PETROLEUM BIOMARKERS AS INDICATORS OF OIL ORIGIN AND MATURITY IN THE SOUTH-EASTERN PRECASPIAN BASIN
КАСПИЙ МАҢЫ ОЙПАТЫНЫҢ ОҢТҮСТІК-ШЫҒЫС БӨЛІГІНДЕГІ МҰНАЙДЫҢ ШЫҒУ ТЕГІ МЕН ЖЕТІЛГЕНДІГІНІҢ КӨРСЕТКІШІ РЕТІНДЕГІ МҰНАЙ БИОМАРКЕРЛЕРІ
НЕФТЯНЫЕ БИОМАРКЕРЫ КАК ИНДИКАТОРЫ ПРОИСХОЖДЕНИЯ И СТЕПЕНИ ЗРЕЛОСТИ НЕФТИ В ЮГО-ВОСТОЧНОЙ ЧАСТИ ПРИКАСПИЙСКОЙ ВПАДИНЫ
Jarassova T.S. Altunsoy M.
2025Kazakh-British Technical University
Herald of the Kazakh British Technical UNiversity
2025#22Issue 3340 - 346 pp.
This study investigates the origin of oil from the south-eastern Precaspian Basin through biomarker analysis of five crude oil samples using gas chromatography-mass spectrometry (GC-MS). Biomarkers serve as molecular fingerprints to elucidate hydrocarbon origin, source rock characteristics, and thermal history. The analyzed samples revealed: a marine depositional environment (C₂₆/C₂₅ terpane ratios = 0.59–0.79), carbonate-dominated source rocks (C₂₉/C₃₀ hopane ratios = 4.78–5.55), sourcing from Paleozoic (Permo-Carboniferous) strata (C₂₈/C₂₉ sterane ratios = 0.44–0.57), and peak oil window – late maturation according to Ts/T, C29 Ts / C29Tm, C₂₉ sterane isomerization ratios. These findings demonstrate the basins complex hydrocarbon generation history, with biomarker distributions indicating: marine organic matter input under anoxic conditions, carbonate-evaporitic source facies and thermal equilibrium consistent with primary oil generation. The results provide valuable insights for exploration strategies in similar frontier basins, with implications for reducing exploration risk and optimizing resource development. Future studies should combine these geochemical data with structural and stratigraphic analyses to refine migration models.
biomarker analysis , depositional environment , GC-MS , organic geochemistry , Precaspian Basin , source rock , sterane , terpane
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Atyrau Branch LLP “KMG Engineering”, Atyrau, Kazakhstan
Akdeniz University, Antalya, Turkey
Atyrau Branch LLP “KMG Engineering”
Akdeniz University
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