Favorable layers analysis of unconventional gas in coal measure strata insouthern Sichuan based on well CGD-1

The effective development of the unconventional gas in coal measure strata can decrease the cost of developing natural gas in coal-bearing basin, improve the utilization of single well and increase the supply of clear energy.Based on Well CGD-1 drilled in Southern Sichuan, well test results and experimental analysis of the core samples, the coal properties, porosity, permeability, gas content and absorbability are studied.At last, the favorable layers are analyzed.The results show that the micro-pores dominate the coal porous space, which is beneficial to gas aggregation.The connectivity is weak because of few seepage pores.The developing potential of some coal seams and shales is considerable due to high gas content.However, stimulation method is needed to improve reservoir permeability.No.C₆₊₇and C₈coal seams are the most perspective layers.The No.C₁coal seam and its adjacent shales are the second most perspective layers.This paper can provide basis for deep research of the unconventional gas of coal measure strata of Southern Sichuan.