A comprehensive analysis of the properties of reservoir rocks to determine the productive oil horizons

Abstract

The purpose of the research is to study the reservoir and filtration properties of reservoir rocks of the Aptian horizon of formation No. 1 within the Kovylnoye field. The initial data were reservoir-filtration and geological-geophysical parameters within the exposed rocks of the reservoirs of the Aptian horizon of formation No. 1, for wells No. 1 and No. 2, which were drilled at the search and evaluation stage of work: porosity coefficient, permeability coefficient, rock resistivity, oil-saturated thickness. High values of effective porosity, permeability, and oil and gas saturation are found in biomorphic, organogenic, and clastic carbonate rocks where the void space has not been subjected to secondary changes (salt deposits), resulting in reservoirs characterized by low capacitance and filtration properties. Analysis of carbonate reservoirs gives values of permeability up to 0.3-1 mm2 and porosity of 20-35 %. Rocks are lumpy, loose, weakly cemented with cement content up to 10%. Their initial water saturation in the oil deposit does not exceed 5-20 %. The research has shown the effectiveness of conducting a comprehensive analysis of reservoir rock properties to determine the oil and gas content of the site.