Discussion on the superiority of carbon dioxide geological storage between coal seam bifurcation and coalescence area

 China 's energy structure is dominated by coal. The large amount of CO₂ emissions leads to a deterioration of the environment. Sequestration of CO₂ into coal seams will be an effective measure to reduce emissions. In order to evaluate the potential of CO₂ sequestration in complex coal seams, taking the bifurcation and merging area of 15^# coal seam in Xinjing mining area as an example, firstly, the spatial distribution characteristics of coal seams are finely characterized on the basis of logging constrained wave impedance inversion and time-depth conversion technology. Then, the intelligent ant body technology is used to realize the effective prediction of the fault system. On this basis, the influence of coal seam thickness, structure, sealing conditions and other factors on CO₂ geological storage in the study area is discussed. The results show that the thickness of the bifurcation area of 15 ^# coal seam in Xinjing mining area is small and there is gangue, which is not conducive to CO₂ storage; the thick coal seam in the combined area has large gas storage space, moderate burial, simple structure and good sealing conditions of surrounding rock, which is a good place for CO2 storage. Therefore, the 15 ^# coal merging area is selected as a favorable area for storage, which provides a reference for the storage and injection of CO₂ in deep complex coal seams.