渤海湾盆地古近系油气富集差异性及主控因素

doi:10.11743/ogg20200202

Abstract

Abstract:

The differences of hydrocarbon accumulation in distribution horizon and enrichment degree are obvious in a petroliferous basin.Based on previous studies, we discuss the differential hydrocarbon enrichment and its major controlling factors of the Paleogene in various depressions of the Bohai Bay Basin.The results show that the petroliferous depressions can be divided into three patterns in terms of hyrdrocarbon accumulation, namely the enrichment patterns of the Pre-Paleogene, of the Paleogene and of the Neogene, with the second pattern taking the lead.The Paleogene hydrocarbon accumulation is characterized by "rich east but poor west" and "high heterogeneity in vertical distribution"-horizontally speaking, hydrocarbons concentrate in the eastern part (rich in hydrocarbon) of the basin; vertically, they mainly accumulate in source rock sequences and the adjacent Es² and Es³, and diminish herein upwards and downwards.The diffe-rential hydrocarbon enrichment of the Paleogene in different depressions is jointly controlled by multiple factors:the conditions for hydrocarbon generation are the fundamental one; the differential geothermal fields and source rock thermal evolution are the key to the differential hydrocarbon enrichment of "rich east but poor west"; and the differential hydrocarbon generation potentials of different source rock sequences, major source rock interval, source rock-reservoir-caprock assemblage, and carrier faults, collectively determine the vertical enrichment of hydrocarbons in the basin.

Key words: hydrocarbon distribution, differential hydrocarbon enrichment, fault transport, major controlling factor, Paleogene, Bohai Bay Basin

CLC Number:

TE122.3

Youlu Jiang, Shengmin Su, Hua Liu, Yongshi Wang, Xiaojun Cui. Differential hydrocarbon enrichment of the Paleogene and its main controlling factors in the Bohai Bay Basin[J]. Oil & Gas Geology, 2020, 41(2): 248-258.

Figures/Tables 8

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Differential hydrocarbon enrichment of the Paleogene and its main controlling factors in the Bohai Bay Basin

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