Exploration of hidden structure and prediction of gas anomaly area based on gas control projects

The investigation of hidden structures and the prediction of gas abnormal area form the foundation of gas disaster prevention engineering. In accordance with the laws and regulations governing coal mining in our country, a gas pumping project must be implemented prior to mining coal seams with a gas hazard. Typically, geologic anomaly area represent gas hazard zones, where the combination of tectonic stress field and mining-induced stress field can disturb coal bodies and pressurize gas. To accurately locate geologic anomaly areas and evaluate their gas disaster potential, a gas geologic anomaly survey method has been proposed based on gas extraction projects. This method uses drilling parameters and records to calculate the coordinates of the control points of the coal seam roof and bottom, and then utilizes two-dimensional projection diagrams and three-dimensional stress field models to survey and forecast small, hidden geological structures (such as small faults, folds, and locally abnormal coal thicknesses). By analyzing the additional stress field surrounding small geological structures, gas disaster potential can be dynamically predicted. The application of this method enables the detailed investigation of geological anomalies and reveals the general pattern of gas geological evolution at coal mining worksites. The research results provide a scientific basis for the optimal design and effective implementation of disaster prevention and control measures for coal seams with high gas content or at risk of gas outbursts.