内蒙古东南部开鲁盆地龙湾筒九佛堂组火山岩地质特征

开鲁盆地为陆相火山岩盆地。勘探结果表明，在陆相火山岩盆地中获得了工业油流，为寻找石油油藏开辟了新途径。龙湾筒凹陷的火山岩以火山熔岩、火山碎屑沉积岩为主，根据岩石特征，可划分为三种岩相：溢流相、火山爆发相和火山沉积相。溢流相以熔岩为主，包括安山岩、粗面岩、粗安岩、玄武岩和玄武安山岩；火山爆发相岩石包括火山角砾岩和凝灰岩；火山沉积岩相岩石包括凝灰质砂岩、凝灰质泥岩。依据火山岩相划分，结合火山岩测井和地震反射特征，对龙湾筒凹陷火山岩纵向上的变化和平面上的展布进行了讨论，特别是对储集性能好的溢流相岩石进行了圈定。

GEOLOGICAL CHARACTERISTICS OF VOLCANIC ROCKS FROM JIUFOTANG FORMATION AT LONGWANTONG IN KAILU BASIN OF SOUTHEAST INNER MONGOLIA

Kailu Basin is a volcanic rock basin of continental facies. Exploration results show that in a volcanic rock basin of continental facies also can explored out industrial oil reservoir.So it explore a new avenue to seek oil reservoir. Longwantong depression is mainly composed of volcanic lava,volcanic clastic sedimentary rocks. On the basis of the characteristics of the rocks, it can be divided into 3 rock facies:volcanic effusive facies,volcanic eruption facies and vocanic sedimentary facies. The volcanic effusive facies,mainly composed of lava,including andesite,trachyte,trachy andesite,basalt and basaltic andesite;volcanic eruptive facies rocks include volcanic breccia and tuff;volcanic sedimentary facies rocks include tuffaceous sandstone and tuffaceous argillite.According to the subdivision of volcanic rock facies,the characteristics of well logging in volcanic rocks and of seismic reflection,the space time distribution of volcanic rocks has been discussed,especially the effusive facies rocks with a fine reservoir behaviour is outlined.