Abstract: A new method for establishing identification models of the sedimentary microfacies is presented. The variogram was used to analyze the shapes of logging curves. The sedimentary significance of directional ranges was discussed. The variable in the direction of 0º reflects the stabilization extent of energy in sedimentary environments, and that in the direction of 90º reflects the fluctuation extent of hydrodynamics. The variables in the directions of 45º and 135º reflect the normal and abnormal rhythms, respectively. The radar figure of directional ranges is able to reflect the characteristics of logging curves and regularity of hydrodynamics. The numeric identification model developed by using directional ranges is excellent for sorting microfacies and easily adopted by many pattern recognition methods. This method can improve the efficiency and accuracy of microfacies identification.

Key words: variogram, sedimentary microfacies, sedimentary environment, automatic identification model, logging curve, radar figure of directional range

摘要： 提出了一种建立沉积微相测井识别模式的新方法,即利用变差函数对测井曲线的形态进行研究,并将不同方向上的变程作为定量刻画参数,来分析各个方向变程所蕴含的沉积学意义。0º方向的变程反映沉积环境的能量稳定程度;90º方向变程反映水动力动荡程度;45º和135º方向变程分别反映正韵律和反韵律特征。变程星形图可全面地刻画测井曲线的形态特征,反映沉积环境的水动力变化规律。以多方向变程为主要参数建立的定量识别模式,对微相分类明显,易于导入各类模式识别方法中,从而提高微相识别的效率和准确度。

关键词: 变差函数, 沉积微相, 沉积环境, 自动识别模式, 测井曲线, 变程星形图