准噶尔盆地阜东斜坡区头屯河组低电阻率成因分析  

Origin Analysis on Low-resistivity Reservoirs of Toutunhe Formation in Fudong Slope Zone,Junggar Basin

作　　者：史安平 申辉林 秦敏 刘欢 黄信雄 SHI Anping;SHEN Huilin;QIN Min;LIU Huan;HUANG Xinxiong(School of Geosciences,China University of Petroleum,Qingdao,Shandong 266580,China)

机构地区：[1]中国石油大学地球科学与技术学院,山东青岛266580

出　　处：《测井技术》2018年第5期509-513,共5页Well Logging Technology

摘　　要：头屯河组是准噶尔盆地阜东斜坡带的重要勘探层系,储层岩性以细粒岩屑砂岩为主,储集空间主要为原生孔隙,中孔隙度、中低渗透率及岩石强亲水性的特性,导致储层常常在测井曲线上表现为低电阻率特征。以薄片、扫描电镜观察、X-衍射矿物析、压汞实验析、地层水矿化度分析及岩心常规分析为手段,从储层微观孔隙结构、束缚水饱和度、黏土含量及类型、地层水矿化度变化、含油饱和度特征及钻井液侵入等方面,对研究区头屯河组低电阻率成因及机理进行了分析。结果表明,以伊蒙混层为主要类型的黏土矿物附加导电、局部储层高地层水矿化度、弱成藏动力下的低含油气充满度及长时间的盐水泥浆侵入是造成研究区储层表现为低电阻率的主要原因。The Toutunhe Formation is an important exploration layer in the Fudong slope zone of the Junggar Basin.The characteristics of the reservoir are as follows:the lithology is dominated by fine-grained lithic sandstone,the reservoir space is mainly primary pores with medium and medium-low permeability,and the rock is strongly hydrophilic.These characteristics result in reservoirs exhibiting a low resistivity response on the well logging.In order to understand the cause and mechanism of low resistivity reservoirs in the study area,this paper studied the microscopic pore structure,irreducible water saturation,clay content and type,formation water salinity change,oil saturation and mud invasion based on the data such as thin section observation,scanning electron microscopy,X-ray diffraction analysis,mercury injection experiment analysis,formation water salinity analysis,and routine analysis of cores.The results show that the reasons for reservoirs with low resistivity in the study area are as follows:the clay types in the study area are mainly illite/smectite,which have additional conductivity;some reservoirs has high formation water salinity;under the condition of weak hydrocarbon accumulation,the filling degree of oil and gas is low;and the time of brine mud invasion is long.

关 键 词：测井评价 低电阻率油层 黏土附加导电 地层水矿化度 盐水泥浆 低含油饱和度 

分 类 号：P631.84[天文地球—地质矿产勘探]