Alginite-Rich Layers in the Bazhenov Deposits of Western Siberia

Geosciences

Elena Kozlova¹  Evgeniya Leushina¹  Mikhail Spasennykh¹  Timur Bulatov¹  Natalia Pronina²  Nikita Morozov³  Andrey Voropaev⁴  Ivan Panchenko⁵ 

[1] Center for Hydrocarbon Recovery, Skolkovo Institute of Science and Technology (Skoltech), Skolkovo Innovation Center, Bolshoi Boulevard 30, Bld. 1, 121205 Moscow, Russia;Faculty of Geology, Lomonosov Moscow State University, GSP-1, Leninskie Gory, 119991 Moscow, Russia;Gazprom Neft Science & Technology Centre, Moika River emb. 75-79 liter D, 190000 Saint Petersburg, Russia;HYDROISOTOP GmbH, Woelkestr. 9, 85301 Schweitenkirchen, Germany;MiMGO, Entuziastov Highway 21, 111123 Moscow, Russia;

关键词: the Bazhenov Formation;    alginite-rich layers;    macerals;    type I kerogen;    algal organic matter;    marker horizon;   

DOI  :  10.3390/geosciences11060252

来源: DOAJ

【 摘 要 】

In this study, we identified the luminescent layers containing a significant amount of alginite in the Upper Jurassic–Lower Cretaceous Bazhenov Formation named “the alginite-rich layers”. Lithological and geochemical methods were used to determine distinctive features of these layers and to evaluate their impact on the total petroleum generation potential of the Bazhenov Formation. We have shown that the composition of the alginite-rich layers differs significantly from the organic-rich siliceous Bazhenov rocks. Rock-Eval pyrolysis, bulk kinetics of thermal decomposition, elemental analysis, and the composition of pyrolysis products indicate type I kerogen to be the predominant component of the organic matter (OM). Isotope composition of carbon, nitrogen, and sulfur was used to provide insights into their origin and formation pathways. The luminescent alginite-rich layers proved to be good regional stratigraphic markers of the Bazhenov Formation due to widespread distribution over the central part of Western Siberia. They can also be applied for maturity evaluation of the deposits from immature to middle of the oil window, since the luminescence of the layers changes the color and intensity during maturation.

【 授权许可】

Unknown