Gas content modeling of No.3 coal seam in district 3 of southern Shizhuang block

The gas content of coal seam has a direct impact on the development of coalbed methane. The gas content of coal seam in southern Shizhuang block is high, but there are many inefficient wells in the development process, and the 3D geological modeling of gas content can help determine the influence of gas content on the production of CBM wells. In this paper, the research object is the No.3 coal seam in southern Shizhuang block. Calculated gas content from linear multivariate regression by using parameters of ash content, volatile matter content and fixed carbon content and simple burial depth matches well with laboratory measured values, and the coal proximate analysis parameters were predicted by log data. Finally, the gas content prediction equation of southern Shizhuang block based on logging data was established, and the equation was used to predict the gas content of No.3 coal seam in the research area. The predicted value is closed to the measured value. Then construction of gas content model based on the predicted value with Petrel software, and the 3D distribution characteristics of gas content in No.3 seam were analyzed. The research shows that the gas content of No.3 coal seam in the block is between 11-20 m³/t. The main control factors of gas content in the study area are the burial depth and the structural position. The model has guiding significance for the determination of low production factors of coalbed methane wells in the study area and the development of coalbed methane.