松辽盆地北部地区火山岩特征及分布规律

通过松辽盆地北部火山岩的化学元素分析及薄自理鉴定，认为区内火山岩主要以中酸性火山岩为主（岩安岩、流纹岩、中生角砾凝灰岩、凝灰岩等），属于亚碱性系列中的钙碱性系列。其火山岩系列中的钙碱性系列是与板块俯冲作用有关的岩石系列，喷发方式以爆发相、喷溢相、近火山口相、次火山岩相、火山－沉积相为主，均为深层天然气藏的主要储集层。综合地球物理预测，全区火山岩呈现条带状展布的特征。

THE CHARACTERISTIC AND DISTRIBUTION RULE OF THE VOLCANIC ROCK IN THE NORTHERN PART OF SONGLIAO BASIN

This paper analyzes the chemical elements and appraise thin section of the volcanic rock in the northern part of Songliao Basin and indicates that the rock is mainly middle acid volcanic rock(dacite, rhyolite, middle acid brecciated tuff and tuff), belonging to the calc alkaline series of subalkaline series. The calc alkaline series of the volcanic rock series is the rock series related to plate subduction. The eruption patterns mainly includes burst facies, ejection and overflowing facies, near crater facies, sub volcanic rock facies and volcanic sedimentary facies, all of which are the main reservoirs of deep natural gas reservoirs. A comprehensive geophysical prediction shows that the volcanic rock in the whole area extends as strips.