TY - JOUR

T1 - О «палеозойских корнях» нефтей Восточного Предкавказья

T2 - About “Paleozoic roots” of the oils of the Eastern Ciscaucasia

AU - Yandarbiev, Nurdin Sh

AU - Sachsenhofer, Reinhard F.

AU - Stepanov, Andrey N.

AU - Yandarbieva, Diana N.

N1 - Publisher Copyright: © 2022, Georesursy LLC. All rights reserved.

PY - 2022/5/16

Y1 - 2022/5/16

N2 - The paper considers geochemical data on the biomarker composition of oils from the fields of the Terek-Caspian oil and gas basin. Samples of oils from the fields of the main oil and gas bearing regions of the Eastern Ciscaucasia – Terek-Sunzha zone, Prikumsky swell, Piedmont Dagestan and the Middle Caspian Sea were studied. To determine the “geochemical” age of oils, the ratios of regular steranes in saturated oil fractions were analyzed. It was found that the value of the biomarker parameter St28/St29, which determines the geological age of the original organic matter for oils, varies widely – 0.36–1.47. The most “ancient” age (Devonian-Carboniferous) was determined for the oils of the Prikumsky swell and the water area of the Middle Caspian; in the Terek-Sunzha zone and Piedmont Dagestan, an increase in the proportion of St28 sterane is recorded in oils, which indicates a younger generation age (up to the Paleogene). The data obtained can be used to clarify the history of the formation of hydrocarbon accumulations in this region.

AB - The paper considers geochemical data on the biomarker composition of oils from the fields of the Terek-Caspian oil and gas basin. Samples of oils from the fields of the main oil and gas bearing regions of the Eastern Ciscaucasia – Terek-Sunzha zone, Prikumsky swell, Piedmont Dagestan and the Middle Caspian Sea were studied. To determine the “geochemical” age of oils, the ratios of regular steranes in saturated oil fractions were analyzed. It was found that the value of the biomarker parameter St28/St29, which determines the geological age of the original organic matter for oils, varies widely – 0.36–1.47. The most “ancient” age (Devonian-Carboniferous) was determined for the oils of the Prikumsky swell and the water area of the Middle Caspian; in the Terek-Sunzha zone and Piedmont Dagestan, an increase in the proportion of St28 sterane is recorded in oils, which indicates a younger generation age (up to the Paleogene). The data obtained can be used to clarify the history of the formation of hydrocarbon accumulations in this region.

KW - Biomarkers

KW - Geochemistry

KW - Middle Caspian

KW - Oil age

KW - Oil fields

KW - Piedmont Dagestan

KW - Prikumsky swell

KW - Steranes

KW - Terek-Caspian oil and gas basin

KW - Terek-Sunzha zone

UR - http://www.scopus.com/inward/record.url?scp=85135041807&partnerID=8YFLogxK

U2 - 10.18599/grs.2022.2.17

DO - 10.18599/grs.2022.2.17

M3 - Article

AN - SCOPUS:85135041807

VL - 24.2022

SP - 186

EP - 191

JO - Georesursy

JF - Georesursy

SN - 1608-5043

IS - 2

ER -