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.