束鹿凹陷西部斜坡带馆陶组油气成藏模式

Hydrocarbon Accumulation Models of Guantao Formation in West Slope of Shulu Sag

束鹿凹陷位于冀中坳陷南部,钻录井资料表明,束鹿凹陷馆陶组底砾岩是一套形成于邻近高地附近的剥蚀或冲积产物,西部斜坡带馆陶组油藏具有双向油源,油气来自北部深县凹陷以及东部的束鹿北洼。馆陶组底砾岩油藏分布主要受构造背景和沉积相带控制,深部油气沿断层和不整合面向上运移,形成古生新储型油藏。储集层主要由馆陶组辫状河沉积砂体组成,与砾岩相伴生的砂岩可以构成良好的油气储层,形成岩性上倾尖灭、透镜体等多种类型的油气藏。馆陶组底部馆三段上部发育泥岩盖层,成藏和保存条件优越。

Sulu sag is located at the southern part of Jizhong depression. Well logging data shows that the basal conglomerate of Guantao formation in Sulu depression was generated by truncation or alluvial sediments, petroleum reservoir in western slope of Guantao formation is bi-directional oil source, hydrocarbon came from the north Shenxian sag and eastern Sulu sub-sag. Oil reservoir of the basal conglomerate in Guantao formation was controlled by structural background and sedimentary belts, the sandstone accompanying with conglomerate is good oil reservoir, the type of reservoir is mainly up dip lithology truncation and lens reservoir, shale developed at the upper part of section III in Guantao formation,making the seal condition good.