Average grain aspect ratio	1.54	1.61	1.71	1.71	1.69	1.68	1.65	1.67	1.65	1.71	1.59	1.76
Average grain circularity	0.79	0.75	0.71	0.73	0.72	0.74	0.71	0.71	0.71	0.71	0.77	0.69
Average grain roundness	0.67	0.65	0.62	0.63	0.63	0.64	0.64	0.64	0.65	0.73	0.66	0.61
Specific surface area (m²/kg)	1442	665	204	1485	1175	1888	1098	1349	1174	2024	2777	6170

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