U/Сorg Ratio Within Unconventional Reservoirs: Indicator of Oil Generation Processes and Criteria for Productive Intervals Determination During the Bazhenov Formation Investigation
N. Khaustova, Y. Tikhomirova, M. Spasennykh, Y. Popov, E. Kozlova and A. Voropaev
Event name: EAGE/SPE Workshop on Shale Science 2019
Session: Технологии разведки
Publication date: 08 April 2019
Info: Extended abstract, PDF ( 609.47Kb )
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Spectral gamma-ray logging is widely used and yields reliable data on uranium distribution within oil source rocks. The spectral gamma-ray logging is an important method for the detailed study of wells. Today this method is mainly used for oil-source formation identification and for organic matter calculation. The accumulation process of organic matter and depositional environmental influences on the uranium content. We performed complex analysis of U/Corg variations with sulfur isotope, geochemical survey, and well logging data. U/Corg ratio in different rocks and sweet spots were under research. Investigation results proved that sweet spots have the minimal meaning of the U/Corg ratio and that there is a statistically significant correlation between the U/Corg curves and the sulfur isotope vertical variations. The following data were involved: pyrolysis results (Rock-Eval), profile of total organic matter content obtained from thermophysical core profiling, well logging data, isotope composition, and also the results of the X-ray fluorescence analysis.