In order to deepen the large-scale development and utilization of geothermal resources in the medium-deep depth of Xiong´an New Area, based on outcrop, core, rock thin sections, drilling data and seismic lines interpretation results, the characteristics of thermal reservoir petrology and reservoir space are analyzed, and the thermal reservoir sedimentary facies model, lithofacies palaeogeography, porosity and permeability distribution characteristics of Wumishan Formation of Jixian System of Mesoproterozoic in Xiong´an New Area are studied. Combined with tectonic evolution and types of thermal reservoir diagenesis, the development stages, karstification and distribution characteristics of karst palaeogeomorphology of Wumishan Formation thermal reservoir are analyzed. According to the main karst development layers, the controlling factors are clarified, and the characteristics of karst thermal reservoir of Wumishan Formation in Xiong´an New Area are defined. With consideration of the above which with geothermal gradient, fault distribution and hydrodynamic factors, the favorable exploration target area for Wumishan Formation karst thermal reservoir is selected in Xiong´an New Area. The research results show that the favorable lithology for thermal storage of Wumishan Formation of Jixian System in Xiong´an New Area is mainly stromatolite dolomite, algae clot dolomite and granular dolomite, algae-dolomite tidal flat microfacies and grain beach microfacies are liable to develop various kinds of dissolution, the dolomite tidal flat microfacies is liable to develop fractures, and the reservoir space types are pore, cave and fracture systems. The types of karstification can be divided into syngenetic-quasi-syngenetic karst, supergene karst and buried karst. Since Wumishan Formation was deposited, it mainly developed in Qinyuian, Indosinian and Yanshanian supergene karst and buried karst in Late Himalayan, which played a constructive role in Wumishan Formation reservoir. The formation and evolution of karst thermal reservoir are decisively controlled by the dissolution in Yanshanian-Early Himalayan Stage. From Qinyuian to Himalayan Stage, three stages of high-angle fractures were mainly accompanied, which increased the reservoir space and transport system, and promoted the related dissolution after the period. And fractures are the most developed in dolomite, the second in calcareous dolomite, and the least developed in argillaceous dolomite. There are three high value zones in the area of porosity and permeability. The karst palaeogeomorphology was low in the north and high in the south before the Indosinian Stage, high in the north and low in the South after the Indosinian Stage, and strong karstification in the north, and karst belts were also developed in the southern sub-highlands. The dissolution facies is the most favorable diagenetic facies area, and the dissolution-argillaceous filling facies is the more favorable diagenetic facies area. The distribution of Wumishan Formation karst reservoirs in the study area is mainly controlled by lithology （including composition, structure, thickness）, diagenetic facies zone, structure （including faults, fractures, unconformities） and palaeogeomorphology. The most favorable targets for geothermal exploration are located in the west and south of Dawang Town, Rongcheng County-Bayu Township, Xiongxian County-Zhaobeikou Town, Daying Town and Gaoshen well 1-Gaoyang zones.
Dai Minggang Ma Pengpeng Lei Haifei Hu Jiaguo Guo Xinfeng Zhang Jiayun Bao Zhidong. Distribution characteristics and favorable targets of karst geothermal reservoir of Wumishan Formation in Xiong´an New Area[J]. Chinese Journal of Geology, 2020, 55(2): 487-505.