Based on the petrological characteristics and sequence features, the volcanic facies and logging response characteristics ofCarboniferous inNiudongarea are analyzed. There are four volcanic facies in the the studyarea: effusive facies, eruption facies, empty accumulative facies and volcanic sedimentary facies, which can be well distinguished by logging curve GR and DEN. And volcanic sedimentary facies can get better response by Rt. The volcanic reservoir spaces include primary and secondary accumulation spaces. The primary accumulation spaces mainly include air pores, intercrystal pores, shrinkage pores and fractures. The secondary accumulation spaces mainly include dissolved pores, structural fractures and weathered fractures. The main factors for forming high quality volcanic reservoirs are magma composition, effusive facies belt and later reformation. Andesite, formed by intermediate rock with high viscosity, slow fluidity and slowgas dispersion, is the optimum reservoir. The end period of eruptive cycle is the favorable period for forming amygdaloid body, gas hole and auto-fracture. The weathering and eluviation in the period of eruptive cycle provide forming conditions for various corrosion pores. The genetic mechanism of volcanic reservoir space is of significance for seeking volcanic reservoirs.