Pore throat structure analysis and permeability prediction method of tight sandstone: a case study of Jurassic Shaximiao Formation in central Sichuan Basin

CHEN Shaoyun; YANG Yongqiang; QIU Longwei; WANG Xiaojuan; YANG Baoliang; Erejep HABILAXIM

doi:10.11781/sysydz202401202

Volume 46 Issue 1

Jan. 2024

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CHEN Shaoyun, YANG Yongqiang, QIU Longwei, WANG Xiaojuan, YANG Baoliang, Erejep HABILAXIM. Pore throat structure analysis and permeability prediction method of tight sandstone: a case study of Jurassic Shaximiao Formation in central Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(1): 202-214. doi: 10.11781/sysydz202401202

Citation:

CHEN Shaoyun, YANG Yongqiang, QIU Longwei, WANG Xiaojuan, YANG Baoliang, Erejep HABILAXIM. Pore throat structure analysis and permeability prediction method of tight sandstone: a case study of Jurassic Shaximiao Formation in central Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(1): 202-214. doi: 10.11781/sysydz202401202

Citation:

CHEN Shaoyun, YANG Yongqiang, QIU Longwei, WANG Xiaojuan, YANG Baoliang, Erejep HABILAXIM. Pore throat structure analysis and permeability prediction method of tight sandstone: a case study of Jurassic Shaximiao Formation in central Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(1): 202-214. doi: 10.11781/sysydz202401202

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Pore throat structure analysis and permeability prediction method of tight sandstone: a case study of Jurassic Shaximiao Formation in central Sichuan Basin

doi: 10.11781/sysydz202401202

1.
School of Geosciences, China University of Petroleum (East China), Qingdao, Shandong 266580, China
2.
National Key Laboratory of Deep Oil and Gas, Qingdao, Shandong 266580, China
3.
Research Institute of Exploration and Development, PetroChina Southwest Oil & Gas Field Company, Chengdu, Sichuan 610041, China

Received Date: 2023-07-28
Rev Recd Date: 2023-12-01
Publish Date: 2024-01-28

Abstract

Abstract

Subtle characterization of pore throat structure and permeability prediction of tight sandstone reservoir are the key for quality reservoir evaluation and development. Taking Jurassic Shaximiao Formation in central Sichuan Basin as an example, the pore throat structure is statically characterized by HPMI and fractal theory. The relations among pore throat structure, fractal dimension and reservoir physical property are discussed, the contribution of pore throat structure to permeability is analyzed, and a permeability prediction model is established. The samples of Shaximiao Formation can be divided into four types: type Ⅰ samples have low displacement pressure, favorable physical properties and good pore connectivity; the average fractal dimension is 2.11, the pores are mainly macropores and mesopores with radius >0.1 μm, and the pore throat with radius >1 μm contributes more than 90% of the permeability. As for type Ⅱ samples, the displacement pressure are 0.4-1.0 MPa, the average porosity and permeability are 9.72% and 0.375×10^-3 μm², respectively, and the fractal dimension is 2.20; the mesopore content increases and mesopores contribute most of the permeability. The displacement pressure and fractal dimension of type Ⅲ and Ⅳ samples are significantly higher than those of type Ⅰ and Ⅱ samples, and the low porosity and lack of macropore lead to low permeability. The macropores and mesopores with radius > 0.1 μm contribute more than 98% of the permeability of Shaximiao Formation. Fractal dimension is a good indicator of pore throat structure. Fractal dimension is significantly negatively correlated with pore throat radius, maximum mercury saturation and permeability, and is positively correlated with displacement pressure and relative separation coefficient of pore throat. There is a strong correlation between fractal dimension and pore throat composition, and a permeability quantitative prediction model based on fractal dimension, porosity and maximum pore throat radius is established.
- fractal dimension,
- pore throat structure,
- permeability,
- tight sandstone,
- Shaximiao Formation,
- Jurassic,
- central Sichuan Basin

All authors disclose no relevant conflict of interests.
CHEN Shaoyun, YANG Yongqiang and QIU Longwei carried out the tasks of formulating research ideas and analyzing data. WANG Xiaojuan provided some of the raw data of the study area, pointed out the connection between the actual problems of the study area and the content of the study. YANG Baoliang and Erejep HABILAXIM organized part of the data and participated in the drawing of pictures. CHEN Shaoyun and YANG Yongqiang participated in writing and revising the paper. All the authors have read the last version of paper and consented for submission.

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References(44)

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Pore throat structure analysis and permeability prediction method of tight sandstone: a case study of Jurassic Shaximiao Formation in central Sichuan Basin

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Pore throat structure analysis and permeability prediction method of tight sandstone: a case study of Jurassic Shaximiao Formation in central Sichuan Basin

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