渤海湾盆地东营凹陷湖相富有机质页岩纹层特征和储集性能

doi:10.11743/ogg20220206

Abstract

Abstract:

The shale of the upper 4^th member of Shahejie Formation in the Dongying Sag， Bohai Bay Basin （Es^{4 U}） is studied to clarify the characteristics of shale laminae and their influence on reservoir properties through organic matter analysis， thin section observation， scanning electron microscopy （SEM） observation， high pressure mercury intrusion experiment and low-temperature nitrogen adsorption （LTNA）. The results will be of a theoretical basis to shale oil exploration and development. This shale interval （Es^{4 U}） can be divided into four lamina units different in composition and pore feature， and consequently seven types of lamina assemblages are concluded. The assemblage of granular calcite lamina， mixed lamina and organic lamina is of the best reservoir capacity in this interval with well-developed nano- and micro- pores. Its nano-pores are mainly composed of clay-mineral intergranular pores in the mixed lamina and constricted fissures of organic matters in the granular calcite lamina； while the micro-pores are mainly composed of micro-cracks in the mixed lamina and at the boundary of the granular calcite lamina. The assemblage of micrite calcite lamina and organic lamina ranks second in terms of reservoir property. Its nano-pores are dominated by rigid mineral intergranular pores in the micrite calcite lamina， and the micro-pores by the micro-cracks formed on inter-lamina weak surfaces. Under the effect of burial compaction， clay mineral transformation， calcite recrystallization and organic acid dissolution， the lamina assemblages are different in reservoir properties.

Key words: lamina assemblage type, lamina unit, organic matter, reservoir property, lacustrine shale, Bohai Bay Basin

CLC Number:

TE122.2

Yang Chen, Qinhong Hu, Jianhua Zhao, Mianmo Meng, Na Yin, Xiaobei Zhang, Gefei Xu, Huimin Liu. Lamina characteristics and their influence on reservoir property of lacustrine organic-rich shale in the Dongying Sag， Bohai Bay Basin[J]. Oil & Gas Geology, 2022, 43(2): 307-324.

Figures/Tables 5

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Lamina characteristics and their influence on reservoir property of lacustrine organic-rich shale in the Dongying Sag， Bohai Bay Basin

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