Reservoir space characters of Late Jurassic-Early Cretaceous volcanic rocks from Shengping area of Songliao Basin and their affecting factors
A lot of volcanic rocks developed in Shengping area of Songliao Basin from Late Jurassic to Early Cretaceous, including rhyolite, andesite and basaltic andesite, etc., formed from effusion facies, explosion facies and volcanic sedimentary facies. In the volcanic rocks, some kinds of primary porosity, secondary porosity and fractures developed, forming a reservoir spatial array dominated by the porosity-fracture type. The factors affecting the characteristics of the reservoir space mainly include tectonics process, active thermal fluid, lithologic characters and petrofacies. The volcanic rocks are important reservoir of natural gas in the Shengping area.