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U/Сorg Ratio Within Unconventional Reservoirs: Indicator of Oil Generation Processes and Criteria for Productive Intervals Determination During the Bazhenov Formation InvestigationNormal access

Authors: 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
DOI: 10.3997/2214-4609.201900476
Organisations: EAGE
Language: Russian
Info: Extended abstract, PDF ( 609.47Kb )
Price: € 20

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.

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