渤海湾盆地东濮凹陷沙三段泥页岩储层孔隙微观特征及其对油气滞留的意义

doi:10.11743/ogg20190107

Abstract

Abstract:

The Es³ shales in Dongpu Sag were studied with XRD analysis,thin section and SEM observation,and low-temperature nitrogen adsorption experiment based on their basic geochemical characteristics.Microscopic characteristics of shale pores were analyzed,and thus controlling factors of shale pore development and its significance for hydrocarbon retention in shales have been identified.Results show:the Es³ shales in Dongpu Sag can be classified into silty shales,calcareous shales and gypsum shales according to their mineral compositions;the strong heterogeneity in shales'geochemical characteristics reflects a complex hydrocarbon retention pattern in Es³ shales;several pore types including interparticle,intraparticle and organic-matter pores and fractures,are identified in Es³ shales with different lithologies dominated by different pore types;the pore systems in Es³ shales can be dominated by micropores,macropores,or pores of multiple diameters based on low-pressure nitrogen adsorption experiment;pore development in Es³ shales is affected by both deposition and diagenesis,with deposition environment laying the foundation for pore development in various lithologies and diagenesis modifying pore structures during shale burial,respectively;oil and free gas mainly accumulate in large pores and microfractures,and micro-and meso-pores provide sites for adsorbed gas,while solution gas is of great significance to develop shale oil/gas resources.

Key words: shale, microscopic characteristic of pores, Es³, hydrocarbon enrichment, Dongpu Sag, Bohai Bay Basin

CLC Number:

TE122.2

Shao Xinhe, Pang Xiongqi, Hu Tao, Xu Tianwu, Xu Yuan, Tang Ling, Li Hui, Li Longlong. Microscopic characteristics of pores in Es³ shales and its significances for hydrocarbon retention in Dongpu Sag,Bohai Bay Basin[J]. Oil & Gas Geology, 2019, 40(1): 67-77.

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Microscopic characteristics of pores in Es³ shales and its significances for hydrocarbon retention in Dongpu Sag,Bohai Bay Basin

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Microscopic characteristics of pores in Es3 shales and its significances for hydrocarbon retention in Dongpu Sag,Bohai Bay Basin

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Microscopic characteristics of pores in Es³ shales and its significances for hydrocarbon retention in Dongpu Sag,Bohai Bay Basin