东海盆地西湖凹陷中央反转构造带异常高压与油气成藏的耦合关系

doi:10.11743/ogg20170317

Abstract

Abstract: Abnormal overpressure is generally developed in the Huagang and Pinghu Formations of the central overturned structural belt in Xihu Sag,East China Sea Shelf Basin.Oil & gas shows have been reported frequently in these overpressured formations.Formation pressure and pressure profiles of single wells in the formations were calculated and established through Eaton method and based on acoustic well logging,geochemical and testing data,and pressure distribution (both lateral and horizontal) of the area was also defined under the constraint of measured pressure data of the formations.Vertically,the abnormal pressure mainly initiates in the lower member of the Huagang Formation,and increases in stepwise way upwards;and laterally,its top boundary deepens from south to central of the belt.The PetroMod software was employed to simulate the evolution of the formation residual pressure.The results suggest that periods of 13-9 Ma and 4-0 Ma be the key pressure incremental stages.A combination of the above mentioned research with the history of hydrocarbon charging in the area indicates a well match between the times of large scale hydrocarbon charging and pressure increase.A coupling relationship between the abnormal high pressure evolution and hydrocarbon accumulations is finally defined.

Key words: abnormal overpressure, hydrocarbon accumulation, coupling relationship, central overturned structural belt, Xihu Sag, East China Sea Basin

CLC Number:

TE122.3

Chen Zhiyuan, Xu Zhixing, Xu Guosheng, Xu Fanghao, Liu Jinshui. Coupling relationship between abnormal overpressure and hydrocarbon accumulation in a central overturned structural belt,Xihu Sag,East China Sea Basin[J]. Oil & Gas Geology, 2017, 38(3): 570-581.

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Coupling relationship between abnormal overpressure and hydrocarbon accumulation in a central overturned structural belt,Xihu Sag,East China Sea Basin

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