深埋藏气孔状流纹质熔结火山碎屑岩储层特征与成因分析——以准噶尔盆地西北缘夏72井区火山岩油藏为例  

Genetic Analysis of Deep Seated Vesicular Rhyolitic Igneous Pyroclastic Rocks——A Case Study of the Volcanic Reservoir in Wellblock Xia-72 at the Northwestern Margin of Junggar Basin

作　　者：肖毓祥[1,2] 李军[2] 陈再学 丛玉梅[4] 刘小燕[2] 

机构地区：[1]中国地质大学(北京)能源学院 [2]中国石油天然气股份有限公司勘探开发研究院,北京100083 [3]中油川庆钻探公司地球物理勘探公司国际勘探事业部,四川成都610213 [4]华北油田地质录井公司,河北任丘062552

出　　处：《石油天然气学报》2008年第5期22-26,共5页Journal of Oil and Gas Technology

摘　　要：埋深达4800m的准噶尔盆地西北缘夏72井区发育气孔状流纹质熔结火山碎屑岩储层。储层岩性主要为溢流相气孔状流纹质熔结凝灰岩和霏细质凝灰熔岩,塑变浆屑、塑变玻屑及凝灰岩角砾为其主要火山组分。综合分析表明,在不同熔浆组分、温度等条件下形成的浆屑气孔、玻屑气孔、角砾气孔及碎屑粒间(气)孔大小混杂分布,构成了储层主要储集空间类型。浆屑气孔多为厘米级,分为连通型和孤立型两种,毫米级玻屑气孔多呈扁长状,连通程度较差。研究区裂缝不发育,主要为冷凝收缩微裂缝和构造微裂缝。熔结成岩作用对各类气孔发育程度控制作用明显,充填和冷凝收缩成岩作用不但对原生孔隙具有一定程度的堵塞作用,而且对微裂缝的渗流能力抑制作用明显。The vesicular rhyolitic igneous pyroclastic rock reservoir,which was buried more than 4800m,occurred in Wellblock Xia-72 at the northwestern margin in Junggar Basin.The lithological rocks of volcanic reservoir were mainly composed of vesicular rhyolitic ignimbrites and felsitic tuffaceous lava of effusive facies,which mainly included plastic debris and plastic vitripyroclast,and subordinately tuffaceous breccia,volcanic pellet and ash.The results of research show that the pore spaces include different scales of debris pores,vitri-pyroclast pores,breccia pores and pyroclastic intergranular pores,which are controlled by the component of moltenlava and temperature,the main types of reservoir pores are formed.The debris pores are centimeter sized,that divide isolated and connected pores.The millimeter sized of vitri-pyroclast pores are prolate and the connectivity is lower than that of debris pores.The fractures are poor and the main types of fractures are shrinkable fractures and micro-structural fractures.The clinkery diagenesis is important for forming pores,infilling and condensing diagenesis not only have bridging action for pores,but decrease rapidly the permeability of fracture.

关 键 词：准噶尔盆地 火山岩 气孔 裂缝 储层特征 

分 类 号：P618.13[天文地球—矿床学]