NDLI: The Miocene Gachsaran Formation evaporite cap rock, Zeloi oilfield, SW Iran

Content Provider	Springer Nature Link
Author	Soleimani, Bahman Bahadori, Alireza
Copyright Year	2014
Abstract	Petroleum at the Zeloi oilfield (SW Iran) is produced from the Oligocene/Miocene Asmari Formation. Evaporites in the overlying lowermost member of the Gachsaran Formation form an efficient cap rock seal. In the present study, this cap rock was studied and interpreted on the basis of gamma-ray and sonic logs data from eleven boreholes. Geochemical data obtained from X-ray fluorescence analyses of the anhydrite samples and scanning electron microscope analyses of the halite samples have been interpreted in terms of depositional environment. Chemostratigraphy based on the use of Na$_{2}$O/Al$_{2}$O$_{3}$, Na$_{2}$O/Fe$_{2}$O$_{3}$, Na$_{2}$O/TiO$_{2}$, and Na$_{2}$O/K$_{2}$O ratios allowed division of the cap rock into three marker units: (1) a unit of weathering-resistant elements; (2) an index key unit; and (3) a unit of highly soluble elements. The stratigraphy of the cap rock suggested the occurrence of cyclic regression and transgression. Geochemical data in combination with textural analyses in scanning electron microscopy indicate arid depositional conditions for this part of the Gachsaran Formation. Cycles of marine transgression–regression taking place in a barred coastal sabkha-lagoon basin, must have been responsible for the formation of the evaporite sequences of the Gachsaran Formation.
Starting Page	287
Ending Page	306
Page Count	20
File Format	PDF
ISSN	08912556
Journal	Carbonates and Evaporites
Volume Number	30
Issue Number	3
e-ISSN	18785212
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-08-03
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Gachsaran Formation Oligocene/Miocene Cap rock Zeloi oilfield Iran Dezful embayment Evaporite Anhydrite Sabkha Lagoon Geology Mineral Resources Mineralogy
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology

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