煤的显微构造及其储集性能

利用扫描电子显微镜研究煤中微米级构造变形,揭示了煤的显微构造变形现象,如裂隙、角砾、碎粒、糜棱质、滑移面等。这些显微构造直接影响着煤的储集性能,裂隙和角砾的发育增加了煤中的大孔和中孔,提高了有效孔隙率;碎粒和糜棱质增加了煤的比表面积和甲烷吸附量,同时也有充填孔隙、堵塞通道的作用。研究显微构造在理论上可为煤层气生、储、运机理研究提供微观依据;在应用上可成为煤层气资源评价和开采的指标之一。 

MICROSTRUCTURES OF COAL AND THEIR RESERVOIR PROPERTY

Using the scanning electron microscope,the microstructure of coal is studied in the range of micron,as fracture,breccia,cataclast,mylonite and slip plane.These microstructures have the direct influence on the coal reservoir property.The fracture and bereccia increase medium large pores and effective porosity of coal;cataclast and mylonite increase specific surface and methane absorbability,at the same time,filling pore and plugging channel too.The microscopic evidences could be provided for studying the generation,storage,migration of coal bed methane theoretically,and should be an index for evaluating and extracting coal bed methane practically.