Seismic Criteria for Predicting Reservoir Quality and Delineating Complex Traps in the West Siberian Petroleum Province

Abstract

Based on the integrated seismic, well logging and deep drilling data, the present work considers the procedures used for detecting and mapping a number of complex exploration targets in Callovian-Volgean sequences of the West Siberian petroleum province. Of prime interest in terms of its petroleum potential within the study area are transgressive Oxfordian sand beds (J11-2) that occur at the top of the Vasyugan formation and beneath the Bazhenov one, the major oil-generating stratum in West Siberia. The J11-2 sands exhibit differing lithology and facies changes with associated hydrocarbon pools having both structural and lithological limitations. The whole body of geological and geophysical knowledge, an integrated approach to seismic, deep drilling and log data interpretation with the use of the wave field mathematical modeling allowed us to develop seismic criteria for predicting and assessing the Oxfordian net sands and delineate complex exploration targets. The proposed prediction criteria based on the analysis of wave field amplitude attributes and paleostructural reconstructions were proved to be highly effective for a number of targets located in the central and southern regions of the West Siberian petroleum basin.