Methodological technique of knowledge integration for the geological study of Bazhenov organic-rich source rock formation of Western Siberia

UDK: 553.983.
DOI: 10.24887/0028-2448-2021-4-34-39
Key words: Bazhenov formation, Western Siberia, unconventional reservoir, knowledge integration, Jurassic organic-rich source rock formation
Authors: N.S. Balushkina (Lomonosov Moscow State University, RR, Moscow), V.V. Volianskaia (Rosneft Oil Company, RF, Moscow), S.V. Osipov (Rosneft Oil Company, RF, Moscow), O.V. Hotylev (National Intellectual Development Foundation, RF, Moscow), G.A. Kalmykov (Lomonosov Moscow State University, RR, Moscow)

Bazhenov formation is one of the most discussable subject of geological studies in the Western Siberia basin. However, recent high-tech core analysis and new methodological technique of knowledge integration allowed to distinguish this Jurassic organic-rich source-rock formation as a new stratigraphic-geochemical unit. This type of sours rocks has 2 basic features: organic matter content less then 2.5% and only marine environment of deposition. The main idea of such classification is the attempt to determine source rock by reservoir type. The organic-rich source rock is triadic. It is mother rock, reservoir rock and seal in the same time and is independent of lithology. The Jurassic organic-rich source-rock formation in the Western Siberia can be classified as a regional reservoir also.

The article describes the methods and techniques for the geological investigation and algorithm of knowledge integration based on the studies of the Western Siberia Jurassic organic-rich source rock. The initial element of the study of the Bazhenov formation is well section. The complex of geochemical, lithological and petrophysical laboratory studies is applied equally to the productive and non-productive intervals of the section. Well sections of The Bazhenov formations are stratified and correlated based on lithology, paleontology, and well logging data. The paleogeomorphological profiles describe the lateral and vertical variability of the Bazhenov layers in valleys, on arches and slopes of paleostructures. The area of distribution of siliceous, phosphate, and carbonate reservoirs is controlled by the sedimentation conditions of each of them, as well as by the degree of maturity, which determines the formation of secondary pores, caverns and cracks. At the low stage of catagenesis siliceous, phosphate, and carbonate layers have low reservoir properties, at the late stages of catagenesis all layers transformed to good reservoirs. 

The proposed algorithm of knowledge integration can be applied to other organic-rich source-rock formations with low thickness, complex lithofacies zoning and pore space structure.


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