关键词: 输导脊, 形成机制, 蓬莱9-A油田, 不整合面, 骨架砂体, 浅层油藏

Abstract: According to the comparison and analysis of 3D seismic, drilling, well logging, thin section and inclusion data and skeletal sand body transport ridges, a study was carried out on the main controlling factors for the formation of the transport ridges on the unconformity in the buried hill in Penglai 9-A Oilfield. The result shows that the formation of the ridges is mainly related to the physical properties and lithology of the buried hills, the transport ridges and the structural ridges do not necessarily overlap, and the development of the fractures in the semi-weathered rocks is the key to the lateral transport system; the transport ridges are controlled by structural height difference and buoyancy, and they are superimposed with the structural ones; the sand ridges along the unconformity can be used as transfer stations of shallow hydrocarbon accumulations, and the effective combination of trap area on the sand ridge, faults and ridges controls the abundance of the shallow accumulations; if the trap area is larger, and the faults cut into the high of the trap, the abundance of the reservoir in shallow traps is high, and this has been confirmed by drilling data. In addition, it is found that the ridges are important to control hydrocarbon accumulation in the slope and bulge zones uncovered by source rocks.

Key words: transport ridge, formation mechanism, Penglai 9-A oilfield, unconformity, skeleton sand body, shallow reservoir