Geoelectrical Models of the Achimov Formation Reservoirs at the Tevlinsko-Russkinskoye Field

Abstract

The article discusses the results of applying the methodology for assessing the oil saturation of the Achimov formation reservoirs based on the quantitative interpretation of electric logging data in vertical wells of the Tevlinsko-Russkinskoye field. Interpretation of electric logging data using traditional methods leads to errors in oil saturation estimation due to complex diagram shapes, which make it difficult to take readings in thin layers under the influence of resistivity-contrasting zones of penetration and enclosing layers. To calculate reservoir properties, approved petrophysical dependencies were applied, and the resistivity value of thin reservoirs was determined as a result of numerical joint inversion of data from a complex of galvanic and induction probes in the class of 2D geoelectric models, taking into account the design features of probes, well structure, radial and vertical distribution of electrophysical properties of rocks in the section. In 24 wells, geoelectric models were built and the oil content of the BS reservoirs was estimated.