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Distribution Patterns of Main Structural-Group Parameters of Crude Oils from the North Caucasus Oil-and-Gas Basin According to 13C NMR Data
https://orcid.org/https://orcid.org/0000-0003-1621-5324
https://orcid.org/https://orcid.org/0000-0002-7588-829X
Using 13C NMR examination, a representative set of crude oils (86 samples, 54 oil fields and exploration areas) from the North Caucasus oil-and-gas basin (OGB) was investigated. The distribution of carbon among major structural moieties in crude oil molecules was characterized for the first time over the entire basin. Based on relevant distribution density plots, bimodal and polymodal distributions were demonstrated for all the composition parameters measured, except Σn-Alk/C4n(1). However, even the unimodal distribution of this parameter deviated from normal. Using non-parametric statistical analysis, the North Caucasus oils were found to have markedly lower aromaticity than the Western Siberia and Volga–Urals oils. On the other hand, the North Caucasus oils showed a higher content of n-alkyls than the three OGBs previously explored, including the Eastern Siberia basin. The study confirmed the previous 1H NMR-based classification of the North Caucasus oils. According to this classification, the crude oils of this basin can be divided into three major stratigraphic groups in terms of oil composition: the oils from Triassic and Jurassic reservoirs; the oils from Cretaceous sediments; and the oils from Paleogenic and Neogenic deposits. Finally, a difference in the origin of the North Caucasus crude oils was identified between the tectonic structures adjacent to the Greater Caucasus Mountain Range (including the Indolo-Kuban Foredeep as well as the Sunzhensk and Tersk anticlinal zones of the Tersk-Caspian Foredeep) and the North-Eastern part adjacent to the Caspian Sea (including the Eastern Karpinsk Ridge and the Kuma uplift zone). The first group of oils is predominantly of marine origin with significant terrigenous admixtures, whereas the second group is of terrigenous origin. This finding dramatically changes the existing understanding of the origin of the Ciscaucasian crude oils.
Distribution Patterns of Main Structural-Group Parameters of Crude Oils from the North Caucasus Oil-and-Gas Basin According to 13C NMR Data
https://orcid.org/https://orcid.org/0000-0003-1621-5324
https://orcid.org/https://orcid.org/0000-0002-7588-829X
Using 13C NMR examination, a representative set of crude oils (86 samples, 54 oil fields and exploration areas) from the North Caucasus oil-and-gas basin (OGB) was investigated. The distribution of carbon among major structural moieties in crude oil molecules was characterized for the first time over the entire basin. Based on relevant distribution density plots, bimodal and polymodal distributions were demonstrated for all the composition parameters measured, except Σn-Alk/C4n(1). However, even the unimodal distribution of this parameter deviated from normal. Using non-parametric statistical analysis, the North Caucasus oils were found to have markedly lower aromaticity than the Western Siberia and Volga–Urals oils. On the other hand, the North Caucasus oils showed a higher content of n-alkyls than the three OGBs previously explored, including the Eastern Siberia basin. The study confirmed the previous 1H NMR-based classification of the North Caucasus oils. According to this classification, the crude oils of this basin can be divided into three major stratigraphic groups in terms of oil composition: the oils from Triassic and Jurassic reservoirs; the oils from Cretaceous sediments; and the oils from Paleogenic and Neogenic deposits. Finally, a difference in the origin of the North Caucasus crude oils was identified between the tectonic structures adjacent to the Greater Caucasus Mountain Range (including the Indolo-Kuban Foredeep as well as the Sunzhensk and Tersk anticlinal zones of the Tersk-Caspian Foredeep) and the North-Eastern part adjacent to the Caspian Sea (including the Eastern Karpinsk Ridge and the Kuma uplift zone). The first group of oils is predominantly of marine origin with significant terrigenous admixtures, whereas the second group is of terrigenous origin. This finding dramatically changes the existing understanding of the origin of the Ciscaucasian crude oils.
Distribution Patterns of Main Structural-Group Parameters of Crude Oils from the North Caucasus Oil-and-Gas Basin According to 13C NMR Data
https://orcid.org/https://orcid.org/0000-0003-1621-5324
https://orcid.org/https://orcid.org/0000-0002-7588-829X
Using 13C NMR examination, a representative set of crude oils (86 samples, 54 oil fields and exploration areas) from the North Caucasus oil-and-gas basin (OGB) was investigated. The distribution of carbon among major structural moieties in crude oil molecules was characterized for the first time over the entire basin. Based on relevant distribution density plots, bimodal and polymodal distributions were demonstrated for all the composition parameters measured, except Σn-Alk/C4n(1). However, even the unimodal distribution of this parameter deviated from normal. Using non-parametric statistical analysis, the North Caucasus oils were found to have markedly lower aromaticity than the Western Siberia and Volga–Urals oils. On the other hand, the North Caucasus oils showed a higher content of n-alkyls than the three OGBs previously explored, including the Eastern Siberia basin. The study confirmed the previous 1H NMR-based classification of the North Caucasus oils. According to this classification, the crude oils of this basin can be divided into three major stratigraphic groups in terms of oil composition: the oils from Triassic and Jurassic reservoirs; the oils from Cretaceous sediments; and the oils from Paleogenic and Neogenic deposits. Finally, a difference in the origin of the North Caucasus crude oils was identified between the tectonic structures adjacent to the Greater Caucasus Mountain Range (including the Indolo-Kuban Foredeep as well as the Sunzhensk and Tersk anticlinal zones of the Tersk-Caspian Foredeep) and the North-Eastern part adjacent to the Caspian Sea (including the Eastern Karpinsk Ridge and the Kuma uplift zone). The first group of oils is predominantly of marine origin with significant terrigenous admixtures, whereas the second group is of terrigenous origin. This finding dramatically changes the existing understanding of the origin of the Ciscaucasian crude oils.
Distribution Patterns of Main Structural-Group Parameters of Crude Oils from the North Caucasus Oil-and-Gas Basin According to 13C NMR Data
Pet. Chem.
Smirnov, M. B. (author) / Vanyukova, N. A. (author)
Petroleum Chemistry ; 63 ; 74-81
2023-01-01
8 pages
Article (Journal)
Electronic Resource
English
| Springer Verlag | 2022