Organic Matter of Bazhenov Formation: Chemical and Isotope Composition, Microstructure, Thermal Maturation, Generation Potential and the Effect on Rock Properties

The Bazhenov shale Formation is one of the largest source rock formation in the world. In this research the chemical and isotope compositions, the microstructure and other parameters of organic matter of the Bazhenov Formation from the Central, East, West and North parts of Western Siberia have been studied. A wide spectrum of analytical methods has been applied, including Rock-Eval pyrolysis, kinetics of kerogen thermal decomposition, electron-ion microscopy, X-ray micro-tomography, gas chromatography–mass spectrometry, solid state NMR and X-ray photoelectron spectroscopy, isotope measurements and other. It was shown that geochemical parameters of the organic matter of Bazhenov Formation, including kerogen, oil and gas chemical and isotope compositions, microstructure of kerogen and other considerably vary for different oilfields of Western Siberia depending on thermal maturity and other geological and lithological factors. Correlations between geochemical characteristics and petrophysical properties of rocks, including density, fluid saturation, geomechanical, thermal and other properties have been studied. Obtained results provide good opportunities for the development of advanced methods for shale reservoir characterization basing on logging and core analysis data