INFLUENCE OF OIL FIELD REEF CARBONATE RESERVOIR PETROPHYSICAL PARAMETERS OF TOURNASIAN-FAMENNIAN DEPOSITS IN UPPER KAMA ON WELL PRODUCTIVITY

Abstract

The relevance of the discussed issue is caused by the fact that the majority of carbonate deposits of the Upper Kama region oil deposits confined to reef structures belong to the fissure-pore type reservoirs. When exploring such complex objects, the productivity of the wells depends on the openness and permeability of fractures, their relative capacitance and mutual interrelation between fractures and matrix, on azimuthal spread of natural fractures in the area of the deposits. These parameters and factors are differently manifested in separate sections of the deposits in the course of their development and, in this relation, the issue of estimating and predicting the productivity coefficients of production wells in development of oil fields of the Upper Kama region is one of the topical and priority. The main aim of the study is to obtain empirical dependencies for operational prediction of natural fracturing parameters and productivity of producing wells on commercial data. Objects: Tourney–Famennian carbonate deposits of the Solikamsk depression fields of the Perm region. Methods. The work is based on literature materials and research of scientists in this field. Studies are based on actual field materials of geophysical, hydrodynamic studies conducted in the oil fields of the Upper Kama region; the data of laboratory studies of core material and rock sections. Results. The authors have determined the relative capacitive characteristics of the fractures, the coefficients of the flow between the fractures and the matrix, and the average fractures openness, as well as their dynamics with decreasing bottomhole and reservoir pressures during deposits exploration. A system of empirical relationships was developed and justified for estimating and predicting the average openness and relative fractures capacity, the coefficients of flow between the matrix and fractures, as well as the productivity of producing wells in developing oil deposits with carbonate reservoirs.

Keywords

• litho-facies zones
• carbonate reservoirs
• natural fractures
• fracture opening
• relative fracture capacity
• well productivity