Abnormal Overpressure and Hydrocarbon Pooling in Maxi Sag,Jizhong Depression
Received date: 2012-02-02
Revised date: 2012-03-09
Online published: 2012-08-10
In Maxi area,abnormal overpressure occurs widely in the lower Tertiary Shahejie Formation,including the second and third members of the Shahejie Formation,especially the upper of the third member of Shahejie Formation with pressure coefficient over 1.37.Laterally,the pressure coefficient decreases from central part of sag to the edge.The major cause of the overpressure is related to the hydrocarbon generation.Three functions of overpressure for hydrocarbon pooling in the sag follow as:improve reservoir property,enhance sealing capability,and provide the power for the deep hydrocarbon migration.Thus,the overpressure is important to hydrocarbon migration.We establish the pattern of overpressure-moderate pore-structural petroleum pool in the Rendong slope,the pattern of overpressure-moderate pore-lithological petroleum pool in the central part of Maxi sag,and the pattern of overpressure-moderate and high pore-structural and lithological composite petroleum pool in Nanmazhuang slope.
Key words: Maxi sag; Overpressure; Hydrocarbon accumulation; Accumulation pattern
HOU Feng-xiang,DONG Xiong-ying,WU Li-jun,LI Xiang-yang,HOU Feng-mei . Abnormal Overpressure and Hydrocarbon Pooling in Maxi Sag,Jizhong Depression[J]. Natural Gas Geoscience, 2012 , 23(4) : 707 -712 . DOI: 10.11764/j.issn.1672-1926.2012.04.707
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