Mechanism and development model of karst reservoir in the Wumishan Formation in Xiong'an New Area
GUO Ruijing1,2, JI Youliang1,2, MA Zhengtao1,2, WAN Hongfeng1,2, YANG Dongji1,2, JI Hancheng1,2, BAO Zhidong1,2, ZHOU Yong1,2, FANG Chao1,2, LU Kai1,2, LIU Jinxia3
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China; 2 State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China; 3 Sinopec Star Petroleum Co. Ltd.,Beijing 100083,China
Abstract：There are abundant geothermal resources in the Wumishan Formation of Xiong'an New Area. Studying the characteristics and main controlling factors of high-quality karstic geothermal reservoirs in the Wumishan Formation is the foundation of the geothermal resources exploration. Previous work has analyzed the distribution,diagenesis,reservoir space of the karst reservoir of the Wumishan Formation. However, there are limited work has been carried to understand the reservoir mechanism,especially for karst characteristics of three different stages. We analyzed the diagenesis types and the transformation mechanism of the Wumishan Formation in study area,based on field outcrops core data,thin section and logging data. The results show that: (1)The main lithology in the study area is dolomite,and the main storage spaces are secondary pores and structural-dissolution cracks. (2)The most constructive diagenesis is epigenetic dissolution,the most destructive diagenesis is compaction and cementation. (3)We divide epigenetic dissolution into three stages: including Qinyu stage,Indosinian stage and Yanshanian-Himalayan stage. Local outcrops of the Wumishan Formation during the Qinyu Movement were leached,however,the formed dissolved pores are not easy to identify after later rework. During Indosinian movement,most of study areas were uplifted and leached,which were further reworked. The Yanshanian-Himalayan period was the epigenetic karstification with the largest scale and the most extensive influence in the study area,which further leached and reworked the earlier reservoirs to form large-scale high-quality reservoirs. Finally,we raised the formation mechanism and model of high-quality karst thermal storage in the Wumihsan formation in Xiong'an New Area,and pointed out the favorite area of karst reservoir.
GUO Ruijing,JI Youliang,MA Zhengtao et al. Mechanism and development model of karst reservoir in the Wumishan Formation in Xiong'an New Area[J]. JOPC, 2023, 25(1): 180-197.
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