Abstract
The current paper is focused on the facies, sedimentary environment and depositional cycles study of the Middle-Late Permian sediments in the South Fars Zireh Gas Field, the subsurface section of well ZH-A. Four hundred thin-sections obtained from cores and cuttings were examined under standard petrographic microscope. For this study research, Corel Draw X6, Corel Photo-Paint, DN2 Microscopy Image Processing System, Scope Photo, Autodesk Map, Geocalc and Auto Cad 2014 were utilized. Based on microfacies analysis and significant founa and flora, fourteen major facies in four facies associations comprising tidal flat (A), lagoon (B), shoal (C) and open marine (D) identified in the well ZH-A. This formation was deposited in inner part of a homoclinal ramp. Based on depositional cycles, seven main 3rd order sequences were revealed in the Well ZH-A. The ooid grainstone facies with interparticle and oomoldic porosity has high reservoir potential. The diagenetic processes like dolomitization and dissolution have significant effect in the reservoir quality. Based on research results, a major framework can be weaved and used to correlate reservoir layering.
Highlights
The Middle-Late Permian Dalan Formation is an economically significant gas and condensate reservoir in the Fars region of southwest Iran
The current paper is focused on the facies, sedimentary environment and depositional cycles study of the Middle-Late Permian sediments in the South Fars Zireh Gas Field, the subsurface section of well ZH-A
The geographical coordinates of the studied subsurface section are 51 ̊56'57.83"E and 28 ̊10'23.82"N and overlie Zireh anticline which is located about 169 km from Shiraz city (Figure 1)
Summary
The Middle-Late Permian Dalan Formation is an economically significant gas and condensate reservoir in the Fars region of southwest Iran. Faraghan Formation and conduces to the Kangan Formation. This formation consists of limestone and dolomite accompanied by some evaporite intervals with an overall thickness of 815 m. Edgell [1] has divided the mentioned formation into three members containing: 1) Lower Dalan Member, 2) Nar Evaporite Member and 3) the Upper Dalan Member. The geographical coordinates of the studied subsurface section are 51 ̊56'57.83"E and 28 ̊10'23.82"N and overlie Zireh anticline which is located about 169 km from Shiraz city (Figure 1)
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