Coal Bed Methane (CBM) is gas stored in coal layers, generally extracted from wells after hydraulic fracturing and/or CO2 or solvent injections. The Karaganda Basin was selected to develop CBM production because of its huge gas potential (4 300 Bm3 equivalent to 2 billion tons of coal, with gas content about 15-25 m3/t of coal (for comparison San Juan basin, US, has < 20 m3/t)). This work aims at modeling the Taldykuduk block coal layers focusing on CBM production. The methane extracted during mining actually released in the atmosphere, will be collected. A 3D geological model was built on Gocad/Skua using all available datasets (about 1000 wells over 84 km2, cross-section and maps acquired during coal exploitation, and fractures network reported on geological cross sections). The resulting 3D model including hundreds of faults, is used to simulate the secondary recovery of methane by CO2 injection on a flow simulator, assuming a two phase dimensionless formulation in a double porosity model with the matrix (m) and the fracture (f) for which the initial and boundary conditions are different. The resulting 3D models had helped in better understanding the regional tectonic structures, faults relationships, the hydrogeology regime and the potential gas reserves.


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