利用视电阻率测井曲线形态特征定量判别沉积相

Sedimentary Facies Recognition Using Resistivity Logging Curves Quantitatively

测井曲线对地下岩石共生组合规律的响应一般是通过定性因素(即测井曲线特征)和定量因素(即测井参数值)反映出来的。本文以视电阻率测井曲线的幅度、形态、顶底接触关系、光滑程度、齿中线等要素为切入点,以沉积相学为基础,总结了各种沉积相视电阻率测井曲线的特征,并基于贝叶斯判别准则,建立了内蒙古二连盆地哈达图地区沉积相定量解释模型,预期达到用测井曲线来快速、准确地区分各种沉积相的目的。通过实例分析计算,发现其准确率达到90.91%。

The response of logging curves to the law of underground rock symbiotic assemblage is generally reflected by qualitative factors(i.e.logging curve characteristics)and quantitative factors(i.e.logging parameters).In this paper,based on the sedimentary facies,the characteristics of various apparent resistivity logging curves are summarized on the amplitude,shape,contact relationship between top and bottom,smoothness,midtooth line of and so on.Based on Bayesian discriminant criterion,a quantitative interpretation model of sedimentary facies in Hada map area of Erlian Basin,Inner Mongolia,is established,which is expected to achieve rapid logging curve and aiming for distinguishing various sedimentary facies accurately.Through the analysis and calculation of the examples,it is found that the accuracy of this method is as high as 90.91%.