民丰洼陷岩性油气藏控制因素分析

本文对民丰洼陷的油气成藏特点、油气富集规律及主控因素进行了研究。研究结果表明,该区处在凹陷东北边缘的特殊位置,成藏条件优越。古近系岩性油藏主要包括砂岩透镜体油藏、砂体上倾尖灭油藏和砂体被断层切穿的岩性油藏三种类型。三角洲前缘砂体、滑塌浊积岩砂体的性质和分布,砂体分布范围内有利的构造位置和有利的沉积储集相带成为控制岩性油藏形成的主要因素。油气勘探方向应围绕不同时期、不同部位两种成因的储集砂体展开。

Analysis on the Control Factors of Lithologic Reservoirs in Minfeng Depresison

The characteristics of reservoir formation, hydrocarbon enrich rules and its major control factors in Minfeng Depression are studied. The result shows that the area, which is located in the northeast margin of the depression, has advanced conditions of reservoir formation. Paleogene lithologic reservoir is composed of lens reservoir, updip wedge-out reservoir and lithologic reservoirs with sandbody cut by faults. The major factors controlling the formation of lithologic reservoirs are delta front sandbody, the property and distribution of slumping turbidite, the beneficial structural position and sedimentary reservoir facies in the sandbody.