热作用下准东低阶煤渗透率动态演化及其煤岩学控制

煤炭地下气化（UCG）是一种重要的洁净化、流态化采煤方法。热作用下煤层渗透率是影响UCG采煤速率及气化工作面扩展的重要因素，其动态演化规律及煤岩学控制机制是目前亟待解决的关键科学问题。本次选择新疆准东低阶煤为研究对象，拟通过开展高温三轴渗透率物理模拟、热作用下煤层渗透率动态数值模拟、热作用产物及产率测试、热作用过程煤岩显微结构分类与表征、多孔半焦渗流数值模拟与物理模拟，研究热作用下低阶煤渗透率非均质动态演化规律，阐明热作用过程煤岩显微结构动态变化及流体流动特征，揭示热作用下准东低阶煤渗透率动态演化的煤岩学控制机理。项目研究成果将从渗透率角度为准东低阶厚煤层UCG气化反应区的科学布置提供建议，促进新疆洁净煤产业发展。

Underground coal gasification (UCG), an important selection for future low rank coal mining in Xinjiang, is an important method for purified and fluidized coal mining. Coal permeability under thermal effect is a vital factor that can influence the rate of UCG mining and the extension of gasification mining face. Its dynamic evolution law and the corresponding control mechanism of coal petrology is a vital scientific problem that is urgent to be solved. In this study, low rank coal of the eastern Junggar Basin will be selected as the research objective, and multiple measurements including physical simulation of permeability dynamic under triaxial condition, numerical simulation of coal seam permeability dynamic evolution under thermal effect, yield and composition tests of pyrolysis products, microscopic structure classification and characterization of coal experienced with thermal effect, numerical and physical simulation of fluid flow in porous char, will be conducted with the purpose to: (1) research the heterogeneous dynamic evolution law of permeability of low rank coal under thermal effect, (2) clarify the microscopic structure dynamic and fluid flow character of porous coal during thermal effect process, and (3) reveal the permeability dynamic evolution law and it’s petrology control mechanism of low rank coal in the eastern Junggar Basin. Scientific suggestions for the layout planning of gasification reaction zone, from the perspective of coal petrology, will be proposed, with the purpose of promoting purified coal industry development in Xinjiang.