Gas anomaly analysis and gas geological division of No.2 2 coal seam in Shunhe Coal Mine

In order to improve the effective hierarchical management level and gas prevention technical level of mine gas zoning control, combining geological condition and geological structure distribution of Shunhe Coal Mine, based on the theory of gas geological regionalization and gas geological index quantification technology, using the theories and methods of mathematical statistics and gas geology, the geological structure evolution of No.22 coal seam was analyzed.The geological control characteristics of gas occurrence and the geological influence factors affecting gas anomaly distribution were discussed.The crucial controlling factors affecting gas anomalies were screened according to quantitative theory I.Based on this, a mathematic model to predict gas anomaly area was established and validated.Gas geological zoning was carried out in the unmined area.The study results showed that the boundary of large-medium faults were gas geological unit boundaries for controlling the gas zoning, the whole mine field was divided into six gas geological units, there were two partial positive gas anomalies zones in ③ unit and one positive zone near magmatic intrusion in the east of ① and ② units, and ④ and ⑥ unit were gas negative anomaly area.The lithology distribution of the coal seam roof, bed rock thickness and fault range in the mine field were the main controlling factors of gas anomalies.Bed rock thickness and magmatic intrusion are the main factors of gas negative anomaly, reverse folds control the buried depth of 22 coal seam.