Modelling of the geological processes is a computational technique that creates stratigraphic models that show the expected sediment geometry and predict the distribution of lithologies and depositional environments. The method helps to reproduce the evolution of sedimentary systems over geological time, hence, in addition to borehole and seismic data, an analysis of the history of geological development is necessary. Such data are: sea level variation, climatic and paleogeographic conditions, descriptions of the process of substance transport, rates of transport and deposition of terrigenous material, sources of drift. During the modeling process, it is necessary to have a clear understanding of the final result and to tune the input parameters in detail, which causes the calculation of many iterations to agree with the conceptual model. The results allow evaluation of various options and enable prediction of the distribution of prospective oil and gas reservoirs in areas where no wells are drilled.  Modeling of floor fans was carried out for the Achimov formation of the West Siberian field. As a result, a sedimentation model was obtained, which reflects the formation of elements of the sedimentation system of the studied area.

Keywords: Geological process modelling, Achimov formation, floor fans, seismofacial analysis

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