Abstract: Shuanghe Oilfield is a famous "small and abundant" large continental oilfield with over a hundred million tons of oil reserves,and it is also a typical sandstone updip wedge-out reservoir.The mechanism of oil and gas accumulation in Shuanghe Oilfield was studied systematically by analyzing the forming process of sandstone updip wedge out traps,migration style of oil and gas,the process of hydrocarbon accumulation in a large scale caused by different uplifting tectonic movements in the late Liaozhuang period.The results show that the tectonic basculation movement resulted in the formation of sandstone updip wedge out trap,and different uplifting tectonic movement resulted in increase of closure extent of sandstone updip wedge out trap to a large extent in the late Oligocene.The migration pathway of oil and gas is in the sandstone transporting layers,and hydrocarbon charged in an unit of oil measures and migrated laterally along the stratum.The main hydrocarbon accumulation of Shuanghe Oilfield happened in the late Oligocene of late Liaozhuang period.The model of hydrocarbon accumulation is that oil and gas charged in a small scale in the early stage,and those charged in a large scale in the middle and late stage to form reservoir continuatively.

Key words: sandstone, updip wedge out trap, oil and gas migration model, differential uplifting tectonic movement, hydrocarbon accumulation mechanism, Shuanghe Oilfield

摘要： 双河油田是我国著名的"小而肥"陆相亿吨级大油田,同时发育典型的砂岩上倾尖灭油气藏.详细分析了双河油田砂岩上倾尖灭圈闭的形成过程、油气运移方式、差异抬升导致油气大规模充注成藏过程,对其成藏机理进行了系统研究.研究发现,迁移性构造翘倾导致砂岩上倾尖灭圈闭的形成,廖庄期末,差异抬升导致砂岩上倾尖灭圈闭的闭合幅度大幅增加.油气以砂岩输导层为运移通道,以油组为充注单元,侧向顺层运移.晚渐新世廖庄期末为双河油田的主要成藏期,其成藏模式是:早期为小规模油气充注,中晚期为大规模油气充注叠加连续成藏.

关键词: 砂岩, 上倾尖灭圈闭, 油气运移方式, 差异构造抬升, 油气成藏机理, 双河油田