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

• Published in: Shi you shi yan di zhi Vol. 46; no. 1; pp. 202 - 214
• Main Authors: Shaoyun CHEN, Yongqiang YANG, Longwei QIU, Xiaojuan WANG, Baoliang YANG, HABILAXIM Erejep
• Format: Journal Article
• Language: Chinese
• Published: Editorial Office of Petroleum Geology and Experiment 01.01.2024
• Subjects: central sichuan basin; fractal dimension; jurassic; permeability; pore throat structure; shaximiao formation; tight sandstone
• ISSN: 1001-6112
• DOI: 10.11781/sysydz202401202

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