THE FEATURE AND MEASUREMENTMETHODS OF POROSITY ANDRELATIVE PERMEABILITY OF COAL RESERVOIR

Coal gas reservoir is different from conventional gas reservoir.Coal is not only sourcerock but reservoir as well. As reservoir. there is special feature in pore texture in coal.And mechanism of accumulation and occurrence of gas in coal is also different from thoseof conventional gas reservoir on basis of comparison of coal gas reservoir with conventionalgas reservoir. the paper discussed the feature and measurement methods of porosity andrelative permeability of coal reservoir.