济阳坳陷超压结构差异性及其控制因素

doi:10.11743/ogg20170302

Abstract

Abstract: Jiyang depression,one of the important petroliferous depressions in Bohai Bay Basin of eastern China,has the most complex and diverse pressure systems.Based on statistics of the measured pressures,log responses of mudstone overpressures and characteristics of over-pressure profiles of many sags in Jiyang depression,we divide the overpressure systems in Dongying,Chezhen,Zhanhua and Huinin sags into three types,namely the single high overpressure system,the compound overpressure system and the single low overpressure system.The single overpressure system distributes laterally in Dongying and Chezhan sags and occurs vertically as one overpressure zone in overpressure Es³-Es⁴,with a relatively large overpressure amplitude and a pressure coefficient over 1.8.The compound overpressure system distributes laterally in Chezhen sag and occurs vertically as three separate overpressure zones in Es¹,Es³ and Es⁴ respectively.The single low overpressure system distributes laterally in Huimin sag and occurs vertically as only one overpressure zone in Es³ with a comparatively small overpressure amplitude and a pressure coefficient less than 1.4.The dissimilarities of the overpressure structures in different sags are closely related to the sequences and the thermal maturities of source rocks,the distribution of pressure sealing layers,and the fault activities,in the sags.The distribution and thermal evolution of source rocks control the formation and distribution of the overpressure system.The pressure sealing layers control the top and bottom boundaries of an overpressure system.The deep-rooted faults control both the inside and outside horizontal boundaries.

Key words: formation pressure, overpressure system, rifted basin, Jiyang Depression

CLC Number:

TE121.1

Wang Yongshi, Qiu Yibo. Overpressure structure dissimilarity and its controlling factors in the Jiyang Depression[J]. Oil & Gas Geology, 2017, 38(3): 430-437.

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Overpressure structure dissimilarity and its controlling factors in the Jiyang Depression

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