Paleogeographic Criteria for Prediction of Oil and Gas Potential of Jurassic Sediments of Western Siberia

Based on extensive material paleogeographic reconstructions of Jurassic sediments were carried out, sedimentation conditions were determined and oil and gas potential within the West Siberian oil and gas basin was assessed. Paleogeographic maps compiled for the Lower Jurassic (late Toarcian), the Middle Jurassic (Bajocian, Bathonian, Callovian) and the Upper Jurassic (Oxfordian, Kimmeridgian) productive complexes. Sedimentation criteria for the distribution of reservoir rocks are revealed, zones of development of improved reservoirs associated with channel and delta complexes are determined. New studies allowed to significantly clarify and detail the overall picture of paleogeographic development and identify the stages of formation of the Jurassic sedimentation basin for the entire territory of Western Siberia. On the basis of paleogeographic reconstructions, the forecast zones of formation of reservoir rocks are determined and the resource potential of Jurassic deposits within the unallocated subsoil fund is estimated.