Abstract: Volcanic gas reservoir is generally characterized by serious heterogeneity, great permeability difference, complicated distribution of gas and water, complex productivity distribution and big differences of well-controlled reserves by exploitation. Therefore, the well performance of volcanic gas reservoir is hard to analyze using the conventional gas reservoir decline analyses such as exponent, hyperbolic and harmonic decline methods. This paper presents single well performance analysis method for the volcanic gas reservoir based on flowing material balance. Furthermore, Blasingame curve is introduced to diagnose the gas flow characteristic section in such a well and enhance the reliability for parameter estimation. The reservoir permeability, wellbore skin factor and dynamic reserves can be obtained with the new well performance analysis method, which are of significance for the volcanic gas reservoir development.

Key words: volcanic gas reservoir, material balance, performance analysis, Blasingame curve