珠藏向斜的煤层气地质条件

his paper investigated gas-bearing properties of the Upper Permian coal seams in Zhuzang Syncline and analyzed the macroscopic geological controls such as the tectonism,sedimentation and hydrogeological effect of the gas-bearing properties.Inregion, CBM content is significantly controlled by the syncline structure, which results inthe lowest CBM content in the Hongmei well field of north syncline and higher in southern.CBM content is highest in Feisan well field and followed by in Feiyi. In the verticalsection, a sudden change in the gradient of CBM content occurs nearby the No.17 coal seam, by which two sets of the self-reliant CBM-bearing systems can be distinguished，one form No.6 to No.16 coal seam and another from No.16 to No.30 coal seam. Pressure state in coal-bearing strata changes greatly. Most of the strata is weak in water permeability, low in groundwater richness and low to modest in groundwater salinity.