The method of multivariate geological modeling and wells correlation of pashiysky horizon

This article describes the method of multivariate calculation of geological uncertainties and the first stage of the geological model construction - well correlation of the pashiysky horizon of Novosergievsky and Perevolotsky districts of the Orenburg region in the domestic tNavigator software product of RockFlowDynamics. This technique allows to construct geological models of the pashiysky horizon on variants P10 (optimistic), P50 (realistic), P90 (pessimistic), thereby to estimate risks and to carry out quality control of geological model. This method is used to construct structural maps of the roof and bottom of the pashiysky horizon. In the fields of the territory of Novosergievsky and Perevolotsky districts, the pashiysky horizon is a secondary potential object of development with a rather complex geological structure. The interest to the object is caused by single wells producing oil from the pashiysky horizon, which indicates the confirmed oil and gas potential of the reservoir in the studied area. The industrial oil-bearing capacity of the area is associated with deposits of the pashiysky horizon, the Kolgan strata and the Tournai tier. The peculiarity of the correlation of the pashiysky horizon was the inhomogeneous structure, which often causes difficulties when comparing well-logs curves. The pashiysky horizon is composed of fine - and fine-grained siltstone sandstones, with thin layers of siltstone and mudstone. The deposits of the pashiysky horizon were formed in the conditions of the sea coast with mixed wave and river activity.