增强型地热系统热储层研究进展  

Advances in Research on Reservoirs of Enhanced Geothermal System

作　　者：林鹏威 曾平[1] 林署炯 张澄博[1] 

机构地区：[1]中山大学地球科学与地质工程学院,广东广州510275

出　　处：《中外能源》2015年第10期21-30,共10页Sino-Global Energy

基　　金：广东省自然科学基金面上项目"真空预压条件下珠三角肥水区淤泥质土电动加固机理研究"(编号:S2013010012521);广东省自然科学基金重点项目"珠江三角洲第四纪断裂活动及其环境效应"(编号:10251027501000019)的资助

摘　　要：热储层是增强型地热系统(EGS)中的关键一环,热储层激发效果的好坏直接影响到流体采热效果,选择适当的激发方法以及对激发效果进行实时评价是十分重要的。目前在热储层激发中最常用的方法是水力压裂法,化学激发法是次要方法 ,而热激发法则通常是辅助方法。从场地试验结果看,要想获得较好的激发效果,可以采取多次激发或多方法联合使用。利用微震监测、现场示踪试验和数值模拟等方法,可以分析热储层裂隙压裂情况、连通情况以及获得有关的热储层参数,进而对热储层激发效果进行评价,有助于EGS的设计和运行管理。EGS开发过程中热能开采率受到许多因素的影响,通过数值模拟手段能够分析影响EGS热能开发的内在因素(指热储层的各项参数,如热储层初始温度、渗透率、裂隙情况等)和外在因素(如井间距离、布井方式、注入流体温度、注入流体类型、井深等),了解每个因素的影响程度,这对于EGS的设计和开发是非常重要的。同时,通过数值模拟手段研究热储中THMC(温度场、渗流场、力学场、化学场)四场耦合作用,对于EGS的商业运行也是至关重要的。Geothermal reservoir is a key component of an enhanced geothermal system（EGS）.As geothermal reservoir stimulation has a direct effect on the recovery of heat from fluids,it is very important to select an appropriate stimulation method and to assess the effect of stimulation in real time.Hydraulic fracturing is cur-renlty the most commonly used method for geothermal reservoir stimulation,followed by the chemical stimulation metod.Thermal stimulation is usually used as an auxiliary method.From field experiment results,in order to achieve good stimulation results,multiple stimulations or combined methods can be used.Some methods,such as micro-seismic monitoring,field tracer migration tests and numerical modeling,can be used to analyze the status of geothermal reservoir fracturing,connectivity and relevant parameters,enabling assessment of the effectiveness of stimulaiton of geothermal reservoirs and contibuting to EGS designs and operational manage-ment.A range of factors affect the recovery of heat during EGS development.Numerical modeling can be used to analyze the intrinsic factors（parameters of geothermal reservoirs,such as the initial temperature,permeability and fractures of a geothermal reservoir） and extrinsic factors（inter-well distance,hole patterns,temperatures and types of injected fluids and hole depths） affecting EGS thermal development and to understand the effect of each factor.This is very important to the design and development of EGS.In addition,it is also crucial to the commercialization of EGS to study the coupling effect of THMC in geothermal reservoirs through numeri-cal modeling.

关 键 词：增强型地热系统 热储层 储层激发 数值模拟 四场耦合作用 

分 类 号：P314[天文地球—固体地球物理学]