Sedimentary features,genesis and relation to hydrocarbon of fan-anticline in the North Slope of the Dongying Sag

The Dongying Sag is one of the most conspicuous petroleum generative depressions in East China. Much clastic deposit of glutenite accumulated and became an important place of hydrocarbon accumulation in the 3rd and 4th Members, Shahejie Formation in the North Slope of the Dongying Sag. Many fan-anticlines composed of sediments of the 3rd and 4th Member developed along the steep slope of the North Slope. Fan-anticline, as a sedimentogenic one, was different from general structural anticline. When glutenite accumulated and was covered by seal, the fan-anticlines were built up. Although the drape anticline is also a sedimentary one, it is different from fan-anticline in many respects. There are 3 genetic types of fan-anticline mainly, including, overriding of turbidite fan, near bank subaquatic fan and fan formed by differential compaction of glutenite. In the Well Fengshen 1, the drape trap was based on bossy basement, which lies in the middle part of the North Slope of the Dongying Sag. The drilling revealed t