Key words: geological model, facies, integrated approach, risks evaluation, decision trees, oil fields development.
The article considers the experience of application conceptual geological models in Gazprom Neft JSC. Gazprom Neft pays great attention to developing integrated fields development plans, including the study of the geological basis. Under low quantity of data seismogeological and facies models has a big importance. An integrated approach to the understanding of modern geological deposits on the basis of the history of its formation, ways of hydrocarbons migrations is an important phase in the life of the oil and gas project.