Abstract: The reservoir characteristics of Carboniferous volcanic rocks in Dixi area of Junggar basin are analyzed from lithology, electrical property, lithofacies, pore types and reservoir physical property by core, thin section, conventional log and FMI imaging technique, including explorative methods of seismic facies and patterns of lithofacies characteristics for volcanic rocks as well as the pore volume type and affecting factors of the volcanic reservoir. The study shows that the volcanic reservoir rocks compose mainly of acidic rocks and volcanoclastic rocks, with pore types of secondary pores and fissures, vesicular and microfissure reservoir spaces. The main affecting factors to reservoir physical property are lithology, lithofacies, eruptive environment and late-stage erosion, eluviation and fault reconstruction.

Key words: Junggar basin, volcanic rock, reservoir, lithofacies, Carboniferous