The Controlling Effect of Synsedimentary Normal Faults on Regional Gas Occurrence

Taking the Guodishan Fault as an example, the regional geological evolution background and measured gas parameters were analyzed, and the gas occurrence characteristics in the region and the control effect of synsedimentary faults on regional gas were studied. Research has shown that the gas occurrence in the control area of the Guodishan Fault is complex and has obvious zoning characteristics, and its syndepositional characteristics and geological movements have a significant impact on the generation and preservation of coal gas. The gas content and pressure in the area controlled by the fault gradually weaken from the severely affected areas of the hanging wall to the footwall, then to the moderately and weakly affected areas of the hanging wall. Warning values for coal and gas outburst are reached at the burial depths of 285, 420, 577, and 1717 m, respectively. It is worth noting that gas anomalies frequently occur in the moderately affected areas, so coal and gas outburst may occur above the warning burial depth.