Direct signs of oil-generation in the rocks of Bazhenov Suite

Nowadays, the term “organic petrology” is widely used for the microscopic study of the organic matter (OM) of rocks. In the world, there are a large number of articles describing organic macerals in regions where shale oil and gas are produced. It is no coincidence that the new term “organic petrolo...

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Bibliographic Details
Published in:	Georesursy Vol. 23; no. 2; pp. 152 - 157
Main Authors:	Pronina, Natalia V., Vaitekhovich, Anastasiya P.
Format:	Journal Article
Language:	English
Published:	Georesursy Ltd 01-04-2024
Subjects:	bituminite evaluation of maturity level indications of oil generation microscopic analyses organic petrology
Online Access:	Get full text
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Summary:	Nowadays, the term “organic petrology” is widely used for the microscopic study of the organic matter (OM) of rocks. In the world, there are a large number of articles describing organic macerals in regions where shale oil and gas are produced. It is no coincidence that the new term “organic petrology” appeared instead of “coal petrography” since new macerals were found and described in the dispersed organic matter. So, along with alginites (previously the only term describing the oil-source sapropel-type OM), bituminite and bitumen appeared. Bituminite is heterogeneous, so it has varieties as “post-mature bituminite” and “atypical bituminite”. One of the typical components of the Bazhenov formation, along with described above, are the remains of soft radiolarians bodies. All of these organic macerals have a similar reflectance index with small differences. Long-term studies of the OM rocks of the West Siberian basin have revealed indications of oil generation, which are easily established by standard microscopic studies. These indications include a change in the colour of macerals, a different glow of oil-source components (all from the liptinite group), the appearance of bitumen films, the appearance of post-mature bituminite, the appearance of secondary porosity.
ISSN:	1608-5043 1608-5078
DOI:	10.18599/grs.2021.2.15