gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2021-12-3-0541gtcrust-1242Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSТЕКТОНИЧЕСКИЕ И ЭРОЗИОННЫЕ ОСОБЕННОСТИ И ИХ ВЛИЯНИЕ НА ЗОНАЛЬНОЕ РАСПРЕДЕЛЕНИЕ ВЕРХНЕТРИАСОВЫХ И НИЖНЕМЕЛОВЫХ ОТЛОЖЕНИЙ ЕВФРАТСКОГО ГРАБЕНА (СИРИЯ)TECTONIC AND EROSION FEATURES, AND THEIR INFLUENCE ON ZONAL DISTRIBUTION OF THE UPPER TRIASSIC AND THE LOWER CRETACEOUS SEDIMENTS IN THE EUPHRATES GRABEN AREA, SYRIAЮсефИ.YousefI.

420008, Казань, ул. Кремлевская, 4/5

4-5 Kremlyovskaya St, Kazan 420008

ibrahem.youseef@mail.ruМорозовВ. П.MorozovV. P.

420008, Казань, ул. Кремлевская, 4/5

4-5 Kremlyovskaya St, Kazan 420008

Эль КадиМохаммадEl KadiMohammadАлааАбдуллаAlaaAbdullahИнститут геологии и нефтегазовых технологий, Казанский федеральный университетРоссияInstitute of Geology and Petroleum Technologies, Kazan Federal UniversityRussian FederationУниверситет ДамаскаСирияDamascus UniversitySyrian Arab Republic202117092021123608627Copyright © Юсеф И., Морозов В.П., Эль Кади М., Алаа А., 20212021Юсеф И., Морозов В.П., Эль Кади М., Алаа А.Yousef I., Morozov V.P., El Kadi M., Alaa A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/1242

На основе региональной структурной и стратиграфической геологический модели с использованием выбранных геолого-геофизическх данных и с помощью геологического программного обеспечения «Petrel Schlumberger» были изучены и обобщены тектонические и эрозионные особенности и их влияние на зональное распространение и изменение мощности осадочных отложений верхнетриасовых (формация Мулусса Ф) и нижнемеловых (формация Рутба) отложений вдоль Евфратского грабена.

Верхнетриасовые и нижнемеловые отложения (суммарная мощность около 800 м), считающиеся основными пластами-коллекторами углеводородов вдоль месторождений Евфратского грабена, содержат приблизительно от 80 до 90 % объема углеводородов, сохранившихся в этом районе. Осадочные зоны верхнетриасовых и нижнемеловых отложений Евфратского грабена подвергались различным изменениям в зональном распространении и мощности из-за эрозии, вызванной комплексом региональных несогласий вдоль Евфратского грабена. Этими несогласиями являются базовое верхнемеловое несогласие (BKU) и базовое нижнемеловое несогласие (BKL). Максимальная мощность 480 м верхнетриасовых отложений сохранилась в центральной части Евфратского грабена и в направлении с северо-запада на юго-восток, это направление погружения верхнетриасовой формации Мулусса Ф. Мощность верхнетриасовых отложений постепенно уменьшалась к северо-восточным флангам грабена вблизи поднятия Хлейсса и к юго-западным флангам вблизи поднятия Рутба из-за частичного или полного среза этих отложений в результате эрозии, вызванной несогласием BKL, и из-за меньшего пространства для накопления осадков вблизи этих поднятий. Максимальная мощность нижнемеловых отложений приблизительно 320 м, при этом толщина осадков увеличивается на северном, северо-западном и северо-восточном флангах Евфратского грабена. Наибольшая степень эрозии вследствие влияния несогласия BKU на нижнемеловые отложения отмечается вдоль южного, юго-восточного и юго-западного флангов Евфратского грабена. Толщина верхнетриасовых и нижнемеловых отложений вдоль районов Жора и Пальмира к северо-западным флангам грабена сохраняется неизменной из-за меньшего влияния эрозии, вызванной несогласиями BKL и BKU, а также из-за большего пространства для накопления осадков вдоль этих районов.

We have investigated the tectonic and erosion features of the Upper Triassic (Mulussa F Formation) and Lower Cretaceous (Rutbah Formation) sediments in the Euphrates graben area and analysed their influence on changes in the thickness and zonal distribution patterns of these sediments. In this study, the geological modeling software of Petrel Schlumberger is used to model the regional geological structure and stratigraphy from the available geological and geophysical data.

The Upper Triassic and Lower Cretaceous sediments (in total, almost 800 m thick) are the major hydrocarbon reservoirs in the Euphrates graben, which contain approximately 80 to 90 % of the total hydrocarbon reserve in this area. These sedimentary zones experienced variable changes in thickness and zonal distribution due to erosion processes caused by the two major regional unconformities, the Base Upper Cretaceous (BKU) and Base Lower Cretaceous (BKL) unconformities. The maximum thickness of the Upper Triassic sediments amounts to 480 m in the central parts of the Euphrates graben and along the NW-SE trend, i.e. in the dip direction of the Upper Triassic Mulussa F Formation. Towards the NE flank of the graben near the Khleissia uplift and the SW flank near to the Rutbah uplift, the thickness of the Upper Triassic sediments is gradually decreased due to their partial or total erosion caused by the BKL unconformity, and also due to a less space for sediment accumulation near the uplifts. The thickness of the Lower Cretaceous sediments increases in the northern, NW and NE flanks of the graben. Their maximum thickness is about 320 m. The BKL unconformity is the major cause of erosion of the Lower Cretaceous sediments along the southern, SE and SW flanks of the graben. In the Jora and Palmyra areas towards the NW flank of the Euphrates graben, the Upper Triassic and Lower Cretaceous sediments show no changes in thickness. In these areas, there was more space for sediment accumulation, and the sediments were less influenced by the BKL and BKU unconformities and thus less eroded.

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The authors declare that there are no conflicts of interest present.