【成果名称】
●英文名称● Characterizing the complexity assembly of pore structure in a coal matrix: principle, methodology, and modeling application
●中文名称● 煤基质孔隙结构复杂组构表征—原理、方法及建模应用
【论文摘要】
●英文摘要● The pore structure in a coal matrix is a dual-porosity system where fractures and pores coexist and feature scale-invariance properties, that would affect the occurrence and migration of coalbed methane (CBM) significantly. Therefore, it is of fundamental importance to well define complexity types and effectively characterize their assembly mechanism of pore structure in a coal matrix. Here we identify the pore structure in a coal matrix as a dual-complexity system consisting of original complexity and behavioral complexity independent to each other, where the former determines the scaling types of single-or dual-porosity structure, while the latter dominates the scale-invariance properties of self-similarity, self-affinity, and multifractality. Next we clarify the essentials of scale-invariance properties and unify the definition of behavioral complexity. By employing Voronoi diagrams, we develop a dual-porosity coupling algorithm to describe the original complexity, and set up a mathematical framework to characterize the complexity assembly in fractal dual-porosity media. For modeling demonstration, we select some typical coal samples from different reservoirs in China, extract the scale-invariance parameters and establish fractal topography based on mercury intrusion porosimetry (MIP) and N2 adsorption data. Using experimental tests, mathematical derivation and numerical simulations in combination, we reveal the principle and methodology for the characterization of the complexity assembly in a coal matrix.
●中文摘要● 煤基质孔隙结构是一种二元孔裂隙耦合系统，这严重制约着煤层气的产出，...
【成果亮点】
●亮点一● In this study, two types of complexities of the pore structure in a coal matrix are identified, which are the behavioral complexity and original complexity, respectively
●亮点二● In addition, the essentials of scale-invariance properties are explained to unify existing fractal models
●亮点三● ---
【成果出处】
●杂志● JGR-Solid Earth, 2020
●DOI● https://doi.org/10.1029/2020JB020110
【论文作者】
赵梦余、金毅、刘仙鹤、郑军领、刘顺喜
