济阳坳陷惠民凹陷新生代沉积-沉降中心迁移规律及其机制

doi:10.11743/ogg20160407

Abstract

Abstract: Based on analysis on regional geology,strata thickness,sedimentary characteristics and faulting intensity of Huimin sag,this paper studied the characteristics of structural activities and the depocenter migration patterns in different evolutionary periods of Huimin sag and explained their geodynamic mechanisms.New methods were proposed for delineation of depocenters.There were two dynamic depocenters or subsidence centers in Huimin sag in the Cenozoic era.The depocenters and subsidence centers basically coincided with each other except for Es⁴ period.The depocenters had migrated to the southwest of Linyi,while the subsidence centers were still in the west of Zizhen during the Es⁴ period.The Es⁴-Es³ periodwas an important transition period for the migration of subsidence centers which migrated mainly along the N-S direction.In contrast,the migration was mainly along the E-W direction during Ek-Es⁴ period and Es³-Ed period.In the western part of the sag,the depocenters migrated in "S"-shaped trajectory,while in the eastern part,they migrated anticlockwise.Sag-controlling faults were mainly active during Ek and Es⁴ period,while subsag-controlling faults were predominant in Es³-Ed period.Both the sag-controlling and subsag-controlling faults were controlled by the NNW-trending extension structure and the right lateral strike-slip of Lanliao fault and Tanlu fault.And it was related to mantle convection caused by the velocity and angle changes of the Pacific plate subducting to the Eurasian plate and the collision of India-Eurasia plate.

Key words: migration mechanism, depocenter, subsidence center, fault activity, Cenozoic, Huimin Sag, Bohai Bay Basin

CLC Number:

TE121.2

Lin Yuxiang, Zhao Chengjin, Zhu Chuanzhen, Wu Yuchen, Li Jia, Li Xiuqin. Migration pattern and geodynamic mechanism of Cenozoic depocenter and subsidence center in Huimin Sag,Bohai Bay Basin[J]. Oil & Gas Geology, 2016, 37(4): 509-519.

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Migration pattern and geodynamic mechanism of Cenozoic depocenter and subsidence center in Huimin Sag,Bohai Bay Basin

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