通过大量的岩心观察，结合薄片鉴定、扫描电镜等资料，开展了准噶尔盆地西北缘火山岩溶蚀孔隙特征及成因机制研究，认为该区火山岩溶蚀孔隙发育，具杏仁状充填气孔中溶孔、基质中溶孔、斑晶及角砾中溶孔、充填状裂缝中溶孔以及粒间溶孔等5种类型。熔岩中的长石斑晶、火山碎屑岩中的斜长石岩屑和由基质、火山灰水化形成的沸石类矿物在酸性介质条件下发生部分或全部溶蚀是溶蚀孔隙形成的内因，而酸性溶解液和流体介质通道的存在是溶蚀孔隙形成的外因。内因和外因共同作用导致溢流相溶解作用弱，形成的溶蚀孔隙数量少；爆发相溶解作用强。形成的溶蚀孔隙数量多。

Based on core observation，combined with rock section，cast thin section and scanning electronic microscope，the characteristics and genetic mechanism of volcanic dissolved pore in the northwestern margin of Junggar Basin are studied．It is considered that volcanic dissolved pores developed in this area，including dissolved pore in amygdaloidal filling hole，matrix dissolved pore，phenocrysts and breccia dissolved pore，dissolved pore in filling cracks and intergranular diss0lved pore．The phenocryst in the lava，the plagioclase debris contained in pyroclastic rock and the zeolite formed bv matrix and pozzolanic hydration occurred corrosion partly or completely in an acidic medium，which is the internal cause of dissolved pores。while the acidic solution and the channel for fluid media are the external cause． The interaction intema1 and external causes result in the poor dissolution of effusive facies and strong dissolution of explosive facies．