测井资料沉积相分析在砂砾岩体中的应用

Application of Logging Data and Sedimentary Facies Analysis to the Glutenites

由于砂砾岩体沉积的特殊性,测井资料沉积相分析在砂砾岩体沉积相研究中起着十分重要的作用。FMI资料能够准确地识别砂砾岩体的沉积构造、岩石结构和沉积韵律性等特征,常规测井曲线则能够很好地区分各种类型的岩性。采用交会图分析技术和贝叶斯聚类分析方法,利用常规测井资料划分岩性的类型,由FMI资料描述各种岩相的岩石组合(成分、结构)、沉积构造、粒度和沉积韵律性等特征。针对水下冲积扇环境的砂砾岩体沉积,总结出15类岩相模式,并通过同岩心资料的对比分析,总结了各类微相的岩相特征,作为测井资料划分沉积相的依据。该方法己成功地应用于东营凹陷某区块的沉积相分析中。

In the subaquatic alluvial fan environment,the study of well-logging data was an important part.FMI(Formation Microresistivity Image)could identify accurately the sedimentary structure,rock texture and sedimentary rhythm and normal log curves were effective in different lithological types.Crossplots were used to extract the character value of all lithological types and then logfacies were determined by log curves using Bayes cluster algorithm.These information offered by FMI and normal log data could provide knowledge on lithofacies features such as rock combination(content and texture),sedimentary structure,rhythm and grain size.15 lithofacies in the subaquatic alluvial fan environment are summarized from log data.By comparison of core data with that of lithofacies,the mocrofacies features of subaquatic alluvial fan are summarized.These features are the bases of sedimentary facies analysis using log data.This method is used successfully for sedimentary facies analysis in the north of Dongying Sag.