| Summary: | Knowledge of the subject matter is obviously important to fill in the gaps between the information we have and information we want to have (or we wish at least). Assume a geological example where knowing that we are dealing with a sand bar or a meandering channel increase our ability to predict the location, geometry, and orientation of a petroleum reservoir. Such knowledge is largely qualitative rather than quantitative but notwithstanding they must be integrate in a geostatistical model. The paper deals with incorporation of the geological interpretation of a fault system into a three dimensional geostatistical model of geometry of the lignite seam b1 – Beladice. When the fault system is defined, the data must be considered with regard to all fault segments: data points located in the “shadow” of a fault segment, when seen from the target pont, cannot be selected during interpolation procedure as well as during calculation of the experimental variograms. In this way, the fault system divides a studied area into some smaller subareas. In presented paper, the single steps of the geostatistical case study are compared to the case ignoring the influence of the fault system on the final results.
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