南堡凹陷高柳地区深层岩性油藏成藏条件研究

南堡凹陷高柳地区油气资源丰富,具有良好的构造背景,沙河街组三角洲前缘砂体发育,储层物性主要为中孔-中低渗储层,沙三亚段顶部发育稳定的厚层泥岩段,北东走向断层是油气垂向运移的主要通道,油气运移方式以阶梯状运移方式和"T"形或网状运移方式为主,具有形成下生上储三角洲前缘砂岩岩性油藏的的物质基础。古近系东营组地层沉积末期,该区构造运动减弱,断层不发育,具有良好的保存条件。区内发育4种典型的砂岩岩性油藏成藏模式,分别是砂体上倾尖灭油藏、透镜体油藏、不整合遮挡油藏和断层-岩性油藏。研究认为沙河街组分流河道砂岩油藏的形成与分布主要受烃源、构造和岩性三重因素控制。

Research on condition of deep lithologic reservoir accumulation in Gaoliu area of Nanpu sag

There are rich oil- gas resources in Gaoliu area of Nanpu sag with the favourable structural setting.The delta front sandbodies in Shahejie formation are developing,the reservoir physical properties are mainly medium- low permeable reservoir,the thick mudstone is developed in Es32 upper position,NE- strike faults are the main channels of oil- gas vertical migration.Oil- gas migration is mainly as ladder-shape,T- shape and mesh- like models with the fine condition of lower- generation and upper- storage in lithologic reservoir of delta front.At the end of Paleogene Ed formation sedimentation,tectonic movement becomes weakened and the faults are less in the area and so it has the good preservation condition.There are four type of typical lithologic sandstone hydrocarbon accumulation models developed in the area involving updip pinchout sandstone reservoir,lenticular reservoir and unconformable screened reservoir,as well as fault- lithology trap.It is considered that the formation and distribution of the sandstone reservoir in Shahejie formation distributary channel are mainly controlled by oil- gas resources,structure and lithology.