Origin and forming process of the porosity in volcanic hydrocarbon reservoirs of China

This paper wants to present an overview on the origin of porosity in volcanic gas reservoirs from main sedimentary basins of China, with an emphasis on volcanic gas reservoirs discovered during the last thirty years in China. A classification scheme and facies model based on the integrated diagenetic patterns-compositions-structures model is available for the deep volcanics in the Songliao Basin. However, we found that according to the models, various types of porosity formed in each location during complex diagenetic processes, and we show that it could be used as criteria for gas reservoir exploration.