雄安新区容城凸起区地热可采资源量动态预测  

Dynamic prediction of geothermal recoverable resources in the Rongcheng uplift area of the Xiong’an New Area

作　　者：胡秋韵 高俊[3] 马峰[1,4] 赵志宏[5] 刘桂宏 王贵玲[1,3] 张薇[1] 朱喜[1] 张保建[3] 邢一飞[3] HU Qiuyun;GAO Jun;MA Feng;ZHAO Zhihong;LIU Guihong;WANG Guiling;ZHANG Wei;ZHU Xi;ZHANG Baojian;XING Yifei(Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences,Shijiazhuang,050061;China Geological Survey,Beijing,100037;Deep Exploration Center,Chinese Academy of Geological Sciences,Beijing,100037;China University of Geosciences(Beijing),Beijing,100083;Tsinghua University,Department of Civil Engineering,Beijing,100084)

机构地区：[1]中国地质科学院水文地质环境地质研究所,石家庄050061 [2]中国地质调查局,北京100037 [3]中国地质科学院深部探测中心,北京100037 [4]中国地质大学(北京),北京100083 [5]清华大学土木工程系,北京100084

出　　处：《地质学报》2020年第7期2013-2025,共13页Acta Geologica Sinica

基　　金：国家重点研发计划项目(编号2018YFC0604306);中国地质调查局项目(编号DD20189114);中国地质科学院基本科研业务费(编号JYYWF201811);国家自然科学基金青年基金项目(编号41502249)联合资助的成果。

摘　　要：雄安新区地热资源丰富,其中容城凸起区是雄安新区地热资源赋存条件最好的地区之一。通过分析容城凸起区地质构造背景、地热形成机理,建立了容城凸起区热储的地质模型和数学模型。基于COMSOL Multiphysics软件,对区域内主要热储层的地热资源开采进行了数值模拟,计算结果与监测数据拟合较好。在此基础上,通过在各开采区内合理布置开采和回灌井,评价容城东部地区采灌均衡条件下的地热资源量。本研究模拟了不同采灌量(100 m3/h、150 m3/h和200 m3/h)对可采地热资源量的影响,结果表明:当开采量为100 m3/h满足评价标准:①10年地下水位下降小于5 m;②单井地下水位不低于150 m;③开采井100年水温下降<2℃时,年可开采热量8.53×1014J/a,可供暖面积240.9万m2。模型中开采井、回灌井分区布置,不仅可以避免热突破,且在对于渗透性良好的储层地热尾水可快速补给至开采区,能有效维持热储压力。本文初步摸清了雄安新区容城东部片区可开采地热资源量,为今后整个雄安新区地热资源合理开发利用提供了重要的依据。The Xiong’an New Area is rich in geothermal resources such as the shallow geothermal energy and the middle-deep geothermal energy.Most high quality geothermal resources are concentrated in the Xiong’an Rongcheng uplift area.Based on the analysis of the geological tectonic setting and geothermal formation mechanism of the Rongcheng uplift area,the geological model and mathematical model of the heat storage in the Rongcheng eastern resettlement area are established.Based on COMSOL Multiphysics software,numerical simulation of geothermal resource exploitation of the thermal reservoirs in the area was carried out.The calculated results are in good agreement with the monitoring data.On this basis,the annual recoverable heat and the required heating demand in the Rongdong resettlement area are evaluated by judiciously arranging the mining and recharge wells in each mining area.Simulating the effects of different irrigation yields(100 m3/h,150 m3/h and 200 m3/h)on the amount of geothermal resources available,the results show that when the extraction volume is 100 m3/h,the following evaluation criteria are met:①the drop in groundwater is less than 5 m after 10 years of groundwater extraction;②the single well groundwater level is not below 150 m;③the 100-year water temperature drop of the production well is less than 2℃.The annual recoverable heat is 8.53×1014 J/a,and the heating area is 2.409 million m2.The divisional arrangement of the production wells and recharge wells in the model can not only avoid thermal breakthrough,but can also quickly replenish the geothermal tail water to the mining area for high-permeability reservoirs,thus effectively maintaining the heat storage pressure.This paper initially documents the amount of geothermal resources that can be mined in the Xiong’an Rongdong resettlement area,and provides an important basis for the future rational development and utilization of geothermal resources in the Xiong’an New Area.

关 键 词：数值模型 可采地热资源量 供暖需求面积 容东凸起区 

分 类 号：P314[天文地球—固体地球物理学]