惠民凹陷西部沙四段油气成藏条件分析

从构造及沉积背景出发，分析了惠民凹陷西部沙四段油气的成藏条件。结果表明，沙四段的油源条件、储层特征、盖层条件、运移条件及圈闭都有利于成藏。洼陷边缘的阶状断层充当了良好的油源断层，形成了侧向运聚成藏模式和阶梯状运聚成藏模式。侧向运聚成藏模式的特点是油气沿砂层进入各种孔道，向夏口断裂带侧向运移、聚集成藏；阶梯状运聚成藏模式的特点是油气沿临邑大断层向中央隆起带做侧向和垂向运移、聚集成藏。

Conditions of petroleum pools formation of the fourth member of Shahejie Formation in the west Huimin Depression

According to tectonic and sedimentary characteristics,the petroleum reservoir forming conditions of the fourth member of Shahe-jie Formation in the west Huimin Depression are discussed.The results show that conditions of oil source,reservoir characteristics,cap-rock,migration and entrapment were advantaged conditions for oil and gas reservoir formation.A series of stepped faults along depression margins act as oil-source faults.There were two hydrocarbon accumulation patterns;the lateral transporting pattern with hydrocarbon enter pore passage along the sandstone and then migrated laterally to Xiakou faulted zone and accumulate,and the stepped transporting pattern with hydrocarbon migrate laterally and vertically to the central uplift belt along the Linyi fault and accumulate.