Abstract: The model to predict the relation between coal seam floor elevation and gas content is established by fitting the existing data of coal seam gas. By using the model， the gas content distribution in main coal seam 8^# is predicted according to coal floor elevation data obtained through seismic interpretation. Through the latter data validation， the prediction accuracy is found to be above 85%. The result show that the greater the distance to fault the higher the prediction accuracy， in which the error is between -1.86m³/t and 4.32m³/t. It is considered that the coal gas content is controlled by coal floor elevation， besides， the complex small-scale faults have two effects that may induce gathering or scattering of coal bed methane. So distribution of geologic structures should be considered as the priority for CBM target in the study area.

Key words: Julian Muai area, CBM, gas content, seismic interpretation, controlling factors