kaz29Вестник Казахстанско-Британского технического университетаHerald of the Kazakh-British Technical University1998-66882959-8109Казахстанско-Британский Технический Университет10.55452/1998-6688-2026-23-1-406-419kaz29-2534Research ArticleНЕФТЕГАЗОВАЯ ИНЖЕНЕРИЯ И ГЕОЛОГИЯOIL AND GAS ENGINEERING, GEOLOGYМОЛЕКУЛЯРНЫЕ ОСОБЕННОСТИ НЕФТЕЙ ЭМБИНСКОГО РАЙОНА (ПРИКАСПИЙСКИЙ БАССЕЙН): ПРОИСХОЖДЕНИЕ, ТЕРМИЧЕСКАЯ ЗРЕЛОСТЬ И ГЕНЕТИЧЕСКАЯ КОРРЕЛЯЦИЯMOLECULAR FEATURES OF OILS FROM THE EMBA REGION (PRECASPIAN BASIN): ORIGIN, THERMAL MATURITY, AND GENETIC CORRELATIONhttps://orcid.org/0000-0002-2900-9872ДжарасоваТ. С.JarassovaT. S.

PhD

г. Атырау

PhD

Atyrau

t.jarassova@kmge.kzhttps://orcid.org/0000-0002-3140-6682АлтунсойМ.AltunsoyM.

д.т.н.

г. Анталья

Dr. Tech. Sc.

Antalya

altunsoy@akdeniz.edu.trАФ ТОО «КМГ Инжиниринг»,КазахстанAtyrau Branch LLP “KMG Engineering”KazakhstanУниверситет АкденизТурцияAkdeniz UniversityTurkey202629032026231406419Copyright © Джарасова Т.С., Алтунсой М., 20262026Джарасова Т.С., Алтунсой М.Jarassova T.S., Altunsoy M.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://vestnik.kbtu.edu.kz/jour/article/view/2534

Прикаспийский бассейн, включая его юго-восточную часть, является уникальной нефтегазоносной провинцией с гигантскими месторождениями, такими как Тенгиз и Кашаган, запасы которых оценив в миллиарды тонн. Несмотря на обширные исследования региона, вопросы генетической принадлежности нефтей и условий их палеообразования требуют дополнительных геохимических анализов нефтяных проб. Для проведения комплексной геохимической характеристики и генетической корреляции нефтей Эмбинского региона с акцентом на анализ молекулярных маркеров для реконструкции условий нефтеобразования было отобрано семь нефтяных проб из различных стратиграфических горизонтов. В исследовании использовались современные аналитические методы: газовая хроматография (Agilent 7890B) для детального анализа н-алканов и изопреноидов (пристана и фитана) и хромато-масс-спектрометрия в режиме регистрации выбранных ионов m/z 191, 217 для идентификации терпанов и стеранов соответственно. Особое внимание было уделено расчету ключевых геохимических индексов (изопреноидных, гопановых, отношений стерановой изомеризации), а также построению диагностических диаграмм. Результаты указывают на морское происхождение исследуемых нефтей с доминированием карбонатных материнских пород (C₂₇ стераны > 30%, C₂₉/C₃₀ гопаны > 1). Отношения Pr/Ph (0,79–1,07) и повышенное содержание C₃₅ гомогопанов свидетельствуют об образовании в восстановительных условиях. Параметры термической зрелости (Ts/(Ts+Tm) = 0,15–0,64; C₂₉ ββ/(αα+ββ) = 0,55–0,71) подтверждают генерацию проб в главной зоне нефтеобразования. Генетическая корреляция объединила все образцы в одну нефтяную семью морского карбонатного проис- хождения. Полученные выводы имеют практическую значимость для прогнозирования аналогичных скоплений в регионе.

The Precaspian Basin, including its southeastern part, represents a unique oil and gas province with giant fields such as Tengiz and Kashagan, whose reserves are estimated in billions of tons. Despite extensive research in the region, questions regarding the genetic affiliation of oils and their paleoformation conditions require additional geochemical analyses of oil samples. To conduct a comprehensive geochemical characterization and genetic correlation of oils from the Emba region, with a focus on molecular marker analysis to reconstruct oil formation conditions seven oil samples were taken from various stratigraphic horizons. The study employed advanced analytical techniques gas chromatography (Agilent 7890B) for detailed analysis of n-alkanes and isoprenoids (pristane and phytane) and gas chromatography-mass spectrometry in selected ion monitoring mode m/z 191, 217 for terpane and sterane identification, respectively. Particular emphasis was placed on the computation of essential geochemical indices isoprenoid, hopane, and sterane isomerization ratios along with the generation of diagnostic plots. The results indicate a marine origin of the studied oils with dominant carbonate source rocks (C₂₇ steranes > 30%, C₂₉/C₃₀ hopanes > 1). Pr/Ph ratios (0.79–1.07) and elevated C₃₅ homohopanes suggest formation under reducing conditions. Thermal maturity parameters (Ts/(Ts+Tm) = 0.15–0.64; C₂₉ ββ/(αα+ββ) = 0.55–0.71) confirm that the samples were generated during the oil window. Genetic correlation grouped all samples into a single oil family of marine carbonate origin. The findings are practically significant for predicting analogous accumulations in the region.

Прикаспийский бассейнгеохимия нефтиГХ-МСбиомаркерытермическая зрелостьматеринские породывосстановительные условияморская средагенетическая корреляцияPrecaspian Basinoil geochemistryGC-MSbiomarkersthermal maturitysource rocksreducing conditionsmarine environmentgenetic correlationThe authors of the work would like to pay special regards to Embamunaigas JSC for the provision of geochemical data that are used in this study and permission to publish this work. The information provided by Embamunaigas JSC is colossal towards the success of this study. The authors wish to extend their sincere appreciation to the Caspimunaigas Scientific-Research and Design Institute JSC whose assistance was a milestone in the completion of this project. This work was supported by Akdeniz University Scientific Research Projects Coordination Unit. Project Number: FDK-2020-5083.ReferencesAzhgaliev, D.K. 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The authors declare that there are no conflicts of interest present.