Characteristics and Evaluation of Geothermal Resources in the Rongdong Area of Xiongan New Area
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摘要: 雄安新区容东片区是新区规划建设的第一个安置区, 具有较好的地热资源赋存潜力。查明该地区地热地质条件, 准确评估其地热资源量, 可为雄安新区地热资源的开发利用、能源结构转型提供理论支撑。本文综合分析深部地质结构、断裂分布、地温场与水化学场等, 揭示了容东片区地热资源赋存特征和形成机理, 采用采灌均衡法综合评价了蓟县系碳酸盐岩热储地热资源量。主要结论: (1)本区的主要热储层包括新近系明化镇组孔隙型砂岩热储、蓟县系雾迷山组及高于庄组碳酸盐岩热储、长城系碳酸盐岩热储; 其中, 蓟县系热储为地热勘查开发主要目标层段, 其水温约为 50 ℃, 储厚比为 20%～40%, 储层最大孔隙度为11.3%。(2)西北部太行山地区大气降水是本区地热资源的补给水源, 地下水沿断裂经深循环被深部热源加热, 而后沿导水断裂带运移至凸起处强岩溶裂隙发育区, 形成水热型地热系统。(3)容东片区蓟县系碳酸盐岩热储在采灌均衡条件下热储地热流体可开采量为1.33×104 m3/a, 地热流体可开采热量为0.95×1015 J/a, 折合标准煤3.23万吨/年。以上研究助力构建雄安新区清洁低碳、安全高效的能源体系。Abstract: The Rongdong area is the first resettlement in the planning and construction of Xiongan New Area, which offers good potential for geothermal resources. The identification of its geological conditions and the accurate assessment of its geothermal resources can provide theoretical support for the development and utilization of geothermal resources and the transformation of the energy structure in Xiongan New Area.This study determined the geothermal resource characteristics and formation mechanism of the Rongdong area through analysis of the geological structures, fault distributions, heat flow, and hydrochemical field characteristics. The geothermal resources of the Jixian system carbonate thermal reserve were then evaluated using the equilibrium method of extraction-reinjection. The results showed: (1) The main geothermal reservoirs in the study area include the porosity-type geothermal reservoir of the Neoproterozoic Minghuazhen Formation, the carbonate thermal reservoir of the Jixian System Wuzhishan Formation and Gaoyuzhuang Formation, and the carbonate thermal reservoir of the Changcheng System. The thermal reservoir of the Jixian System is the primary thermal reservoir for geothermal exploration and development, with a water temperature of approximately 50 °C, a reservoir thickness ratio of 20%-40%, and a maximum reservoir porosity of 11.3%. (2) Atmospheric precipitation in the northwestern Taihang Mountains is the recharge source of geothermal resources, groundwater is heated by deep rock along the fractures through deep heat provider, and then transported along the hydraulic fracture zone to the strong karst fissure development area at the bulge, forming a hydro-geothermal systems.(3) The recoverable resources of the geothermal fluids in the carbonate thermal reservoirs of the Jixian system under the balanced extraction and reinjection conditions are 1.33×104 m3/a, and the recoverable heat of geothermal fluid is 0.95×1015 J/a, which is equivalent to 32 300 tons of standard coal pear year. This research will help build a clean, low-carbon, safe and efficient energy system for the Xiongan New Area.
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