Study of the different anhydrite textures, dolomites and the investigation of reservoir quality of Dalan Formation in one of well in South Pars Oil field

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Fallah Bagtash R.; ADABI M.H.; MOVAHED B.

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Journal: Researches in Earth Sciences Year:2011 | Volume:2 | Issue:6 Page(s): 42-61

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Title

Study of the different anhydrite textures, dolomites and the investigation of reservoir quality of Dalan Formation in one of well in South Pars Oil field

Author(s)

Fallah Bagtash R. | ADABI M.H. | MOVAHED B. | Issue Writer Certificate

Keywords

Different textures of anhydriteQ2

DolomitizationQ2

Reservoir qualityQ2

Dalan FormationQ2

Flow unitQ2

Abstract

The Dalan (Permian) and the Kangan formations (Triassic) which are the largest gas reservoirs, contain 50 percent of gas reserves in the Zagros region and the Persian Gulf. The Dalan Formation with carbonate-evaporate facies overlies the silisiclastic Faraghon Formation and is overlain by the carbonates of the Kangan Formation. This study aims to identify microfacies and interpret the sedimentary environment and diagenetic processes of the Dalan Formation in well #X in the South Pars Oil field. Microscopic studies resulted in identifying four facies with abbreviations A, B, C and D. In terms of sedimentary environment, these facies belong to four facies belts: tidal flat, lagoon, carbonate shoal and open marine. According to identified microfacies, these carbonate successions were laid down on a carbonate platform, a homocline ramp type. The most important diagenetic processes in this study is anhydrite and dolomite formations. Anhydrite cement is very common diagenetic processes after Dolomitization. Petrographic studies of the Dalan Formation in this area indicate that anhydrite cement as a diagenetic product, has blocked most of the existing porosity. Among the Different textures of anhydrite, the pore filling and pervasive texture has the greatest effect on Reservoir quality. Distribution of anhydrite and with its extension within dolograinstone and grain-supported dolopackstone facies, and filling of the entire pore during shallow burial, has greatly reduced their Reservoir quality. But on the other hand, due to the solubility of anhydrite cement in the later stages of diagenesis, and creation of secondary porosity, their Reservoir quality has improved. The results of this study show that anhydrite cement has formed mostly in dolomitic facies which suggests the effect of sulfate and magnesium-rich brines is in the process of Dolomitization. Four types of dolomites have been identified according to the petrographic studies. Four Flow units and eight reservoir zones have been recognized for Dalan sequence using porosity and permeability data, petrophysics logs, Lorenz method and log FZI.

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APA: Copy

Fallah Bagtash, R., ADABI, M.H., & MOVAHED, B.. (2011). Study of the different anhydrite textures, dolomites and the investigation of reservoir quality of Dalan Formation in one of well in South Pars Oil field. RESEARCHES IN EARTH SCIENCES, 2(6 ), 42-61. SID. https://sid.ir/paper/207347/en

Vancouver: Copy

Fallah Bagtash R., ADABI M.H., MOVAHED B.. Study of the different anhydrite textures, dolomites and the investigation of reservoir quality of Dalan Formation in one of well in South Pars Oil field. RESEARCHES IN EARTH SCIENCES[Internet]. 2011;2(6 ):42-61. Available from: https://sid.ir/paper/207347/en

IEEE: Copy

R. Fallah Bagtash, M.H. ADABI, and B. MOVAHED, “Study of the different anhydrite textures, dolomites and the investigation of reservoir quality of Dalan Formation in one of well in South Pars Oil field,” RESEARCHES IN EARTH SCIENCES, vol. 2, no. 6 , pp. 42–61, 2011, [Online]. Available: https://sid.ir/paper/207347/en

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