松辽盆地升平油田葡萄花油层水动力成藏机制研究

Hydrodynamic Accumulation Mechanism of Putaohua Reservoir in Shengping Oilfield of Songliao Basin

摘要: 升平油田位于松辽盆地东北部绥棱背斜带向中央坳陷区延伸的三肇凹陷升平鼻状构造上，葡萄花油层油水分布复杂、全油田无统一的油水界面。油层压力、原油物理性质、地层水组成等方面与常规静态油藏性质有一定区别。盆地周边活跃的大气水下渗向心流水体是否对油藏形成与分布有所影响，成为研究的重点。通过对油藏不同方向油藏剖面、平面上油水流体性质、油藏温度压力等分布特点的分析认为，升平油田葡萄花油藏的形成，是来源于油田西南方向三肇生油凹陷的油气沿升平鼻状构造上倾方向运移，受盆地东北部隆起区大气水下渗向心流的水动力遮挡，在升平鼻状构造形成的水动力圈闭。利用该认识，重新圈定了油田分布范围，确定了有利外扩潜力区。

Abstract: Shengping Oilfield was located in Shengping Nose Structure of Sanzhao Depression extending from Suiling Anticline Belt to the central depression in the northeast of Songliao Basin. Oil-water distribution in the Putaohua Reservoir was complex and there was no uniform interface between oil and water in the whole oilfield. The reservoir pressure, physical properties of crude oil, the composition of formation water and other aspects were different with those of conventional static reservoirs. The aim of this paper was to explore whether or not the infiltration of the inflow of ambient water into the perimeter of the basin affected the formation and distribution of the reservoir. Based on the analyses of the reservoir profiles in different directions, the fluid properties of oil-water in the plane and the temperature and pressure distribution of reservoirs, it indicates that the formation of Putaohua Reservoir in Shengping Oilfield is derived from the Sanzhao oil generating sag, oil and gas migrate upward along the updip-nose tectonic upwelling and obscured by the hydrodynamic blockage of the atmospheric infiltration in the northeast uplift of the basin in the upwelling and the hydrodynamic traps are formed by the uplifting nose structure. Based on the understanding, the distribution range of the oilfield is redefined and the favorable extension potential area is determined.