摘要:本文综合分析了雄安新区起步区及周边地区构造、沉积、地温梯度、储盖组合、热储成岩与孔隙演化史等地质特征，总结了研究区地热资源成藏模式与影响因素：中-上元古界碳酸盐岩热储沉积期物质基础的差异性、后期的燕山—喜山构造运动演化特征控制了研究区热储、盖层和通道组合特征；特别是研究区断裂构造作用是决定研究区碳酸盐岩地层抬升、剥蚀并使其遭受岩溶作用的主导因素，其控制了本区岩溶发育区的分布和岩溶古地貌的总体格局；中-上元古界碳酸盐岩岩相以发育藻礁滩和藻坪为特征；岩溶作用类型主要有准同生岩溶、层间岩溶、潜山岩溶和断层相关岩溶等，其横向分布受古剥蚀地貌高地的控制，纵向上受潜水面的控制具有分带性特征；对热储起建设性的成岩作用主要有溶蚀作用、构造破裂作用等；本区雾迷山组热储井口水温多在50 ℃～60 ℃、热水出水量多在80～120 m3/h、矿化度多在1 900～3 100 mg/L之间。主要来自太行山麓的大气降水经断裂及不整合运移至研究区凸起、古潜山等正向构造单元的中-上元古界碳酸盐岩地层有利沉积相带处，在运移和储集过程中经正常热流背景下的深部来源的热持续加热，在凸起、古潜山等正向构造单元处特别是断裂发育带聚集成藏，形成具有勘探开发价值的地热田。
关键词: 地热/
雄安新区/
影响因素/
成藏模式/
岩溶热储/
容城凸起/
冀中坳陷
Abstract:The geological characteristics of the structure, deposition, geothermal gradient, reservoir-cap assemblage, diagenesis-porosity evolution history in the starting and adjacent zone of Xiong'an new area are synthetically analyzed, and the accumulation pattern and influence factors of geothermal resources in the study area are summarized. The difference of material base in the Middle and Upper Proterozoic carbonate rocks during the geothermal reservoir sedimentary period and the evolution characteristics of the later Yanshan-Himalayan tectonic movement control the characteristics of the geothermal reservoir; cover layer and channel combination in the study area, especially the faults structure of the study area is the controlling factor of the uplift, erosion and karstification of the carbonate strata, and it controls the distribution of karst development zone and the overall situation of karst palaeogeomorphology in the study area. The Middle and Upper Proterozoic carbonate rock facies are characterized by the development of algal reef shoal and algal flat, and the main types of karstification are quasi syngenetic, interlayer buried-hill and fault related karst, whose transverse distribution is controlled by the highland of the ancient denudation geomorphology, and which has the zoning characteristics in the longitudinal direction and is controlled by the submerged surface. The main constructive diagenesis for the geothermal reservoir is dissolution and structural fracturing. The wellhead water temperature of Wumishan Formation is mostly 50 ℃～60 ℃; the hot water discharge is mostly 80～140 m3/h; and the salinity is mostly between 1 900～3 100 mg/L. The atmospheric precipitation, mainly from the foot of the Taihang Mountain, is transported to the favorable sedimentary facies zone through fracture and unconformity of the Middle and Upper Proterozoic carbonate strata in the protruding structural units, such as the uplifts and the buried hills, and heated by the earth deep heat flow under the normal heat flow background during the migration and reservoir process. Finally, the geothermal water accumulates and forms a geothermal field with exploration and development value at the positive structural units, such as the uplifts and the buried hills. And the fault zone of positive structural unit usually develops the most target reservoir in the geothermal field.
Key words:Geothermal/
Xiong'an new area/
Influence factors/
Accumulation pattern/
Karst reservoir/
Rongcheng uplift/
Jizhong depression area
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