【摘要】 乌尔禾油田中二叠统下乌尔禾组局部发育一套特殊的凝灰质碎屑岩,岩石类型包括火山灰凝灰岩、沉凝灰岩以及凝灰质砂砾岩,其电测曲线呈现高电阻率、低声波时差的特征。根据对岩心、铸体薄片、测井和地震资料综合分析,认为凝灰质碎屑岩为封闭-半封闭的咸化碱性湖湾环境下火山灰与正常碎屑物混合堆积而成,储集层具有双重孔隙介质特征。更多还原

【Abstract】 A set of special tuffaceous rocks compose of ash tuff,bedded tuff and tuffaceous glutenite is partly developed in the Lower Wuerhe formation of Middle Permian in Wuerhe oil field and characterized by high resistivity and low interval transit time on the electriclog curves. Based on the analysis of core,cast thin section,logging and seismic data,it is considered that the tuffaceous clastic rocks are in closed to semi-closed arm of lake environment that is saline and alkaline and shaped by ash-clastic mixed accumulation. Such a reservoir is of feature of dual porosity media.更多还原