The Analysis of the Variograms of Geological Models and Bodies of Various Configurations

The work is divided into three parts. In first part it is considered accuracy of interpolation of collectors with SIS method with various values of ranges and NTG. The worst collector prediction is estimated when the NTG value is about 0.5, but at this value of NTG the error of net volume estimation is minimum.

In second part it is considered experimental variogramms which are obtained on geobodies of spherical and cubical shape and channel-like bodies. Cube and sphere size can be estimated from variogramm range, but at low value size can be overestimated due to clusterization of bodies. Channel wavelength can be estimated from hole range of variogramms and variogramm map shows direction of wave axis by the variogramm minima axis.

In third part real geomodels are examined. More than 150 models of various parts of Russia and various geological ages are taken. The relations between variogramm range, porosity, permeability, NTG, sedimentological facies etc. are analyzed. The relations between vertical and horizontal range and permeability were estimated. It is confirm two points. First, better homogeneity in vertical direction leads to better homogeneity in horizontal direction.