Biostratigraphy and depositional environment of the Asmari Formation in Gachsaran Well No. 25

Geotechnical Geology

دوره 4، شماره 4، اسفند 2008، صفحه 277-286   

نوع مقاله: Original Research

نویسندگان

Iraj Maghfouri Moghadam^{* 1}؛ Mohammad Akbari²؛ Ali Rahmani²

¹Department of Geology, Faculty of Science, Lorestan University, Lorestan, Iran

²Geology Section of Iranian National Oil Company of Southern Oilfield District

چکیده

The Asmari Formation has been studied from biostratigraphic and depositional environment point of view in well No. 25, Gachsaran oil field. The thickness of the Asmari Formation in well No. 25 is 632 meters. The study of 220 thin sections taken from the studied well led to the identification of 47 genera and 48 species of benthonic foraminifera. According to the index foraminifera such as Eulipidina sp., Nepherolepidina sp., Borelis melo curdica., Miogipsinoides complanatus, the age of the Asmari Formation, studied in the subsurface, ranges from Oligocene (Rupelian-Chattian) to Early Miocene (Aquitania- Burdigalian). 10 carbonate microfacies were also identified within the Asmari Formation, well No. 25. The microfacies belong to the shallow open marine, barrier, restricted lagoon and lagoon environment.

کلیدواژه‌ها

Species؛ Genera؛ Benthonic foraminifera؛ Subsurface؛ Carbonate microfacies