Upper Jurassic oil shale of the Volga basin: lithotypes, formation models and producibility
DOI:
https://doi.org/10.17308/geology.2021.1/3335Keywords:
oil shale, Volga basin, producibility, Kotsebinskoe field, anoxic conditions, volcanismAbstract
Introduction: The producibility of oil shale from the Kotsebinskoe and Perelyubskoe fields varies greatly, both vertically and laterally. This article is devoted to the study of the influence of the variability of formation conditions on the producibility of oil shale in the Volga basin. Methodology: In this study, the following methods were used: macro description of core, lithologic and petrographic study of cross-sections, and the study of electron microscopic images. When analysing the conditions for oil shale formation, we used the material obtained during the prospecting and appraisal activities and exploration at the Kotsebinskoe and Perelyubskoe fields. Results and discussion: Based on the study of the main lithotypes of oil shale of the Kotsebinskoe and Perelyubskoe fields, we determined the processes influencing the producibility of oil shale, such as the volume of terrigenous material inflow, the bioproduction of the paleobasin, and the degree of fossilization of organic matter (OM). Conclusions: It was determined that the low producibility of oil shale is due to a high intensity of the terrigenous material inflow from the migration area, and a low degree of OM fossilisation. In return, the increase in the producibility of oil shale is associated with a low inflow of terrigenous material and a high degree of OM fossilisation. For two lithotypes, the high bioproduction of the paleobasin is also supposed. The obtained data allowed us to build and study the probable “idealised” models of oil shale formation. In the future, these data can be used to remodel the conditions for the formation of each productive layer of oil shale.
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