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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。
The Enhanced Geothermal System (EGS) is a project that extracts heat from low-permeability, low-porosity formations. After the hydrothermal fluid is injected into deep geothermal reservoirs, water-rock interaction occurs in reservoir fractures, causing dissolution and precipitation of minerals in geothermal reservoirs and changing physical properties of fractured channels in reservoirs, which have a significant impact on the long-term operation of EGS. Taking a typical granite in the Sulz area as a man-made geothermal reservoir, a one-dimensional continuous multi-interaction geological model was established to inject CO2 and water at the same temperature into the fissure channel of artificial geothermal reservoirs at the same pressure. Influence of Water - rock Interaction of Specified Heat - carrying Fluid on Physical Characteristic of Fracture in Reservoir. The results show that the CO2-EGS water-rock interaction has less influence on the physical property of the fissure channel than that of H2O-EGS in the same reservoir state and same operating mode.