نویسندگان
1 دانشگاه ازاد تهران شمال
2 دانشگاه آزاد اسلامی، گروه زمین شناسی، مشهد، ایران
3 دانشگاه آزاد تهران شمال
4 دانشیار گروه زمین شناسی، دانشکده علوم پایه، دانشگاه آزاد اسلامی، واحد تهران شمال، تهران ، ایران
5 تهران
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
The Lower Cretaceous Tirgan Formation (Barmian-Aptian) is exposed in the west of the Kepe Dagh sedimentary basin in the northwest of Chaman Bid village. In this study, the Sorkh Qhale section of the Tirgan formation with a thickness of 315 meters was measured and taken. Based on field studies, petrographic studies, textural and facies characteristics, 16 carbonate microfacies have been identified. Facies analysis led to the identification of tidal environments, lagoons, shoals and open marine environments with low to high energy conditions. Due to the wide lateral distribution of microfacies and the absence of distinct depth changes, the sedimentary paleosystem probably represents a hemoclinal ramp towards the west. There are three sequence boundaries of SB2 type in the studied sequences. According to the study, from the west of the basin to the east, the thickness of carbonate sediments has decreased. During the Aptian, the basin is transformed into an open marine system. The occurrence of such changes reflects tectonic events and global sea level rise during the deposition of the Tirgan Formation in the Kepe Dagh Basin. Based on the organic geochemical characteristics of the Tirgan formation in the region, the studied samples have kerogen type III and are in the maximum maturity stage of the oil window until the stage of wet and dry gas production.
کلیدواژه‌ها [English]
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