APPLICATION OF SEISMIC FACIES ANALYSIS FOR EVALUATING THE PROSPECTS OF COMPLEX CARBONATE RESERVOIR ON THE EXAMPLE OF OIL DEPOSIT (BY THE DATA OF WELL LOGS)

Abstract

The relevance of the research is determined by the need to minimize the uncertainties of geological interpretation using various classification algorithms in processing the entire complex of geological and geophysical data. The main aim of the research is the forecast and statistical justification of the distribution of facies based on geophysical information on the example of one of the deposits in Tomsk region. The object of the study is the Paleozoic sediments of the southeastern part of the West Siberian Plate – reservoirs of complex carbonate strata where terrigenous formations and carbonate varieties – limestone and dolomite – are encountered. Based on the conditions for constructing a seismic facies map, a study window was selected. It covers a rock volume of 40 m. Research methods are based on the application of classification algorithms to a seismic signal, which divide the object under study into regions that are homogeneous by a number of signs. In the classification algorithm along the seismic track geophysical studies of wells and laboratory studies of the core, which involves the integration of information, are very often included. A comprehensive interpretation of seismic and borehole data allows predicting at a qualitative level lithofacial variability in local areas, which contributes to a more rational placement of production wells. The lithotypes of productive strata rocks were identified and ranked based on comparison of the seismic parameter – acoustic impedance, according to borehole and seismic information. Data comparison was carried out using reconstructed density logging measurements.

Keywords

• seismic facies analysis
• seismic facies map
• facies
• well logging
• acoustic impedance
• paleozoic deposits