地热流体异层采灌混合作用水化学数值模拟  

Hydrochemical numerical simulation of the mixing of exploitation and reinjection fluid at different geothermal reservoir

作　　者：李俊峰[1] 刘东林[1] 曾梅香[1] 田光辉[1] 

机构地区：[1]天津地热勘查开发设计院,天津300250

出　　处：《工程勘察》2013年第8期39-43,共5页Geotechnical Investigation & Surveying

基　　金：天津市国土资源和房屋管理局矿产资源补偿费项目

摘　　要：天津市是全国少有的几个能够做到地热流体回灌的城市,截止到2011年底地热流体回灌量为908.64×104m3。随着地热资源开发力度加大,异层采灌系统近年来也不断增加。回灌过程中不同水质的地热流体发生的地球化学作用是很复杂的,没有地球化学作用过程的模拟,很难了解并预测异层采灌对回灌井热储层水质的影响。本文以一对异层采灌模式的对井为例,采用PHREEQC软件模拟不同比例异层流体混合后随时间推移的变化规律,为合理开发和保护地热资源提供依据。Tianjin is one of the few cities in china which could perform the geothermal reinjection, by the end of 2011, the volume of geothermal reinjection is 908.64 × 104m3. With the strengthen of geothermal resource development, exploitation and reinjection system of different layers has been increased in recent years. The geochemical reaction of different quality geothermal fluids in the reinjection process is very complicated. It is difficult to realise and forecast the impact of the reinjection to the water quality of injection well aquifer without geochemical numerical simulation. This paper takes two wells of different layers as example, using PHREEQC software to simulate the process of different mixing ratio of water from different layers, and provides a basis for rational development and protection of geothermal resources.

关 键 词：地热流体 异层采灌 混合比例 PHREEQC 

分 类 号：TU461[建筑科学—结构工程]