68 / 2021-09-14 09:50:59

4D gas geological research on coal seam with gas hazard potential in mining panel

Gas geology,Prevention and control of gas hazard,Fine geological survey,4D analysis,Small geological structure

According to regulations of the mining industry in China, it is necessary to carry out gas extraction projects in advance when mining coal seams with gas hazard potential, and gas geological researches should be taken as the basic work for optimal design and effective construction of gas hazard prevention projects. Researches on coal seam with gas hazard potential have shown that anomalous geological area could be the gas hazard area as well, where superimposed tectonic and mining stress field usually results in disturbed coal and pressured gas. A 4D gas geological research method is put forward for finding out the anomalous geological area and assessing its gas risk. The method covers two ranges of gas geological research: fine geological survey and 4D analysis. The former includes a comprehensive prospect of concealed small geological anomalies ( such as small fault, small fold and coal thickness variation) by use of gas extraction engineering; The latter includes a dynamic forecast of gas hazard potential based on numerical simulation analysis of additional stress fields around small geological structures beyond coal mining face. From space-time perspective, the 4D gas geological research method has been applied to make a fine survey for anomalous geological area and to reveal the change law of gas geological condition in coal mining panel. Its research results make benefits for the optimal design and effective implementation of gas hazard prevention measures in coal mining panel with high coal and gas outburst potential.