ASSESSING REGIONAL AND LOCAL PETROLEUM POTENTIAL OF THE BAZHENOV AND ABALAK FORMATIONS IN WESTERN SIBERIA

M. Yu. Zubkov

In order to make a regional forecast of oil occurrence in the Bazhenov Formation rocks, the following criteria have been applied: formation thickness, organic matter content, formation temperature, thickness of underlying and overlying seals, apparent resistivity, and specific oil generation. Based on the study of epigenetic mineral complexes which often have clear crystalline faceting, it has been proven that tectonic-hydrothermal processes took part in the formation of secondary reservoirs in the Bazhenov and Abalak formations. Two principal types of rocks with siliceous and carbonaceous composition were identified as potential pay rocks, in which secondary reservoirs form. An original technique, which is based on integration of seismic data, and 2D and 3D tectonophysical modelling by optical polarisation and tectonic-sedimentation methods enabled local forecast of oil occurrence in the Bazhenov-Abalak play with identifying territories of different oil occurrence potential and allocation of project wells.

Key words: Bazhenov Formation, Abalak Formation, regional and local forecasts of oil occurrence, potential pay beds, secondary reservoirs, tectonic-hydrothermal processes, tectonophysical modelling.

DOI 10.20403/2078-0575-2016-3-51-67