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以苏北盆地溱潼凹陷断阶带为研究对象,分析了Es1、Ed1和Ef1主要储层样品中的流体包裹体特征。根据储层有机包裹体分布特征、相态类型、与矿物的共生关系以及包裹体均一温度,结合埋藏史及热演化史,讨论了储层的油气充注历史。研究表明,溱潼凹陷断阶带油气主要为一期成藏,断阶带东段油气充注早于中段,总体表现在中新世中期以后油气开始大量充注。通过对储层包裹体和开放孔隙抽提物的研究,并依据生物标志物组合特征及地球化学参数对比,认为原油充注至今其油源没有发生变化,从侧面印证了溱潼凹陷断阶带油气主要为一期成藏的结论。
Taking the fault zone of Qintong sag in the northern Jiangsu basin as the research object, the characteristics of fluid inclusions in the main reservoir samples of Es1, Ed1 and Ef1 are analyzed. Based on the distribution characteristics of organic inclusions, the types of phases, the symbiosis with minerals and the homogenization temperature of the inclusions, the history of hydrocarbon filling in reservoirs is discussed based on the burial history and thermal history. The results show that the oil and gas in the fault zone of the Qintong sag is mainly of a stage of hydrocarbon accumulation. The eastern part of the fault zone was filled with oil and gas earlier than the middle part, and the oil and gas began to fill in a large amount after mid-Miocene. Based on the study of reservoir inclusions and open pore extracts and the comparison of biomarker assemblages and geochemical parameters, it is concluded that the oil source has not changed since the filling of crude oil, and the fault-grade zone of Qintong sag The main oil and gas accumulation for the conclusion of a period.