Study On Gas Geology Regularity Of Huanglong Jurassic Coalfield

Gas was not only a kind of clean energy，but also harmful gas,which was seriously threatminer’s safety.But to scientificly use gas,to protect miner’s safety,we must first make clear gasdistribution rule.Through analyzing gas materials from production and test,studied the basiccharacteristics of Huanglong Jurassic coalfield about gas occurrence.According to structurecontrolling gas theory and grey incidence theory,studied the control law of structure to gasoccurrence.It is concluded that:（1） In Huanglong Jurassic coalfield,regional tectoniccontrolled gas distribution.In shallow seam area,coal seam methane content and mine gaspour amount were lower;（2）It was apparent that geological structure progressive controlledstructure,regional tectonic controlled coal field distribution and structural development,coalfield regional structural further controlled coal mine structure;（3）Geologic structures,especially fold,had an characterstic long-lasting inheritance,and it was factor-controlling ofgas;（4）Burial depth and thickness of coal were main factors of gas;（5）Coal bearingformation had good lithologic trap to water and gas,because Country rock wre competent andbad ventilation;（6）Applying the method of Geographic Information Systems to forecast coalgas content and its distribution of mining area.Based on GIS,establish coal seam gas contentforecast method and GIS evaluation system,complete the forecast to coal gas content anddistribution of the study area.Mining verified forecast conclusion.