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《Journal of Chengdu University of Technology(Science & Technology Edition)》 2018-03
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Fluid characteristics and evolution of Longtan Formation tight sandstone cements in Huangqiao area,Lower Yangtze,China

DU Ting;XING Fengcun;LU Yongchao;HU Huarui;CHEN Ping;State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Chengdu University of Technology;College of Resources,China University of Geosciences;  
The environment and evolution process of fluid in quartz overgrowth coexists with siderite cement in tight sandstone of the Upper Permain Longtan Formation in Huangqiao area,Lower Yangtze region,are studied on the basis of analyses of homogenization temperature,salinity and fluorescence of fluid inclusions,microscopy of scanning electron and X-ray diffraction.It reveals that the quartz overgrowth is formed obviously earlier than siderite cements,the transition from acidic fluid to alkaline fluid between quartz overgrowth and siderite cement occurs under similar temperature and salinity and the quartz overgrowth is related to early carbon-rich acid fluid environment.The conversion process from acid fluid environment to alkaline fluid environment may be related to theactivity of anaerobic bacteria under the condition of shallow buried anaerobic environment in carbonaceous laminates.The formation of two types of cements with the record of high salinity in the same samples generally experienced the influence of hot fluid activity related to the thermal event of Dongwu Movement,with the record of high salinity.However,the formation process of two types of cements is not involved in the activity of hydrocarbons.Fluid medium transits from alkaline to acidic environment in tight sandstone by organic maturity and hydrocarbon filling after the formation of siderite.
【Fund】: 成都理工大学中青年骨干教师培养计划项目
【CateGory Index】: P618.13
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