铁边城地区深层低电阻率油层成因及测井识别技术  

Genesis Analysis and Logging Recognition Methods of Deep Low-resistivity Reservoir in Tiebiancheng Area

作　　者：张晓明[1] 王晓红[1] 郑秀臣[1] 赵振兴[1] 殷国瑞[1] 

机构地区：[1]长庆油田分公司第八采油厂,陕西西安710021

出　　处：《测井技术》2010年第4期360-364,共5页Well Logging Technology

基　　金：长庆油田分公司科研项目;吴定地区长6油藏油气富集规律及勘探评价综合研究(长中科委[2008]2号)

摘　　要：铁边城地区深层为三角洲前缘相沉积体系,储层物性差,油层测井响应一般为高电阻率特征,深层油层电阻率偏低,与水层对比度差,往往被误判。深层低电阻率油层的成因受高束缚水饱和度、地层水矿化度和薄互层的影响。铁边城地区深层长6油层为高束缚水饱和度、高黏土附加电导性的岩性低电阻率油层。利用四性参数限值法、组合熵(H值)法、微分分析法、视自然电位差法、横向对比法等综合测井识别技术,有效解决了铁边城地区深层低电阻率、低对比度油层识别难的问题。识别低电阻率油层时,要综合利用各种识别方法,特别重视分析相近物性和相似岩性条件下储层间的电性差异,分析相近电性条件下储层间的岩性或水性差异,分析非电阻率信息差异。Deep reservoir of Tiebiancheng area is a delta front facies system with poor reservoir properties and generally high impedance characteristics. Due to the low resistivity and poor water layer contrasts, deep low-resistivity pay zones are often missed. Analyzed are the influence of high bound water saturation, formation water salinity and thin interbed on the genesis of deep low-resistivity reservoir in this area. Chang6 layer of Tiebiancheng area is a lithologic low-resis- tivity reservoir with high bound water saturation and high attached electrical conductivity of clay. Through the four of arguments limit law, the combined entropy （H value） method, the differen- tial analysis, the spontaneous potential difference method, lateral contrast and other comprehensive logging recognition technology, resolved are the Tiebiancheng deep low-resistivity and low- contrast reservoir identification problem. Different methods should be used together to identify low-resistivity reservoir, especially pay more attention to analyzing formation electrical property differences when the physical properties and lithological characters are similar; to analyzing lithological or aquosity differences when the electrical properties are similar; to analyzing other non-resistivity differences.

关 键 词：测井解释 深层低电阻率油层 束缚水饱和度 岩性识别 铁边城地区 

分 类 号：P631.84[天文地球—地质矿产勘探]