Characteristics,main controlling factors and favorable area prediction of karstic geothermal reservoirs of the Jixianian Wumishan Formation in Xiong’an New Area
Lu Kai1,2, Bao Zhi-Dong1,2, Ji Han-Cheng1,2, Liu Jin-Xia3, Wang Gui-Ling4, Ma Feng4, Guo Rui-Jing1,2, Cao Ying-Zhuo1,2, Yang Fei5, Fu Yong1,2, Li Xiao-Bo1,2, Hua Ying-Xin1,2, Que Yi-Juan1,2, Li Zong-Feng1,2, Xu Xi-Ting1,2, Hu Xian-Cai4
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; 4 Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences,Shijiazhuang 050061,China; 5 Exploration and Development Research Institute,Sinopec Zhongyuan Oilfield Company,Zhengzhou 450046,China
Abstract There are abundant geothermal resources in the Jixianian Wumishan Formation of Xiong’an New Area. To study the characteristics and main controlling factors of high-quality karstic geothermal reservoirs in the Wumishan Formation is the basis of the exploration of geothermal resources. The geological and geophysical data, including outcrops,cores,thin sections,drilling and logging,are utilized to study of the characteristics and evolution process of karstic geothermal reservoirs in the Wumishan Formation. The aim of this article is to clarify the controlling factors of formation and development of high-quality geothermal reservoirs,and to predict the favorable target areas. The results indicate that the main lithologies of the karstic geothermal reservoirs in the Wumishan Formation are grain dolomite,granular dolomite,microbial dolomite,siliceous dolomite and breccia dolomite. The main reservoir spaces are caves,vuggy pores and fractures. The average porosity of the geothermal reservoirs in the Wumishan Formation is 3.18%,and the average permeability is 91.48 ×10-3μm2 . Among them,the breccia has the best petrophysical properties. The karstic geothermal reservoirs of the Wumishan Formation mainly experienced five stages of evolution including sedimentation-penecontemporaneous pore formation(Jxw),epigenic karstic stage Ⅰ(after Jxw-before Qb),burial stage Ⅰ(before Qb-T),epigenic karstic stage Ⅱ(T-E)and burial stageII(N-Q).The lithologies and lithofacies,diagenesis and tectonic stress are the main controlling factors for the formation of favorable karstic geothermal reservoirs in the Wumishan Formation. The most potential areas of the karstic geothermal reservoirs in the study area are located at regions characterized as the algal dolomitic flat-dolomitic flat,the epigenic karst,the buried karst,the penecontemporaneous karst,the karst platform-slope and the thickness ratio between fractures and the Wumishan Formation larger than 0.4.
Fund:Financially supported by the National Key Research and Development Programs of China(Nos. 2018YFC0604304,2017YFC0603104)
Corresponding Authors:
Bao Zhi-Dong,professor,born in 1964,graduated from University of Petroleum in 1993 with his doctoral degree. He is mainly engaged in researches on sedimentology,reservoir geology and hydrocarbon and geothermal accumulation and evaluation. E-mail: baozhd@cup.edu.cn.
About author: Lu Kai,born in 1990,is a doctoral candidate of China University of Petroleum(Beijing). Now he is mainly engaged in research on carbonate sedimentation and reservoirs. E-mail: kailu_1234@163.com.
Cite this article:
Lu Kai,Bao Zhi-Dong,Ji Han-Cheng et al. Characteristics,main controlling factors and favorable area prediction of karstic geothermal reservoirs of the Jixianian Wumishan Formation in Xiong’an New Area[J]. JOPC, 2019, 21(6): 885-900.
Lu Kai,Bao Zhi-Dong,Ji Han-Cheng et al. Characteristics,main controlling factors and favorable area prediction of karstic geothermal reservoirs of the Jixianian Wumishan Formation in Xiong’an New Area[J]. JOPC, 2019, 21(6): 885-900.
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