This study showed the potential use of ventilation air measurements regularly monitored in underground coal mines coupled with numerical reservoir simulation. The work utilized readily available ventilation data as inputs to numerical simulation to estimate coal seam reservoir properties. A three-dimensional coalbed methane reservoir model was constructed for the Yeni Celtek mine, Turkey, from which ventilation data were obtained. Two of the ventilation monitoring stations in return airways were utilized as history matching points, and methane flow rates through these stations were used as history matching parameters. To match measured and predicted methane rates at these locations, several coal seam reservoir parameters were varied. Results showed that cleat permeabilities, desorption time, and Langmuir parameters were the controlling parameters affecting methane liberation into return airways in the coal mine. Prediction error tests using mean squared error and root mean squared error showed that the changes made to the base case parameters by Case 10 in Table 2 provided the best results. However, results of reservoir simulation may not be unique. Other parameters can also be varied in the simulations for history matching purposes. Although coal parameter changes made by Case 10 gave the best estimate, the values should be confirmed with well test interpretations or field production data, if available, for more accurate results of reservoir properties of the coal seam. Characterization of coal seam reservoir properties is an important step for planning degasification and coal mine methane production and utilization. To this end, this study is presented primarily as a demonstration that combines coal seam reservoir simulation with mine ventilation engineering.
Mining-industry; Underground-mining; Coal-mining; Ventilation; Ventilation-systems; Safety-practices; Methane-control; Methanes; Explosive-gases; Monitoring-systems; Statistical-analysis;
Author Keywords: Reservoir simulation; Coalbed methane; Coal mine methane; Mine ventilation; Coal reservoir properties; Mine safety