نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه زمین شناسی نفت و حوضه های رسوبی، دانشکده علوم زمین، دانشگاه شهید چمران اهواز، اهواز، ایران
2 اداره زمین شناسی، شرکت ملی مناطق نفتخیز جنوب، اهواز، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
The Asmari Formation, one of the most important carbonate reservoirs in the Zagros Basin, was studied in the Chahar Bishe oil field to identify its facies, depositional environments, and sequence stratigraphic framework. Examination of 316 meters of core and cutting samples of a Well from Chahar Bishe oilfield led to the recognition of fourteen carbonate facies deposited within four main facies belts: tidal flat, semi-restricted lagoon, reefal barrier, and open marine. The vertical succession of facies indicates a general shallowing-upward trend from open-marine to nearshore environments, suggesting deposition on a low-angle homoclinal carbonate ramp. Sequence stratigraphic analysis resulted in the identification of four third-order depositional sequences, each composed of a Transgressive Systems Tract (TST) and a Highstand Systems Tract (HST). Type-2 sequence boundaries and Maximum Flooding Surfaces (MFS) were clearly recognized, reflecting relative sea-level fluctuations during the Miocene. The results of this study define the Asmari Formation as a homoclinal carbonate ramp in which facies distribution was mainly controlled by sea-level oscillations and variations in depositional energy.
کلیدواژهها [English]
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