Boundary Fault of the Steep Slope Zone and Its Control on Hydrocarbon Accumulation of the Lower Minghuazhen Formation of Neogene in the Miaoxibei Sag of Bohai Basin

doi:10.11885/j.issn.1674-5086.2015.11.17.01

Abstract

Abstract: Focusing on differential deposition and oil and gas accumulation in the shallow water delta of the Neogene Minghuazhen Formation in the steep slope zone of the Miaoxibei Sag, Bohai Bay Basin, this study analyzes the boundary fault combination style, fault activity, and influence of datum level change on sandstone stacking style and differences in oil and gas accumulation. The analysis showed that the formation is a favorable combination of hydrocarbon accumulation near source rocks, fault transporting, reservoir development, and late accumulation in the Neogene of the Miaoxibei Sag. The structures of the depression boundary faults, from the southern to the northern blocks, are seat, horsetail, and cascade types. Differences in paleogeomorphology and intensity of fault activity determine horizontal reservoir development in the northern blocks, and datum level change determines sandstone stacking style in the vertical direction. "Isolated" underwater distributary channel sand bodies developed in the early stage of the lower Minghuazhen Formation, sandstone reservoir with "laminations" developed widely in the middle stage, and in the late stage, the sand body is distributed with "similar sheets". The formation factors for integrated oil and gas accumulation are highest in the north blocks, good in the middle blocks, and poorest in the southern blocks.

Key words: Miaoxibei Sag, fault combination style, shallow water delta, differential deposition, accumulation difference

CLC Number:

TE122

ZHAO Ye, WANG Xin, GUAN Dayong, LIU Pengbo, WANG Guangyuan. Boundary Fault of the Steep Slope Zone and Its Control on Hydrocarbon Accumulation of the Lower Minghuazhen Formation of Neogene in the Miaoxibei Sag of Bohai Basin[J]. 西南石油大学学报(自然科学版), 2017, 39(2): 18-26.

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