雄安新区容城地热田碳酸盐岩热储采灌数值模拟  

Numerical Simulation of Exploitation and Reinjection of Carbonate Geothermal Reservoir in Rongcheng Geothermal Field,Xiongan New Area

作　　者：马峰[1,2] 高俊 王贵玲 刘桂宏[4] 余鸣潇[1,2] 赵志宏 刘金侠[5] Ma Feng;Gao Jun;Wang Guiling;Liu Guihong;Yu Mingxiao;Zhao Zhihong;Liu Jinxia(The Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences,Shijiazhuang 050061,China;Technology Innovation Center for Geothermal&Hot Dry Rock Exploration and Development,Minstry of Natural Resources,Shijiazhuang 050061,China;SinoProbe Center,Chinese Academy of Geological Sciences,Beijing 100037,China;Department of Civil Engineering,Tsinghua University,Beijing 100084,China;SINOPEC Star Petroleum Co.,Ltd.,Beijing 100083,China)

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]自然资源部地热与干热岩勘查开发技术创新中心,石家庄050061 [3]中国地质科学院地球深部探测中心,北京100037 [4]清华大学土木工程系,北京100084 [5]中国石化集团新星石油有限责任公司,北京100083

出　　处：《吉林大学学报（地球科学版）》2023年第5期1534-1548,共15页Journal of Jilin University：Earth Science Edition

基　　金：国家重点研发计划项目(2019YFB1504101);中国地质调查局项目(DD20189114)。

摘　　要：采灌均衡是水热型地热资源可持续开发利用的有效模式。为了模拟不同采灌情景下热储的温度与压力响应,为地热资源可持续开发提供理论支撑,本文采用数值模拟技术建立了雄安新区容城地热田蓟县系碳酸盐岩热储的数学模型。首先利用COMSOL软件对300 km^(2)区域内已有地热井的开采数据进行了数值模拟,模拟结果与监测数据吻合较好。然后在此基础上,对单井开采模式下蓟县系热储未来50 a内温度场和压力场变化趋势进行了预测;并针对热储水位下降趋势制定了回灌方案,分析了不同井间距对热储温度场和压力场的影响程度。结果表明:无回灌开采模式下,在40 a左右,水位埋深降低至150 m,每年水位下降约1.13 m;采用“一采一灌”方案的对井系统,在井间距分别为600、800和1000 m 3种情况下,增大井间距虽然减少了布置的对井数量,但是延长了热突破时间,增加了开采量,从而可以开采更多的热量。在实际工程中应通过数值模拟方法优化对井间距,保证开采量的增加同时延长热突破时间,以开采更多的热量。The balance of exploitation and reinjection is an effective model for the sustainable development and utilization of hydrothermal geothermal resources.In order to simulate the temperature and pressure response of geothermal reservoir under different exploitation and reinjection scenarios,and to provide theoretical support for the sustainable development of geothermal resources,a mathematical model of Jixian system carbonate geothermal reservoir in Rongcheng geothermal field in Xiongan New Area was established by using numerical simulation technology.Firstly,COMSOL software was used to simulate the exploitation history data of existing geothermal wells in 300 km^(2) area.The simulation results are in good agreement with the monitoring data.Then,on this basis,the variation trends of temperature and pressure field of Jixian geothermal reservoir in the future 50 years under the single well exploitation model were predicted.Finally,according to the the declining trend of water level,the reinjection scheme was established,and the influence degree of different well spacing on the temperature field and pressure field of geothermal reservoir was analyzed.The results show that in the non-reinjection mode,the buried depth of water level decreases to 150 m in about 40 a,and the water level decreases about 1.13 m/a.The geothermal doublet system of“one exploitation and one reinjection”scheme is adopted,and the well spacing is considered to be 600,800 and 1000 m respectively.Although increasing the well spacing reduces the number of arranged wells,it increases the exploitation amount and prolongs the thermal breakthrough time,so that more heat can be exploited.In practical engineering,the well spacing should be optimized by numerical simulation method to ensure the increase of production and prolong the thermal breakthrough time,so as to extract more heat.

关 键 词：数值模拟 COMSOL 回灌 容城地热田 碳酸盐岩 雄安新区 

分 类 号：P314[天文地球—固体地球物理学]