准噶尔盆地西北缘中拐—五八区火山岩主要发育于盆地基底的石炭系以及下二叠统佳木河组， 火山岩岩性主要有玄武岩、安山岩、凝灰岩、火山角砾岩、火山角砾熔岩、流纹岩等，少见部分侵入岩（如花岗岩）。火山岩储层的储集空间分原生和次生两大类，并以后者占主要地位，原生储集空间相互连通性较 差，部分次生储集空间由于受后期的风化、剥蚀、淋滤等作用，发育连通性较好的储层。研究区储集岩存在2 类储层孔隙结构：Ⅰ类孔隙结构的孔隙分选性较差；Ⅱ类孔隙结构的孔隙分选性相对较好，储层物性较好，总体来讲，研究区火山岩主要发育低孔、低渗储层。由于研究区火山岩埋藏较深，勘探难度较大，储层物性随时代的变新而逐渐变好。

Volcanic reservoir in Zhongguai-Wuba area in the northwestern margin of Junggar Basin mainly developed in Carboniferous and Jiamuhe Formation of Lower Permian. The volcanic rocks are mainly composed of basalt, andesite, eruptive tuff, volcanic breccia, volcanic breccia lava, rhyolite and a small quantity of intrusive rocks such as granite. The reservoir spaces are made up of primary and secondary spaces. The primary space has poor connectivity, while the secondary space developed reservoir with good connectivity, owing to weathering, denudation and leaching. The reservoir rocks have two types of pore texture. The typeⅠhas poor sorting, while the typeⅡ has good sorting and better properties. The volcanic reservoir in the study area belongs to lowporosity and lowpermeability reservoir. Because of the deep buries, the exploration of volcanic reservoir is different. The properties of volcanic reservoir become better while its age becomes younger.