Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (1): 14-20.doi: 10.3969/j.issn.1673-8926.2015.01.002

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Oil-gas accumulation models and their main controlling factors in Wuerxun-Beier Depression

FU Guang， WU Wei   

  1. College of Earth Sciences ， Northeast Petroleum University ， Daqing 163318 ， Heilongjiang ， China
  • Online:2015-02-03 Published:2015-02-03

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Abstract: Based on the research of reservoir types and their distribution characteristics, oil-gas accumulation models and their main controlling factors in Wuerxun-Beier Depression were studied by analyzing the space allocation relation between oil-gas distribution and their accumulation conditions. The result shows that there are four kinds of oil-gas accumulation models in Wuerxun-Beier Depression: ①oil-gas accumulation model of fault trap in source area，mainly distributed in K1n1 of subdepression, and the main controlling factor of oil-gas accumulation is the development of fan delta front sand bodies K1n1 of the source area in subdepression; ②oil-gas accumulation model of fault trap out of source area，mainly distributed in K1n1of slope belt, and the main controlling factor of oil-gas accumulation is the development of sandstone pathway system connecting fault traps in slope belt and K1n1 source area in subdepression; ③oil gas accumulation model of bedrock cracks trap out of source area，mainly distributed in bedrock of paleo-buried hill flanking with K1n1 oil sources, and the main controlling factor of oil-gas accumulation is the development of bedrock of buried hill flanking with subdepression; ④oil-gas accumulation model of fault trap above source area，mainly distributed in K1d and part of K1n2 above K1n1 source area in subdepression, and the main controlling factor of oil-gas accumulation is the development of long-term development fault connecting fault traps in K1d and part of K1n2 with underlying K1n1 source area in subdepression.

Key words:  Lucaogou Formation, tight oil , overburden pressure porosity, overburden pressure permeability , Junggar Basin

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