Abstract: The buildup test data and field flow pressure information during production test are used to ascertain the fracture and matrix porosity volume within single well drainage area in fractured volcanic reservoir by means of Pollard-Pirson and influence functions methods. The results show that these methods can be applied to effectively make up the theoretical and technical limitations appeared in existing methods for ascertaining fracture and matrix porosity volumes in fractured volcanic reservoirs. It is significant to further study the reservoir geology, reservoir engineering and productivity performance in fractured volcanic reservoirs.

Key words: volcanic reservoir, method, function, porosity, volume