Fluid Inclusions Characteristics of Quartz Vein in Granite and Helium Accumulation in Guanzhong Basin, Shaanxi Province
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摘要: 关中盆地位于秦岭造山带和鄂尔多斯盆地的过渡带。基于钻井和地热井的资料，关中盆地具有富氦天然气和水溶氦气的资源，氦气主要来自于壳源气，富铀花岗岩是其主要的源岩。本文样品采自关中盆地南缘花岗岩中石英脉，通过显微激光拉曼光谱对石英裂隙的包裹体成分进行分析，测试结果显示为气液两相包裹体和H2O-NaCl-CO2包裹体，包裹体成分主要为H2O和CO2，还有少量的CH4、H2和H2S。按照类型划分为近原生包裹体，早期次生包裹体和晚期次生包裹体。包裹体均一温度测定结果，近原生包裹体的均一温度大于430℃，早期次生包裹体温度为330~370℃，晚期次生包裹体温度为170~230℃。据包裹体成分分析、包裹体均一温度测定，结合地区埋藏史，确定该区有2期成藏，其中晚期为主要成藏期，对应地质时期为中新世-上新世。Abstract: The Guanzhong basin is an important structural position, which is located in the middle zone between the Qinling Orogenic belt and the Ordos Basin. Based on the analysis of petroleum wells and geothermal wells, it can be inferred that rich-helium gas resource and water soluble helium gas resource were developed in the Guanzhong Basin. The helium gas is mainly sourced from the shell source gas, with uranium rich granite served as its main source rock. In this paper, the samples are collected from the quartz veins in the granite of the southern Guanzhong basin, and the fluid inclusion of cracks in quartz has been tested by using Ramnour-u1000 laser spectrometry. The study show that the majority of fluid inclusions are consisted of vapor-liquor (two phase) and CO2-bearing three phase inclusions. The vapor-liquor two phase fluid inclusions reveal the main components of H2O and CO2, with minor components of CH4, H2, and H2S. According to genetic difference, the fluid inclusions of the quartz vein can be divided into approximating primary inclusion, the early-secondary inclusion and the late-secondary inclusion. The results of micro-thermal analysis show that the homogenization temperature of approximation primary inclusion are more than 430℃,the ones of early-secondary inclusion vary from 330℃ to 370℃, and the ones of late-secondary inclusion range from 170℃ to 230℃. By integrating the fluid inclusions compositions, the homogenization temperatures, and combining with the thermal evolution of the Guanzhong Basin, it is believed that the fluid inclusions of quartz vein had formed as two charging orders. It is suggested that the critical is in the Miocene Epoch-Pliocene Epoch.
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Keywords:
- Guanzhong Basin /
- fluid inclusions /
- helium /
- accumulation characteristics
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