DETERMINATION OF OIL SATURATION COEFFICIENT WHEN ASSESSING THE GEOLOGICAL OIL RESERVES OF THE MAASTRICHTIAN DEPOSITS OF THE UPPER CRETACEOUS SEDIMENTS OF THE EASTERN CISCAUCASIA

Abstract

Introduction. The article considers the problem of determining the oil saturation coefficient of the upper Cretaceous deposits of the Eastern Caucasus, and suggests the use of a method to increase the reliability of its determination. The study area in the regional tectonic plan covers the Prikum uplift system, the Nogai stage, and the Northern part of the Tersk-Caspian forward trough. In terms of oil - Prikumsk petroleum and Terek-Sunzha oil and gas areas. Materials and methods of the research. The paper uses data obtained by GIS methods, the results of laboratory studies of the core of upper Cretaceous deposits of the Eastern Caucasus, to solve the problem, the method of mathematical statistics is used, based on historical data of the development of deposits in this region. The results of the research and their discussion. The efficiency used to determine the saturation GIS techniques, the studied petrophysical features, reducing the accuracy of determining the coefficient of saturation of hydrocarbons (HC) Maastricht deposits. An algorithm for determining the oil saturation coefficient using the Buckley-Leverett function based on historical development data is presented on the example of several fields. Conclusions. To improve the accuracy of determining the oil saturation coefficien, a complex application of methods, both traditional (GIS) and new, including the presented method of mathematical statistics, is proposed.