地球化学元素方程的建立及对沉积环境的指示

Establishment of the Prediction Equations for Geochemical Elements and Its Instructions for Sedimentary Environment

为了使测井资料在沉积环境研究中得到更广泛的应用,利用不同种类的测井曲线对岩石中元素的地球化学响应特性在元素和测井数据之间建立起多元回归预测方程,并用于分析元素在不同地质剖面的富集规律及沉积环境。本文以东营凹陷牛38井和郝科1井为研究对象,根据元素数据和测井数据,通过多元回归分析,建立了元素Na、Ca、Sr、V、Zn、Ni的计算模型,并将此模型用于分析东营凹陷博14井的沙三下-沙四上段的元素含量及其在地质剖面中的富集规律,结果表明元素的富集与剖面中的相变具有较高的耦合性,能够很好地指示沉积环境的变化。

In order to extend the application of log data in the study of sedimentary environment,we establish predictive e- quations of the log response and elemental compositions of sedimentary rocks in different sedimentary facies.The equations have been used to analyze the enrichment of elements and the sedimentary environment of different geological section. Taken well niu38and well haokel in the Dongying sag as example,the predictive model based on logging data and elements including Na,Ca,Sr,V,Zn,Ni was established by multiple repression analysis.This model was used to address the enrichment of elements in sections from lower subsection of the Third Member 3of the Shahejie Formation to upper subsection of the Forth Member of the Shahejie Formation in the Well bo14.The results show that the enrichment of elements is coulpled with changing of sedimentary phases,which can be used to indicate the sedimentary environment.