松辽盆地升平地区J_3-K_1火山岩储集空间特征及影响因素

Reservoir space characters of Late Jurassic-Early Cretaceous volcanic rocks from Shengping area of Songliao Basin and their affecting factors

升平地区发育有大量的J_3-K_1火山岩,主要包括流纹岩、安山岩、玄武安山岩和凝灰岩,由火山溢流相、爆发相和火山沉积相组成。其中发育多种原生孔隙、次生孔隙和裂缝,构成以孔隙裂缝型为主的储集空间组合。影响储集空间特征的因素主要包括构造作用、热液活动、岩性和岩相。升平地区的火山岩是重要的天然气储集层。

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, lithologie characters and petrofacies. The volcanic rocks are important reservoir of natural gas in the Shengping area.