Evolution and main controlling factors of the Ordovician karst thermal reservoir in western Shandong-eastern Henan area
SUI Shaoqiang1,2, YANG Zhibo3,4, ZHAO Yajing3,4, JIA Yanyu1,2, SU Yuchi3,4, WANG Xi1,2, GAO Fei1,2, JI Hancheng3,4, BAO Zhidong3,4
1 SINOPEC Star(Beijing)New Energy Research Institute Co. Ltd.,Beijing 100083,China; 2 Key Laboratory of Geothermal Exploration and Utilization,SINOPEC,Beijing 100083,China; 3 National Key Laboratory of Petroleum Resource and Engineering,China University of Petroleum(Beijing),Beijing 102249,China; 4 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China
Abstract：There are abundant geothermal resources in Ordovician carbonate rocks in the Western Shandong-Eastern Henan Area,but the characteristics and main controlling factors of thermal storage are still unclear. In this paper,geological and geophysical data from outcrops,cores,thin sections,and wells are integrated to investigate the characteristics of the karst thermal reservoirs,evolution processes,and formation of geothermal fields in Ordovician carbonate rocks. The results show that the main reservoir lithologies of the Ordovician in the study area are grainstone,carbonate breccia,calcareous dolostone,crystalline dolostone and siliceous limestone. The residual thickness of the uplifted area is about 500~1000 m,and the average porosity is 2.76%,whereas the residual thickness of the depression area is about 0~500 m,and the average porosity is 2.22%. Compared with the depression area,the residual thickness of the uplifted area is relatively large,and the pore penetration is relatively large;the influence of the Lanlao fracture is obvious,and the “uplift-depression”is distributed in a ring-like pattern. The karst thermal reservoirs experienced a comprehensive transformation by cementation,dolomitization,compaction,compressional solution,dissolution,filling,recrystallization,and tectonic rupture. The karst thermal reservoirs mainly underwent augmentation during the early orogenic period(early-middle Ordovician),during the epigenetic period(late Ordovician-early Carboniferous),during the middle-late burial period(late Carboniferous-early Triassic),and during the epigenetic period(middle Cenozoic,mainly developed in the Heze uplift). The lithology,diagenesis and tectonic stresses controlled the formation and evolution of the Ordovician karst thermal reservoirs in the study area. Analysis of the geothermal source-storage-cover base conditions has clarified the fluid circulation characteristics and geothermal resource prediction of the Ordovician karst thermal reservoirs in the study area.
SUI Shaoqiang,YANG Zhibo,ZHAO Yajing et al. Evolution and main controlling factors of the Ordovician karst thermal reservoir in western Shandong-eastern Henan area[J]. JOPC, 2023, 25(6): 1364-1378.
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