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科技导报  2014 

EGS载热流体水岩作用对人工地热储层裂隙物性特征的影响

DOI: 10.3981/j.issn.1000-7857.2014.14.006, PP. 42-47

Keywords: 增强型地热系统,地热储层,水岩作用,载热流体,物性特征

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Abstract:

增强型地热系统(EGS)是一种从低渗透率低孔隙度岩层中提取热量的工程。载热流体注入深部地热储层后在储层裂隙发生水岩作用,引起地热储层矿物的溶解和沉淀,改变储层裂隙通道的物性特征,对EGS的长期运行产生重要影响。以苏尔茨地区的一种典型花岗岩为人工地热储层,建立了一维多重相互作用连续统一体地质模型,将相同温度的CO2和水以相同压力注入人工地热储层裂隙通道中,探讨两种载热流体的水岩作用对储层裂隙物性特征的影响。结果表明,在同样的储层状态、相同的运行模式下,CO2-EGS水岩作用对裂隙通道物性特征的影响明显小于H2O-EGS。

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