Occurrence, Migration and Output Path of Gas and Water in Anthracite Coal in Fanzhuang and Zhengzhuang Blocks

Abstract

Taking the anthracite coal in Fanzhuang and Zhengzhuang blocks as the research object, the occurrence, migration and output path of gas and water in coal reservoir and its model were analyzed based on the permeability and nuclear magnetic resonance imaging experiments. The results show that the coal seam water in macropore and microscopic fracture with the pore diameter 10 μm; micropore and mesopore are the main occurrence spaces of CBM, and mesopore, microfracture and endogenous fracture are the main channels for migration and output of CBM, which are very important for migration and production of CBM. Among them, the development of pore and microfracture with the pore diameter >0.5 μm in coal reservoir of Fanzhuang and Zhengzhuang blocks is relatively weak, which restricts the gas production effect.

Keywords

• fracture
• pore
• permeability
• nuclear magnetic resonance imaging
• southern qinshui basin