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通过对东营凹陷沙三中亚段砂岩储层中376块流体包裹体样品的系统分析,将研究区的油气充注划分为3个期次,并确定出3期油气充注发生的时间。运用流体包裹体PVT热动力学模拟的方法,获得了3个充注期的古压力演化,结合本区平面和剖面上现今地层压力的分布,确定了沙三中亚段油气藏可视为处于同一个含油气压力系统中。在此基础上,利用流体包裹体所获得的参数恢复了沙三中亚段3期古油水势场的演化,并分析了其分布特征,探讨了油气充注期中的有利油气聚集区。认为东营凹陷油气藏的分布与古流体势的演化有密切的联系,3期油气充注时期古油势控制成藏的阀值分别为7,10.5和22 kJ/kg,利津洼陷北坡和牛庄洼陷南坡是第一期有利的油气低势聚集带,围绕牛庄洼陷和利津洼陷这两大高油势中心的周边区域为第二期有利油气成藏带,第三期油气有利成藏带逐渐扩展到民丰和博兴两大洼陷周缘区域。
Based on the systematic analysis of 376 fluid inclusions in sandstone reservoirs of the Middle Third Member of Shahejie Formation in Dongying Depression, the hydrocarbon filling in the study area is divided into three periods, and the period of occurrence of oil and gas filling in Phase 3 is determined. Based on the PVT thermodynamic simulation of fluid inclusions, the paleo-pressure evolution of three filling periods was obtained. Based on the distribution of present formation pressure in the plane and section of this area, In the same oil and gas pressure system. Based on this, the evolution of the paleo-oil potential field in the 3rd Member of the Middle Third Member of the Third Member of the Third Member of the Third Member of the Shahejie Formation is restored by using the parameters obtained from the fluid inclusions. The distribution features of the oil-water potential are analyzed, and the favorable hydrocarbon accumulation areas during the filling of oil and gas are discussed. It is concluded that the distribution of reservoirs in Dongying sag is closely related to the evolution of paleo-fluid potential. The thresholds for the control of paleo-oil accumulation during the period of oil-gas filling in Phase 3 are 7, 10.5 and 22 kJ / kg, respectively. The south slope of Zhuang Sag is the first favorable hydrocarbon accumulation zone. The surrounding area around the two high oil potential centers, Niuzhuang Sag and Lijin Sag, is the second favorable hydrocarbon accumulation zone. The third oil and gas reservoir The favorable Tibetan belt gradually expanded to the periphery of the two major depressions, Minfeng and Boxing.