Effects of Mineral Composition on Movable Fluid Porosity in Micro-Nanoscale Porous Media

Quanqi Dai (), Yangwen Zhu, Yingfu He, Rui Wang, Da Zheng, Yinbang Zhou, Yunfeng Liu, Guiwen Wang and Hao Wu
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Quanqi Dai: State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 102206, China
Yangwen Zhu: State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 102206, China
Yingfu He: State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 102206, China
Rui Wang: State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 102206, China
Da Zheng: Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
Yinbang Zhou: State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 102206, China
Yunfeng Liu: State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 102206, China
Guiwen Wang: College of Geosciences, China University of Petroleum—Beijing, Beijing 102249, China
Hao Wu: School of Earth Sciences, Lanzhou University, Lanzhou 730000, China

Energies, 2023, vol. 16, issue 13, 1-11

Abstract: In natural micro-nanoscale porous media, the movable fluid porosity can effectively represent storage and permeable properties, but various mineral compositions have complicated effects on it. Taking saline lacustrine shale as an example, this study researched the effects of mineral composition on movable fluid porosity, based on nuclear magnetic resonance (NMR), focused ion beam (FIB), and x-ray diffraction (XRD) experiments. The results show that movable fluid porosity exhibits a stronger dependence on porosity than movable fluid saturation does. Micropores (<100 nm) and macropores (>1000 nm) are mostly developed in silicate and gypsum minerals, and have a highly heterogeneous distribution. In contrast, carbonate intercrystalline pores are dominated by mesopores (100−1000 nm), and behave strongly heterogeneously. Many mesopores play a positive role in generating highly movable fluid porosity, but the development of micropores and macropores is not conducive to an increase in movable fluid porosity. Overall, a significant negative effect is observed between silicate mineral content and movable fluid porosity, and carbonate mineral content has a strong positive effect on movable fluid porosity, whereas movable fluid porosity exhibits a relatively small reduction with an increase in the gypsum.

Keywords: micro-nanoscale porous media; movable fluid porosity; mineral composition; saline lacustrine; shale (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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