箕状断陷盆地形成机制、沉积体系与成藏规律——以济阳坳陷为例

doi:10.11743/ogg20140302

Abstract

Abstract:

The sedimentary basins in eastern China(like Jiyang Depression)are characterized by dustpan-shape with marginal faults and vertical overlapping architecture.These basins formed due to the subduction of Pacific Plate under China continent,which caused crust stretching and thinning,and further resulting in a series of extension of faults.In dustpan-shaped rift basin,the tectonic intensity varies in different structural belts.Therefore,the sedimentary systems and their assemblages under their control correspond well with the palaeogeomorphology.Due to the control of tectonic evolution and depositional characteristics,the traps,carrier system and the accumulation dynamics show some orderliness of distribution,which determines the orderliness of reservoir type distribution.Secondly,the differences of the major hydrocarbon accumulation controlling factors and their assemblages between different structure belts generate the differences of hydrocarbon accumulation and reservoir patterns between different plays.Moreover,different types of subtle reservoirs are deve-loped at different structural belts.Specifically,conglomerate fan reservoirs in the steep slope belt show hydrocarbon accumulation pattern featured by diagenetic sealing.The turbidity fan reservoirs in the central-depression belt show the hydrocarbon accumulation pattern featured by pressure-subtle migration.And the beach-bar sand bodies in the gentle slope belt show hydrocarbon accumulation pattern featured by control of three elements,i.e.faulted structures,effective reservoir,and formation fluid pressure.In conclusion,the petroleum geologic features of the Paleogene dustpan-shaped rift basins in east China can be sum up as follows:regularity in the evolution of basin,correspondence in sedimentary system,orderliness of reservoir type distribution,and difference in key factors controlling hydrocarbon accumulation.

Key words: dustpan-shaped fault depression, basin structure, sedimentary system, reservoir type, petroleum accumulation, Jiyang Depression

CLC Number:

TE12

Song Guoqi, Hao Xuefeng, Liu Keqi. Tectonic evolution,sedimentary system and petroleum distribution patterns in dustpan-shaped rift basin：a case study from Jiyang Depression,Bohai Bay Basin[J]. Oil & Gas Geology, 2014, 35(3): 303-310.

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Tectonic evolution,sedimentary system and petroleum distribution patterns in dustpan-shaped rift basin：a case study from Jiyang Depression,Bohai Bay Basin

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