准噶尔盆地西北缘中拐凸起石炭系火山岩储层特征及主控因素  

Characteristics and Main Control Factors of Carboniferous Volcanic Reservoirs of Zhongguai Uplift in the Northeastern Margin of Junggar Basin

作　　者：姚卫江[1] 范存辉[2] 党玉芳[1] 秦启荣[2] 赵玲 

机构地区：[1]中石油新疆油田分公司勘探开发研究院地球物理研究所,新疆乌鲁木齐830013 [2]西南石油大学资源与环境学院,四川成都610500 [3]中石化西南油气田分公司工程监督中心,四川德阳618000

出　　处：《石油天然气学报》2011年第9期32-36,165,共5页Journal of Oil and Gas Technology

基　　金：国家油气重大专项(2008ZX05001)

摘　　要：准噶尔盆地西北缘中拐凸起是在石炭纪至早二叠世挤压应力场作用下形成的宽缓鼻状古隆起,是油气运移和聚集的有利指向区。工区火山岩岩石类型复杂多样,既有火山熔岩、火山碎屑岩,又有侵入岩。火山碎屑岩包括凝灰岩和火山角砾岩;火山熔岩主要包括安山岩和玄武岩,侵入岩主要包括花岗岩和辉绿岩。工区火山岩储层储集空间主要包括次生溶孔、裂缝以及少量原生孔隙(晶间孔、砾间孔、残余气孔等),储层以低孔-低渗(或特低渗)储层为主,储层非均质性强,其中火山角砾岩和安山岩储层物性相对较好,其次是凝灰岩和玄武岩。其储层主控因素包括岩性(岩相)、成岩作用、风化淋滤作用及断裂构造,其中断裂构造有利于裂缝发育和油气运聚;风化淋滤可以改善储层物性;岩性或岩相决定了火山岩的储集空间类型和后期演化;成岩作用中冷却收缩作用及溶解作用有利于提高储层物性。Zhongguai uplift of the northwestern margin in Junggar Basin was a nose paleo-uplift formed in compression stress field of the Carboniferous-Early Permian system.It was a favorable guiding zone for oil and gas migration and accumulation.There existed complex types of volcanic rocks,including volcanic lava,pyroclastic rocks and intrusive rocks in the operation area.Pyroclastic rocks mainly included tuff and volcanic breccia.Volcanic lava mainly included andesite and basalt.Intrusive rocks included granite and diabase.The volcanic reservoir space in the operation darea include secondary dissolution pores,cracks and a small number of primary porosity(intergranular holes,inter-gravel holes,residual porosity,etc).The reservoir was mainly characterized by low porosity-permeability(or ultra-low permeability) with strong heterogeneity.The dominant factors include lithology(facies),cracks,weathering and leaching and fracture.Physical property of the volcanic breccia and andesite are relatively better,followed by tuff and basalt.Fault structures are favorable for fracture development and hydrocarbon migration and accumulation,weathering and leaching can improve the reservoir property,lithology(lithic facies) determines the types of volcanic reservoir space and evolution.Cooling contraction and dissolution in diagenesis are beneficial to improve reservoir properties.

关 键 词：中拐凸起 火山岩 储层特征 主控因素 

分 类 号：P618.13[天文地球—矿床学]