BIOSTRATIGRAPHY AND MICROFACIES ANALYSIS OF THE SHAHBAZAN AND ASMARI FORMATIONS (THROUGH EOCENE TO OLIGOCENE) IN THE CARBONATE DEPOSITS OF NORTHWEST DEZFUL EMBAYMENT, ZAGROS SEDIMENTARY BASIN

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GHOLAMPOUR MUGAHI S.; VAZIRI MOGHADDAM H.; SALEHI M.A.; ARZANI N.; ARMOON A.

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Journal: IRANIAN JOURNAL OF PETROLEUM GEOLOGY Year:2017 | Volume:7 | Issue:13 Page(s): 20-42

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Title

BIOSTRATIGRAPHY AND MICROFACIES ANALYSIS OF THE SHAHBAZAN AND ASMARI FORMATIONS (THROUGH EOCENE TO OLIGOCENE) IN THE CARBONATE DEPOSITS OF NORTHWEST DEZFUL EMBAYMENT, ZAGROS SEDIMENTARY BASIN

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Keywords

SHAHBAZAN FORMATIONQ1

ASMARI FORMATIONQ2

BIOSTRATIGRAPHYQ2

DEPOSITIONAL ENVIRONMENTQ2

BALARUD FIELDQ1

Abstract

In this research based on petrography study of 320 thin sections (cutting samples), BIOSTRATIGRAPHY, microfacies and DEPOSITIONAL ENVIRONMENT analysis has been done to determine the boundary between the Shahbazan and ASMARI FORMATIONs in well No.1 of the Balarud Oil Field, located in the north of Dezful embayment. The SHAHBAZAN FORMATION with 460 meters thick with mainly composed of dolomite along with interlayers of limestone, shale and anhydrite in the studied well. The lower boundary of this formation with the Pabdeh Formation is conformable and its upper boundary with the ASMARI FORMATION is marked by an unconformity. The ASMARI FORMATION with thickness of 140 meters mainly consists of limestone and shale with the interlayers of dolomite; its upper boundary to the Gachsaran Formation is conformable. BIOSTRATIGRAPHY studies documented a high diversity of shallow-water benthic and rare planktonic foraminiferas and led to the determining of one assemblage zone in the SHAHBAZAN FORMATION (15 genera and 8 species) that indicates age of the Priabonain. Three assemblage zones also were recognized in the ASMARI FORMATION (12 genera and 8 species) that, shows the age of the ASMARI FORMATION from Mid-Rupelian to the Chattian, Aquitanian and Burdigalin. Based on BIOSTRATIGRAPHY studies, the boundary between Shahbazan and ASMARI FORMATIONs and the position of an unconformity between them were determined. The facies analysis led to recognition of eight microfacies for the SHAHBAZAN FORMATION which belong to three facies belts of inner (tidal flat and lagoon), middle and outer ramp, deposited on a ramp-type carbonate platform. Also four microfacies were recognized in the ASMARI FORMATION which are related to the inner carbonate platform.

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APA: Copy

GHOLAMPOUR MUGAHI, S., VAZIRI MOGHADDAM, H., SALEHI, M.A., ARZANI, N., & ARMOON, A.. (2017). BIOSTRATIGRAPHY AND MICROFACIES ANALYSIS OF THE SHAHBAZAN AND ASMARI FORMATIONS (THROUGH EOCENE TO OLIGOCENE) IN THE CARBONATE DEPOSITS OF NORTHWEST DEZFUL EMBAYMENT, ZAGROS SEDIMENTARY BASIN. IRANIAN JOURNAL OF PETROLEUM GEOLOGY, 7(13 ), 20-42. SID. https://sid.ir/paper/253068/en

Vancouver: Copy

GHOLAMPOUR MUGAHI S., VAZIRI MOGHADDAM H., SALEHI M.A., ARZANI N., ARMOON A.. BIOSTRATIGRAPHY AND MICROFACIES ANALYSIS OF THE SHAHBAZAN AND ASMARI FORMATIONS (THROUGH EOCENE TO OLIGOCENE) IN THE CARBONATE DEPOSITS OF NORTHWEST DEZFUL EMBAYMENT, ZAGROS SEDIMENTARY BASIN. IRANIAN JOURNAL OF PETROLEUM GEOLOGY[Internet]. 2017;7(13 ):20-42. Available from: https://sid.ir/paper/253068/en

IEEE: Copy

S. GHOLAMPOUR MUGAHI, H. VAZIRI MOGHADDAM, M.A. SALEHI, N. ARZANI, and A. ARMOON, “BIOSTRATIGRAPHY AND MICROFACIES ANALYSIS OF THE SHAHBAZAN AND ASMARI FORMATIONS (THROUGH EOCENE TO OLIGOCENE) IN THE CARBONATE DEPOSITS OF NORTHWEST DEZFUL EMBAYMENT, ZAGROS SEDIMENTARY BASIN,” IRANIAN JOURNAL OF PETROLEUM GEOLOGY, vol. 7, no. 13 , pp. 20–42, 2017, [Online]. Available: https://sid.ir/paper/253068/en

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