Determination of main reservoir controlling factors of Asmari Formation in Naft-Sefied oil field, Northern Dezful Embayment

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SALMANI A.; RAHIMPOUR BONAB H.; RANJBARAN M.; Aleali s.m.

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Journal: GEOSCIENCES Year:2019 | Volume:28 | Issue:111 Page(s): 215-226

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Title

Determination of main reservoir controlling factors of Asmari Formation in Naft-Sefied oil field, Northern Dezful Embayment

Author(s)

SALMANI A. | RAHIMPOUR BONAB H. | RANJBARAN M. | Aleali s.m. | Issue Writer Certificate

Keywords

Asmari FormationQ2

Naft-e sefid oil fieldQ1

DiagenesisQ2

Sedimentary environmentQ2

Sequence stratigraphyQ2

Abstract

Asmari Formation (Oligocene-Miocene) is the first fractured proliferous carbonate reservoir that ever known in the world and is the most important hydrocarbon reservoir in Iran. The large quantity of the produced oil in Dezful Embayment is from this formation. Thin section studies in this formation lead to identification of eight microfacies related to the homoclinal ramp with three subdivisions (inner ramp, middle ramp and outer ramp). Many diagenetic processes such as; micritization, neomorphism, bioturbation, dolomitization, dissolution, cementation, mechanical and chemical compaction, fracturing have affected the Asmari carbonates in studied oil field during eogenesis, mesogenesis and telogenesis processes. Three sequences (third order) have been identified based on Sequence stratigraphy studies. Based on all results from this study it could be pointed out that; dolomitization, dissolution and cementation are the most important factors that controlled the reservoir quality in this field. Cementation (calcite and anhydrite cements with different fabrics) reduced reservoir quality in different facies. Seemingly, fabric destructive dolomitization increased reservoir quality with creating intercrystaline porosity in mudstone facies and connecting isolated pores (via dissolution) in most of facies. Dissulotion has prime importance where occurred and increased reservoir quality. Contrasting to the other Asmari hydrocarbon fields in Zagros which fracturing is the most important factor in increasing reservoir quality, in Naft-Safid oil field, most of fractures have been filled by calcite cement. Thus, diagenetic imprints (such as dissolution and dolomitization) have more effects on increasing reservoir quality than fracturing.

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APA: Copy

SALMANI, A., RAHIMPOUR BONAB, H., RANJBARAN, M., & Aleali, s.m.. (2019). Determination of main reservoir controlling factors of Asmari Formation in Naft-Sefied oil field, Northern Dezful Embayment. GEOSCIENCES, 28(111 ), 215-226. SID. https://sid.ir/paper/32205/en

Vancouver: Copy

SALMANI A., RAHIMPOUR BONAB H., RANJBARAN M., Aleali s.m.. Determination of main reservoir controlling factors of Asmari Formation in Naft-Sefied oil field, Northern Dezful Embayment. GEOSCIENCES[Internet]. 2019;28(111 ):215-226. Available from: https://sid.ir/paper/32205/en

IEEE: Copy

A. SALMANI, H. RAHIMPOUR BONAB, M. RANJBARAN, and s.m. Aleali, “Determination of main reservoir controlling factors of Asmari Formation in Naft-Sefied oil field, Northern Dezful Embayment,” GEOSCIENCES, vol. 28, no. 111 , pp. 215–226, 2019, [Online]. Available: https://sid.ir/paper/32205/en

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