Pluri-Gaussian Simulation is now widely used for simulating facies properties. One of its advantages is to be able to reproduce transitions between lithotypes in the geological domain by the mean of a truncation diagram or lithotype rule. However, simulating in a context of non-stationary lithotypes proportions remains difficult because most implementations lack a coherent and automatic algorithm to modify the truncation diagram so that it matches the local proportions. The proposed method aims at proposing a solution to this limitation. An adapted version of the CART algorithm is used to build the truncation diagram from (measured) geological properties. This method allows to design potentially complex truncation diagrams. The same algorithm is also used during the simulations to automatically adapt the truncation diagram to the local proportions. The algorithm is shown to be very efficient and to deliver simulation results that are ensuring the reproduction of the proportion trend maps while producing lithotype maps that coherent with respect to the expected contacts.


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