INFLUENCE OF SHALE COMPONENTS ON THE PORE DEVELOPMENT DIFFERENCES BETWEEN WUFENG-LONGMAXI FORMATION AND NIUTITANG FORMATION: A Case Study of JY-1 Well in Southeast Chongqing and CY-1 Well in Northwest Hunan
XIE Zhi-tao1, HU Hai-yan2,3, YUAN Hao-pu4, LIU Ji-peng1, WANG Tao1, LIU Li-hang1
1. School of Geosciences, Yangtze University, Wuhan 430100, China; 2. School of Resources and Environment, Yangtze University, Wuhan 430100, China; 3. Hubei Cooperative Innovation Center of Unconventional Oil and Gas, Yangtze University, Wuhan 430100, China; 4. Xibu Drilling Engineering Co., Ltd., CNPC, Karamay 834000, Xingjian Autonomous Region, China
Abstract：Based on the accumulative pore volume and specific surface area by pore diameter of shale samples from JY-1 well of Wufeng-Longmaxi Formation and CY-1 well of Niutitang Formation, combined with the geochemical parameters and percentage of mineral components in samples, the paper analyzes the influence of shale components on the pore development differences between the two formations. The results show that TOC is positively correlated with micropores, indicating the organic micropores contribute to the development of shale pores, and organic micropores are more developed in the shale of Wufeng-Longmaxi Formation than that in Niutitang Formation. The positive correlation between quartz-pyrite contents and micropores indicates the primary pores and developed marginal pores contribute to the development of shale pores. The different correlations between quartz and meso-and macropores reveal the different protection degrees of quartz to the two by biogenic quartz content. The positive correlation between pyrite content and macropores reflects that pyrite can protect macropores to a certain extent in terms of pyrite content. The negative correlation between feldspar and pores shows the less obvious support of feldspar on pores due to the influence of compaction and complex structure. The unobvious correlation between carbonate minerals and pores shows the weak rigidity and instability of chemical properties and low content have no significant influence on pore development. Compared with Niutitang Formation, the high content of rigid minerals in the shale of Wufeng-Longmaxi Formation has a more favorable influence on the development of micropores (such as intergranular and marginal pores), mesopores and macropores. The negative correlations between clay minerals and micro- and mesopores indicate the intermineral pores easy to shrink under strong compaction have a negative effect on the pore development of reservoir, reflecting that the deep burial of Niutitang Formation has an unfavorable effect on the development of intermineral pores.
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XIE Zhi-tao, HU Hai-yan, YUAN Hao-pu, LIU Ji-peng, WANG Tao, LIU Li-hang. INFLUENCE OF SHALE COMPONENTS ON THE PORE DEVELOPMENT DIFFERENCES BETWEEN WUFENG-LONGMAXI FORMATION AND NIUTITANG FORMATION: A Case Study of JY-1 Well in Southeast Chongqing and CY-1 Well in Northwest Hunan. GEOLOGY AND RESOURCES, 2021, 30(2): 143-152.
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