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以咸阳城区蓝田灞河组孔隙型热储流体为研究对象,应用环境同位素法、离子比分析法对其同位素分布规律、富集趋势以及水化学类型进行分析,确定其同位素水文地球化学特征,并对其成因类型进行论证。研究中发现受控于沿渭河东西向深大断裂的南北热储流体,其水化学特征各异而同位素差异不大,北部水化学类型单一,全部为Na-Cl型水,南部Na+,HCO3-和SO42-含量较高,水化学类型复杂,体现出研究区地下热储环境形成过程的复杂性。同位素结果显示咸阳热储流体完全不同于浅层循环地下热水,可能为赋存混入古溶滤水的残存沉积水,亦或为混入残存沉积水的古溶滤水。
Taking the Lanjianhuhe Formation pore-type thermal reservoir fluid in Xianyang city as the research object, the isotope hydrographic and geochemical characteristics of the isotopes were analyzed by using isotope analysis and ion ratio analysis. Demonstrate its cause type. The study found that the north-south heat reservoir fluids controlled by the east-west deep-fault faults along the Weihe River have different water chemistry features with little difference in isotopes. The northern water chemistry type is single and all are Na-Cl type water. The Na +, HCO3- And SO42- are high, and the types of water chemistry are complex, which reflects the complexity of formation process of underground thermal storage environment in the study area. The isotopic results show that the Xianyang thermal storage fluid is completely different from the shallowly circulating groundwater, which may be residual sedimentary water mixed with pale-leaching water or paleosold water mixed with residual sedimentary water.