雄安新区容城地热田碳酸盐岩热储物性特征与产能分析OA

The investigation of geothermal energy is pivotal for urban development in the Xiong'an New Area.The study ex-amines the physical properties and productivity of deep Cambrian-Jixianian carbonates in the Rongcheng geothermal field,using logging,core,and drainage data from two boreholes(D19 and D21).The Jixianian Wumishan Formation(Jxw Fm.)ex-hibits broken layers relative to the overlying calcareous dolomite,with D19(2 900～4 000 m)and D21(2 200～3 100 m)inter-preted as having 20 and 8 layers,respectively,where the geothermal gradient approaches zero.The hydraulic conductivity(K)of Jxw Fm.is higher at 1.54 m/d in D19 than that of D21(0.26 m/d).D19's Jxw Fm.Production capacity surpasses that of the Changchengian Gaoyuzhuang Formation(Chg Fm.),with water contribution from the upper Jxw Fm exceeding 80%.Rough calculations show that the direct heating surface area of D19 measures 334 700 m2 and that of D21 is 41 900 m2.Re-gional pathways for water conduction facilitate convective heat transfer from the water,enabling spatial redistribution of heat.Therefore,we infer that the thermal reservoir near D19 exhibits elevated water temperature,substantial aquifer thickness,and favorable permeability,more conducive to geothermal development than those observed near D21.It is evident that the southern part of the Rongcheng geothermal field possesses greater development potential than the western part,primarily due to two factors:the east-west-trending Rongnan Fault and a longer period of karst exposure.