Prediction method of methane geological law based on the multifractal singularity theory:An example from the Panyi Coalmine,Huainan coalfield,China

The gas occurrence in coal seams is constrained by multiple phases and various geo-logical factors. The dis- tribution of coal seam gas is characterized by regional zoning and local strong heterogeneity superposition. Local singu- larity is the main cause of gas accumulation anomalies and coal and gas outbursts. A new prediction method of gas ge- ology law was established using the theory of multifractal singularity. By studying the 13 -1 coal seam gas geology of Panyi Mine in Huainan Mining Area,the singularity of coal seam gas and its geological control mecha-nism had been discussed. The results show that the non-linear distribution and local enrichment characteristics of coal seam gas are essentially consistent with the singularity phenomenon in ge-ological processes. The multifractal singularity method can accurately describe the singularity and mutability of gas geology. The singularity characteristics of 13-1 coal seam gas occurrence were revealed through the research of Panyi Mine. The gas distribution in mines was divided into three are- as:normal area,dispersion area,and enrichment area. It was also found that the transition zone between the normal ar- ea and the high-enriched area is an area prone to coal and gas outbursts. The strong anomalous development of tectoni- cally deformed coal and the strong squeezing stress en-vironment reflected by high structural curvature are the main controlling factors that cause coal seam gas accumulation to enrich.