冀中坳陷雄县地热田主控因素及成因模式

雄县地热田基岩埋深浅，储层条件优异，是雄安新区地热开发利用的重点。通过野外观测、岩心、薄片、测井、录井等资料，对雄县地热田主控因素进行了系统的分析，并提出雄县地热田成因模式。研究表明，研究区热源主要为深部地壳热传导及放射热，盖层地温梯度平均为4.54 ℃/100m，蓟县系雾迷山组储层地温梯度平均为0.87 ℃/100m；水源主要为太行山及燕山山脉海拔500 m以上的现代大气降水及古大气降水，循环深度可达3 500 m；地下热水运移通道为保定—徐水断裂、容城断裂、牛东断裂及研究区内缝洞岩溶系统，判断在牛东断裂附近存在一条深部导水断层，地下热水沿断裂向上补充至凸起内部；储—盖组合为雾迷山组白云岩储层及其上覆的第三系、第四系砂泥岩地层，部分地区残存古近系地层，储层受溶蚀及裂缝改造作用明显，盖层保温效果良好，储盖配置条件优异。从“源、通、储、盖”四个角度综合探究雄县地热田主控因素，提出雄县地热田成因模式，为雄县地热田的后续再开发利用提供参考。

Genetic Model and Main Controlling Factors of the Xiongxian Geothermal Field

In the Xiongxian geothermal field， the Wumishan Formation is found buried at a shallow depth， and it has excellent reservoir conditions. This area is the focus of geothermal development and utilization in the Xiong'an New District. Through field observation in the early stages， combined with observation， thin section authentication， logging， and other data， the formation key factors of the Xiongxian geothermal area were systematically analyzed， and a genetic model for this area was proposed. The study found that the heat source in this area consists of mainly deep crustal conduction and radiant heat. The average geothermal gradient of the cap rock is 4.54 °C/m， and the average geothermal gradient of the Wumishan Formation is 0.87 °C/m. The water is sourced mainly from modern atmospheric and paleo-atmospheric precipitation in the Taihang and Yanshan Mountains at an altitude of over 500 m. The underground hot water circulates at a depth of 3 500 m and flows along the Baoding-Xushui fault， Rongcheng fault， Niudong fault， and fractured karst system in this area. We conclude that there may be a fault near the Niudong fault， as water can move to the inside of the uplift by this fault. The reservoir and cap rock combination is composed of the dolomite reservoirs of the Wumishan Formation and the Tertiary and Quaternary sand-shale formations， with Paleogene Stratum remaining in some areas. The reservoir is obviously affected by crack transformation， the cop rock has a good insulation effect， and the reservoir and cap rock combination is excellent. This paper comprehensively explores the formation key factors of the Xiongxian geothermal area from the four perspectives of “source， migration channel， reservoir， and cap rock” and proposes a genetic model for this area， which provides a reference for the development and utilization of the geothermal field in the Xiongxian area.