Flux of4He from Carnmenellis granite: modelling of an HDR geothermal reservoir |
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| Institution: | 1. Geology Department, Faculty of Applied Science, Taiz University, 6803, Taiz, Yemen;2. Department of Earth and Environmental Sciences, Bahria University, Islamabad, 44000, Pakistan;3. Geology and Geophysics Department, College of Science, King Saud University, Riyadh, Saudi Arabia;4. University of Regina, Department of Geology, 3737 Wascana Parkway, Regina, SK, S4S 0A2, Canada;1. School of Geoscience, China University of Petroleum (Qingdao), 266580, China;2. Mewbourne School of Petroleum & Geological Engineering, University of Oklahoma, Norman, OK, 73019, USA;3. Shanghai Branch Company, CNOOC Ltd, 200030, China;4. China Oilfield Service Limited, Langfang, 065200, China;1. Telesto Energy Pte Ltd, Singapore;2. Indian Institute of Technology (ISM), Dhanbad, India;3. Department of Geosciences, UT Permian Basin, Odessa, TX, USA;4. Department of Geology, University of Kansas, Lawrence, KS, USA;5. BBA Engineering and Geoscience LLC, Bertram, TX, USA;6. Ikon Science Ltd., Midland, TX, USA;7. University of Petroleum and Energy Studies, Dehradun, India;1. Geology Department, Faculty of Applied Science, Taiz University, 6803, Taiz, Yemen;2. Petroleum and Natural Gas Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh, 11421, Saudi Arabia;3. Geology Department, Faculty of Science, Benha University, P.O. Box 13518, Benha, Egypt;4. Department of Geology, College of Science, University of Sulaimani, Kurdistan, Iraq;5. Department of Geology and Geophysics, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia;6. Mining and Petroleum Engineering Department, Faculty of Engineering, Al-Azhar University, Cairo, Egypt |
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| Abstract: | The diffusion coefficient (D) of He in the Carnmenellis granite, recovered from the Rosemanowes hot dry rock (HDR) geothermal reservoir, is experimentally determined in the laboratory in a temperature range of 100–300°C. Temperature variation of D fits an Arrhenius plot, but yields an activation energy for He release from rock significantly lower than the value for feldspar or quartz, suggesting that most of the He in the reservoir granite resides within grain boundaries and jointing cement and may be easily released.The reservoir surface area (S) is estimated based on the laboratory determined value of D from granite and the measured4He contents of circulation fluids from RH 15 well. In the first year of reservoir circulation,4He-based reservoir surface area was about twice that based on222Rn. It increased and stabilized at about 6 times after 2 a. The excess He release from newly opened up fracture surfaces within the reservoir during its expansion is shown to be responsible for the temporal increase in the He-based reservoir surface area over that of Rn. |
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