三塘湖盆地马朗凹陷二叠系油气运移机制与页岩油富集规律

doi:10.11743/ogg20130602

Abstract

Abstract: The shale oil potential is high in the Permian Lucaogou Formation in Malang Sag,Santanghu Basin.Its genetic mechanism and accumulation patterns are greatly different from those of conventional reservoirs.Migration is a major component of genetic mechanism of shale oil.Based on core and thin section observation,and in combination with geochemical data and geological condition analysis,this paper studied the migration mechanism of shale oil,including dynamic force,pathway,direction,distance,efficiency and so on.Migration effect of shale oil within source rocks is insignificant,thus shale oil reservoirs are not the result of oil migration and accumulation within source rocks.In contrast,vertical migration effect of shale oil out of source rocks is significant.The existence of large active faults may lower the abundance of shale oil in source rock.High formation pressure caused by hydrocarbon generation is the main dynamic force of primary migration.After small scale migration through kerogen network,interlamination and microfractures,most of the oil generated retain in place,and the migration efficiency is very low.On the contrary,in areas where carrier faults are well developed,the oil can migrate vertically along the faults and accumulate in the overlying reservoirs of the Lucaogou Formation.This migration mechanism of shale oil determines the characteristics of shale oil play such as continuous distribution,no obvious oil-water contact,no influence of structure on oil accumulation,and low abundance of oil in areas with active faults.

Key words: migration effect, migration pathway, shale oil, Permian, Malang Sag, Santanghu Basin

CLC Number:

TE122.1

Liu Bo, Chi Yaao, Huang Zhilong, Luo Quansheng, Wu Hongzhu, Chen Xuan, Shen Ying. Migration mechanism of the Permian hydrocarbon and shale oil accumulation in Malang Sag, the Santanghu Basin[J]. Oil & Gas Geology, 2013, 34(6): 725-730.

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Migration mechanism of the Permian hydrocarbon and shale oil accumulation in Malang Sag, the Santanghu Basin

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