Hi Sami22

Depent of your data. For exemple if you have thikness, netsand, top, botton, average of porosity, or permeability of the resevoir the variogram have to compute in 2D, the data is X,Y and the value of properties (thikness, netsand, others). Now if you have porosity, permeability in a geological unit you have compute the 3D variogram. You data have X, Y at the location well, Z each 1 meter or feet