基于TOUGH2数值模拟软件的延津地区热储采灌研究

本文采用TOUGH2数值模拟软件,根据研究区对井在预设情景下运转30年的模拟结果,对河南省延津县下新近系热储层压力场、温度场进行模拟,在模型验证的基础上,对不同回灌率及不同采灌井间距工况进行模拟研究,结果显示:回灌井的回灌过程会使地下水水温降低,回灌时间越长水温降低幅度越大,影响范围也越大,根据模拟抽水井和回灌井不同间距条件下(55 m、150 m、250 m、300 m)温度场变化情况,建议区域下新近系地层地热回灌项目抽水井和回灌井间距应大于等于250m,以保证抽水井出水温度;而不同回灌率工况下分析化学场和压力场的模拟数据可以看出,回灌率越大,地热水水质、压力影响越大,基本呈线性关系。为区域地热资源回灌-开采提供示范和指导。

Research on Thermal Storage and Irrigation in Yanjin Area Based on TOUGH2 Numerical Simulation Software

In this paper,using the TOUGH2 numerical simulation software,based on the simulation results of the wells operating in the preset scenario for 30 years,the pressure field and temperature field of the Lower Neogene thermal reservoir in Yanjin County,Henan Province are simulated,based on the model verification.The simulation study of different recharge rates and different irrigation and well spacing conditions shows that the recharge process of the recharge well will reduce the groundwater temperature.The longer the recharge time,the greater the decrease of water temperature and the greater the impact range.According to the variation of temperature field under the different spacing conditions of simulated pumping wells and recharge wells(55 m,150 m,250 m,300 m),it is suggested that the spacing between pumping wells and recharge wells in the Neogene stratum geothermal recharge project under the area should be greater than or equal to 250 m.The water output temperature of the pumping well is guaranteed;and the simulation data of the analytical chemical field and the pressure field under different recharge rate conditions can be seen that the greater the recharge rate,the greater the influence of geothermal water quality and pressure,and the linear relationship is basically.Provide demonstration and guidance for regional geothermal resource recharge-mining.