准噶尔盆地石西地区侏罗系八道湾组储层特征及主控因素分析

摘要

The characteristics and controlling factors are dealt with for the reservoir rocks from the Jurassic Badaowan Formation in the Shixi region,Junggar Basin in the light of cores,well logs,cast thin sections and SEM techniques.The reservoir rocks in the Formation are primarily made up of feldspathic lithic sandstone and lithic sandstone.The reservoir spaces consist of primary intergranular pores,intergranular solution openings,intragranular solution openings and and microfractures,suggesting medium-to low-porosity and medium-to low-permeability reservoir rocks.The main controlling factors include the lithology,sedimentary facies,diagenesis and early hydrocarbon filling.The favourable reservoir rocks are considered to be developed in the braided delta front subaqueous distributary channel deposits in the first member (J1b1) and third member (J1b3) of the Jurassic Badaowan Formation.%通过岩心、录井、铸体薄片以及扫描电镜等分析手段,对准噶尔盆地石西地区侏罗系八道湾组储层进行分析,认为研究区储层以细粒沉积为主,岩石类型以长石岩屑砂岩、岩屑砂岩为主;储集空间主要由原生粒间孔、粒间溶孔、粒内溶孔和微裂缝组成,属于中低孔、中低渗储层.同时探讨了石西地区侏罗系八道湾组储层的主控因素,结果表明,岩性是优质储层形成的物质基础;沉积相是控制优质储层发育的主导因素;成岩作用和早期油气充注控制着储层孔隙的发育程度.研究区有利储层主要分布于八一段(J1b1)和八三段(J1b3)的辫状河扇三角洲前缘水下分流河道中.