IMPROVEMENT OF THE METHODOLOGY FOR MODELING THE PERMEABILITY CUBE TAKING INTO ACCOUNT THE HETEROGENEITY OF THE STRUCTURE OF THE PORE SPACE OF THE PAY ZONES OF THE SOUTH TATAR ARCH

Abstract

This article analyzed the results of laboratory studies of the core of the terrigenous Devonian of one of the oil fields of the South Tatar Arch. It is shown that the studied productive deposits have a complex geological structure. Therefore, when constructing a three-dimensional geological-hydrodynamic model, it was proposed to use the FZI parameter and the coefficients of relative and volumetric clay content. Based on the FZI parameter, four conditional groups of reservoirs characterized by certain ranges of changes in geological properties were identified within the studied productive deposits. Further, for each conditional group of reservoirs, an independent correlation of permeability and porosity coefficients was built. To use the results of detailed geological structure, this article proposes a new methodology for modeling the permeability cube, taking into account the heterogeneity of the structure of the pore space and the distribution of relative shale. The results of the permeability cube according to the proposed method are compared with the results of the permeability cube according to the traditional method. This comparison showed that using the proposed new method, not only the distribution of the permeability coefficient within the studied volume was clarified, but also the average value increased from 253.6 to 421.9 mD. It has been shown that using a new method of modeling the permeability cube, there is a better convergence with the historical data on the development of the object under study. Based on the results of the adaptation of the 3D hydrodynamic model, a detailed analysis of the current state of development and development of reserves as of the date of study was carried out. It was noted that the use of this new method makes it possible to increase the reliability of the forecast and estimate of the distribution of residual mobile oil reserves in threedimensional geological and hydrodynamic modeling.