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

N.V. Pronina, A.P. Vaitekhovich

Original article

DOI https://doi.org/10.18599/grs.2021.2.15

152-157
rus.

open access

Under a Creative Commons license
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.
 

organic petrology, microscopic analyses, indications of oil generation, bituminite, evaluation of maturity level

 

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Natalia V. Pronina
Lomonosov Moscow State University
1, Leninskie gory, Moscow, 119234, Russian Federation
e-mail: nvproncl@geol.msu.ru

A. P. Vaitekhovich
Lomonosov Moscow State University
1, Leninskie gory, Moscow, 119234, Russian Federation

 

For citation:

Pronina N.V., Vaitekhovich A.P. (2021). Direct signs of oil-generation in the rocks of Bazhenov Suite. Georesursy = Georesources, 23(2), pp. 152–157. DOI: https://doi.org/10.18599/grs.2021.2.15