Formation Stages of Oilgas Reservoirs in Hailaer Basin，Inner Mongolia

Abstract

Abstract:

On the basis of illite dating method，hydrocarbon generated and hydrocarbon expulsed process and homogenization temperatures of fluid inclusion, the formation stages of oilgas reservoirs in Hailaer basin were studied. The results show that there are two main formation stages of oilgas reservoirs in Hailaer basin. The first stage is about 120-80 Ma, which is corresponding to the sedimentary period of Yimin Formationearly sedimentary period of Qingyuangang Formation, and it is the main formation time of oilgas reservoirs in Hailaer basin. The great majority of formation period of oil and gas is 105-90 Ma, which is corresponding to the secondthird segment sedimentary period of Yinmin Formation, and it is the abundant period of hydrocarbon generated and expulsed processes, in which the sufficient migration force is helpful to the formation of oil and gas reservoirs. The second stage is from the time that Qinyuangang Formation was deposited to now. During the second stage, the oilgas reservoirs formed in the first stage was adjusted, and at the same time the second formation process occurred in the oilgas reservoirs. The fine hydrocarbon，faults and sustained thick mudstone control the formation and distribution of oilgas reservoirs in the study area.

Key words: Hailaer basin, dating of illite, fluid inclusion, the formation stage of oilgas reservoir

CUI Jun-Beng, ZHONG Gao-Run, LIN Zhan-Li. Formation Stages of Oilgas Reservoirs in Hailaer Basin，Inner Mongolia[J]. Geoscience, 2012, 26(4): 801-807.

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