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Depositional and diagenetic impact on reservoir quality of the Asmari carbonate reservoir, Naft-Sefid Oilfield, SW Iran | ||
Geopersia | ||
دوره 11، شماره 1 - شماره پیاپی 22287825، فروردین 2021، صفحه 219-243 اصل مقاله (16.01 M) | ||
نوع مقاله: Research Paper | ||
شناسه دیجیتال (DOI): 10.22059/geope.2020.309894.648576 | ||
نویسندگان | ||
Abdolmotaleb Haghighat؛ Mohsen Aleali* ؛ Nader K. Ghadimvand؛ Davood Jahani؛ Zahra Maleki | ||
Department of Geology, Science and Research Branch, Islamic Azad University, Tehran, Iran | ||
چکیده | ||
The Oligo-Miocene Asmari Formation is the most prolific reservoir in the Dezful Embayment, southwest of Iran. Depositional and diagenetic effects on reservoir quality in the sequence stratigraphic framework were carried out on the basis of petrographic investigation, petrophysical logs, and core measurement porosity and permeability data. Petrographic analysis resulted in the identification of 12 microfacies classified in 5 sub-environments including tidal flat, lagoon, barrier, shallow open marine and basin, which indicate deposition in a homoclinal ramp setting. Tidal flat, lagoonal and barrier microfacies are mostly present in the upper and middle parts of the Asmari Formation, while outer ramp microfacies largely developed in the middle part. Anhydrite and calcite cementation, compaction, dolomitization, dissolution, and fracturing are the main diagenetic controlling factors on petrophysical properties. Fracturing, dolomitization, and dissolution are contributed to reservoir quality enhancement, while compaction and cementation had negative effects on reservoir quality. The studied successions are represented by 3 third-order sequences of early Aquitanian, late Aquitanian and early Burdigalian ages that largely deposited in the highstand systems tract (HST) stage | ||
کلیدواژهها | ||
Asmari Formation؛ Dezful Embayment؛ Microfacies, Diagenesis, Reservoir quality | ||
عنوان مقاله [English] | ||
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مراجع | ||
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