APPLICATION OF SEISMIC METHODS FOR ESTIMATING THE PERSPECTIVE OF OIL AND GAS POTENTIAL OF THE SEDIMENTS OF THE PALEOZOIC BASEMENT OF THE WESTERN SIBERIAN PLATE

Abstract

The relevance of the research is caused by the need to increase the raw potential of fields in Western Siberia, confined to pre-Jurassic deposits, with minimal additional exploration costs. This possibility is associated with the dramatic development of seismic survey technology in recent years. Modern 3D seismic survey allows tracing the characteristic features of the geological structure of the Paleozoic deposits, which were impossible to distinguish on 2D profile seismic sections. To obtain the most objective results, it is advisable to use a set of methods that include, in addition to seismic prospecting, methods of well logging. The main aim of the research is to identify promising areas for development of the pre-Jurassic complex according to seismic data on the example of one of the fields in Tomsk region, confined to the Paleozoic basement of Western Siberia. Objects of researches are deposits of the Paleozoic basement of the southeastern part of the West Siberian Plate, characterized by a complex material composition of rocks, a folded-block tectonic structure, the presence of natural fracturing of carbonate reservoirs, and porous-vuggy-fractured reservoir rock. Methods: seismic attribute analysis, seismic facies analysis, integration of seismic and results of well data interpretation. Results. The authors have carried out the analysis of spatial changes in seismic attributes, on the basis of which zones of increased fracturing were identified and the prevailing direction of fracture systems was assessed. The use of seismic facies analysis allowed identifying the confinement of areas of increased density of fractures to rocks with improved reservoir properties. The scheme developed for the oil and gas potential of the Paleozoic deposits on the example of one of the fields in Western Siberia is in satisfactory agreement with the results of geophysical well studies and data from a laboratory core study.

Keywords

• pre-jurassic basement
• paleozoic
• natural fracturing
• seismic fracture extraction methods
• seismic and well data integration