摘要
Geothermal energy plays an important role in urban construction of the Xiong’an New Area. Geothermal reservoir fracture distribution of the Mesoproterozoic Jixianian Wumishan Formation(Fm.) carbonate reservoir in the Rongcheng geothermal field are evaluated based on FMI log from Wells D19 and D21. The results show carbonate reservoir fracture density of Well D19 is 15.2/100 m, greater than that of Well D21 with a value of 9.2/100 m. Reservoir porosity and permeability of Well D19 are better than that of Well D21, and the water saturation is bimodally distributed. The movable fluid volume ratio(BVM) of Well D19 is 2% to 8% with some zones exceeding 20%, while the value of Well D21 is less than 4%. Therefore, reservoir fractures in Well D19 are more conducive to fluid flow. Reservoir fractures have a similar occurrence to normal faults, indicating that the tensile stress field controlled the formation of such fractures. Developed reservoir fractures provide a good channel for groundwater convection. The circulation of regional groundwater and the heat exchange between water and rock and the multiple heat accumulation patterns form a stable and high potential heat reservoir in the Rongcheng geothermal field.
基金
funded by the National Key R&D Program of China(Grant No.2019YFB1504101)
the China Postdoctoral Science Foundation(Grant No.2019M663087)
the National Natural Science Foundation of China(Grant No.42002189)。
作者简介
WANG Yingjin,male,bom in 1991 in Weihai City,Shandong Province,Ph.D.,graduated from the School of Energy Resources,China University of Geosciences,Beijing.Now conducting postdoctoral research in the Institute of Deep Earth Sciences and Green Energy,College of Civil and Transportation Engineering,Shenzhen University.His main research focuses on unconventional petroleum geology,geothermal exploration and rock mechanics.E-mail:wangyingjin@szu.edu.cn,623490067@qq.com,phone:15650766501;Corresponding author:MA Feng,male,bom in 1983 in Pingyao County,Shanxi Province,Ph.D.,graduated from the School of Water Resources&Environment,China University of Geosciences,Beijing.He is a senior engineer in the Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences.He is now engaged in geothermal resources exploration and evaluation and fracture seepage heat transfer research.E-mail:mafeng@mail.cgs.gov.cn,phone:18630180690.
