Modern approaches to the justification of zones with different saturation

Abstract

   Most of the deposits that that have been developed in Western Siberia over the past 10 to 15 years are characterized by a complex and highly complex structure with small sizes. The effective development of such deposits is possible only on the basis of adequate and sufficiently accurate models. The construction of detailed and high-precision models of complex deposits is impossible without a comprehensive analysis of all types of geological and geophysical information, and in some cases, the physical and chemical properties of reservoir fluids.   The aim of the study is to clarify the geological structure of the PK19 2 formation of the Beregovoye field through a comprehensive analysis.   The use of an expanded well logging, predictive maps of effective thicknesses and sandiness according to seismic data and the justification of an increased set of regional and local benchmarks made it possible to clarify the area of hydrocarbon distribution and show that the deposit is not a single one, but consists of three hydrodynamically separated deposits. The lithological differentiation of the deposits is indirectly confirmed by a significant difference in fluid contacts. The discrepancy between the contacts of the northern and southern deposits is 6 m. An analysis of the physico-chemical properties of reservoir fluids has shown that the northern and southern deposits are saturated with condensates of different types and significantly different densities. The results of the work have enabled the following conclusions to be drawn: firstly, the structure of the PK19 2 formation deposits of the Beregovoye field has been clarified and detailed; secondly, the reserves have been clarified; and thirdly, it has been demonstrated that the condensate density of the northern deposit is such that setting condensate reserves on the state balance and their extraction from this deposit are economically impractical.