关键词: 数字地层, Kriging插值, 变异函数, 变异函数模型

Abstract: Spatial interpolation methods reflect the accuracy and precision of spatial variability and relationships that influence the validity of 3D geological model.The variogram model and parameters have greater influence to ordinary Kriging.By using cross-validation and error analysis，the performance of Kriging used in digital stratum is described by a set of parameters such as extreme value，variance，correlation coefficient，average error and error distribution.The differences of spherical model，exponential model and linear model are studied.The results show that the blocked index model is the best.

Key words: digital stratum, Kriging interpolation, variogram, variogram model