四川盆地元坝地区自流井组页岩储层孔隙结构特征

doi:10.11743/ogg20210412

Abstract

Abstract:

Shale of the Ziliujing Formation in Yuanba area of Sichuan Basin, currently at a critical stage of exploration, is one of the main research targets of terrestrial shale gas.As a significant index to evaluate the storage capacity of shale reservoirs, shale pore structure is the key to clarify the enrichment mechanism of shale gas.In this study, the pore structure is quantitatively characterized through an integration of total organic carbon (TOC) content tests, whole rock X-ray diffraction, combined experiment of N₂ adsorption and high-pressure mercury intrusion for pore size and scanning electron microscopy (SEM) after argon ion milling.The results show that the Ziliujing Formation shale is dominated by clay minerals, accounting for 38.8% to 67.3% with an average of 52.8%;the pores are mainly matrix pores, followed by organic pores, and with micro-fractures developed locally.The hysteresis loops of N₂ adsorption reflect the well development of parallel plate-like slit pores together with a small amount of ink bottle-shaped pores.The main interval of pore size distribution falls in mesopores.Compared with Dongyuemiao Member, Da'anzhai Member contains fewer micropores and more macropores, leading to a higher median value of pore size and pore volume, while a relatively smaller specific surface area (SSA).The pore volume and SSA of shale reservoirs in the Ziliujing Formation depend on clay minerals.The pore volume and SSA are in a negative correlation or irrelevant with the TOC content, mainly due to the infertility of organic pores in vitrinite and filament and the occupation of pore volume and adsorption sites by soluble organic matters.These will be of referential significance to the exploration of terrestrial shale gas in the study area.

Key words: pore structure, quantitative characterization, terrestrial shale reservoir, Ziliujing Formation, Yuanba area, Sichuan Basin

CLC Number:

TE122.2

Tao Jiang, Zhijun Jin, Guangxiang Liu, Zongquan Hu, Quanyou Liu, Zhongbao Liu, Pengwei Wang, Ruyue Wang, Tao Yang, Guanping Wang. Pore structure characteristics of shale reservoirs in the Ziliujing Formation in Yuanba area, Sichuan Basin[J]. Oil & Gas Geology, 2021, 42(4): 909-918.

Figures/Tables 10

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Pore structure characteristics of shale reservoirs in the Ziliujing Formation in Yuanba area, Sichuan Basin

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