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Cleat systems are the main controlling factors in determining the porosity and permeability of coal rocks, and they also play a crucial role in determining the productivity of coalbed methane wells. Describing the development characteristics of cleats in deep coal rocks based on rock physical experiments, and studying the relationship between cleat development and characterization parameters, is of great significance for the interpretation and evaluation of deep coal rock reservoirs. This article takes the deep coal rocks of the BX group in the Ordos Basin as the research object, describes the cleat development in coal rock cores, and analyzes the factors influencing the degree of cleat development, including coal composition and coal rank. It reveals the relationship between sonic anisotropy coefficients, image fractal dimensions, and cleat development. The experimental results show that the degree of cleat development in the study area is mainly classified as well-developed to extremely well-developed. Cleat development in coal rocks increases with the rise in coal rank and fixed carbon content, and decreases with the reduction in ash and volatile matter content. The difference in maximum and minimum wave speeds tested in coal rock cores ranges from 100 to 800 m/s, with the P-wave fractional anisotropy coefficient ranging from 0 to 0.6. The sonic anisotropy intensifies as the cleat development increases. In recent years, scholars have successively proven that the fractal dimension of coal fractures ranges between 1 and 2. A fractal dimension closer to 2 indicates a higher complexity of coal rocks. The calculated fractal dimension of coal rocks ranges from 1.2 to 1.8, and it also increases with the degree of cleat development, consistent with previous research conclusions. The study results reveal the development characteristics and controlling factors of cleats in deep coal rocks, as well as the rock physical properties that characterize cleat development. This provides a certain basis for subsequent logging interpretation of coal rock reservoirs.

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Cleavage Characterization Parameters of Deep Coals in the BX Groups, Ordos Basin: Lab Measurements and Analysis

  • 会议论文

  • 发表日期：

    2025年

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  • Zi-yang Ni,
  • Wei Li,
  • Xiang-jun Liu,
  • Li-xi Liang,
  • Jian Xiong,
  • Yi Ding

摘要

Cleat systems are the main controlling factors in determining the porosity and permeability of coal rocks, and they also play a crucial role in determining the productivity of coalbed methane wells. Describing the development characteristics of cleats in deep coal rocks based on rock physical experiments, and studying the relationship between cleat development and characterization parameters, is of great significance for the interpretation and evaluation of deep coal rock reservoirs. This article takes the deep coal rocks of the BX group in the Ordos Basin as the research object, describes the cleat development in coal rock cores, and analyzes the factors influencing the degree of cleat development, including coal composition and coal rank. It reveals the relationship between sonic anisotropy coefficients, image fractal dimensions, and cleat development. The experimental results show that the degree of cleat development in the study area is mainly classified as well-developed to extremely well-developed. Cleat development in coal rocks increases with the rise in coal rank and fixed carbon content, and decreases with the reduction in ash and volatile matter content. The difference in maximum and minimum wave speeds tested in coal rock cores ranges from 100 to 800 m/s, with the P-wave fractional anisotropy coefficient ranging from 0 to 0.6. The sonic anisotropy intensifies as the cleat development increases. In recent years, scholars have successively proven that the fractal dimension of coal fractures ranges between 1 and 2. A fractal dimension closer to 2 indicates a higher complexity of coal rocks. The calculated fractal dimension of coal rocks ranges from 1.2 to 1.8, and it also increases with the degree of cleat development, consistent with previous research conclusions. The study results reveal the development characteristics and controlling factors of cleats in deep coal rocks, as well as the rock physical properties that characterize cleat development. This provides a certain basis for subsequent logging interpretation of coal rock reservoirs.