Justification and prerequisites for the allocation of low-resistance reservoirs as a tool for searching for missed deposits on the example of the Surgut arch field

Abstract

The problem associated with low-resistance reservoirs in the fields of Western Siberia has been relevant since the end of the last century. According to the materials of geophysical well surveys (GIS), productive low-resistance reservoirs are often interpreted as water-saturated, as a result of which they are not used in the further operation of the well. The aim of the research is to illustrate the use of such parameters as statistical intensities of secondary changes in rocks (superimposed-epigenetic processes) as indicators of oil and gas saturation of low-resistance sand reservoirs at the unique field of the Surgut arch. The analysis is based on the method of statistical interpretation of the data of geophysical studies of wells developed by I. A. Melnik, who has achieved great success in studying this problem. Comparison of the results of these calculations with the results of processing the seismic data of the surface of the reflecting horizons confirmed the effectiveness of the proposed algorithm. The dependence of the intensity of secondary pyritization on tectonic disturbances and the distance to them was also determined. Recommendations for testing new intervals are given.