Research on Microscopic Pore Structure Characteristics and Influencing Factors of Shale Reservoirs: A Case Study of the Second Member of the Permian Lucaogou Formation in Malang Sag, Santanghu Basin

Xuejuan Zhang, Dandan Wang, Lei Zhang (), Yabing Xing, Yi Zhang, Weiming Wang, Yinglin Liu and Hongping Mao
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Xuejuan Zhang: School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
Dandan Wang: Unconventional Oil and Gas Science and Technology Research Institute, China University of Petroleum (Beijing), Beijing 102249, China
Lei Zhang: School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
Yabing Xing: School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
Yi Zhang: School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
Weiming Wang: Unconventional Oil and Gas and New Energy Research Institute, China University of Petroleum (East China), Qingdao 266000, China
Yinglin Liu: School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
Hongping Mao: School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China

Energies, 2023, vol. 16, issue 5, 1-16

Abstract: For the second member of the Permian Lucaogou Formation in Malang Sag, Santanghu Basin, we used field emission scanning electron microscopy (SEM), cryogenic nitrogen gas adsorption, and the micro/nano CT method, combined with the fractal theory, to depict the dense reservoir space types of the reservoir and the microcosmic pore structure characteristics, perform the quantitative evaluation of aperture size, pore shape, and connectivity, and to analyze the mineral composition of the micropore structure of the reservoir. The results show that the area is dominated by sandy/argillaceous dolomite, and the reservoir space types mainly develop dissolved intergranular pores and intergranular pores, a few microfractures, and parallel plate and slit nanoscale pores. There is a positive correlation between pore volume and specific surface area, with micropore volume accounting for 14.95%, mesopore volume at 82.47%, and macropore volume at 2.58%. The mesoporous volume provides the main pore storage space. The combined specific surface area of micropores and mesoporous pores accounts for more than 99% of the total specific surface area, providing almost all the pore surface area, which is the main site for shale oil and gas adsorption. The fractal dimension D value of the samples is between 2.39 and 2.49, and the pore distribution of shale is relatively uniform, mainly developing mesoporous pores. The specific surface area and average radius are positively correlated with the content of dolomite in mineral components. The results of the CT experiment also confirm that the pore throat of samples with high dolomite content is mostly a coarse tubular and banded distribution in three-dimensional space, with good connectivity.

Keywords: Santanghu Basin; Lucaogou Formation; microscopic pore structure; fractal characteristics (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
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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