A main problem faced in the development of a hydrocarbon reservoir is that of constructing a reservoir model that can generate reliable production forecasts under various development scenarios. After a few appraisal wells have been drilled, or after a few years of production, the reservoir specialists have to provide a model of the inter-well geological architecture. In the presented paper the last results of geostatistical reservoir modelling, prepared at the Regional Centre of the Geological Bureau Geonafta in Piła, are demonstrated.