Abstract: In recent years, oil and gas exploration of Carboniferous igneous reservoirs in Junggar basin has gradually shifted from basin margin to basin center. In order to more accurately determine the oil and gas reservoir distribution in the hinterland of the basin, a study on Carboniferous igneous reservoir distribution, reservoir development characteristics and its controlling factors is carried out in Mahu-Dabasong area based on aeromagnetic, seismic and logging data. The study results show that the Carboniferous strata are dominated by intermediate-basic igneous rock and volcanic sedimentary rocks and the igneous rock spreads out like a strip with the NNE-SSN direction. The reservoir spaces of the igneous rocks are mainly composed of secondary pores and the reservoir belongs to low porosity, low-extra low permeability reservoirs; The forming of effective reservoir is mainly controlled by igneous rock lithology and lithofacies, weathering time and diagenesis at the late stage; the igneous reservoirs of weathering crust are mainly developed in the explosive facies near craters and the effusive facies on the flanks of volcanoes