Document Type : Original Research Paper

Authors

1 Ph.D. Student, Hormozgan University; Research Institute of Petroleum Industry, Tehran, Iran

2 Associate Professor, Research Institute of Petroleum Industry, Tehran, Iran

3 استادیار،‌ دانشگاه خوارزمی، تهران، ایران

Abstract

The Dalan Formation (Upper Permian) is mainly composed of limestone and dolostone with minor evaporite interbeds. Upper carbonates of the Dalan Formation constitute one of the main gas reservoirs in the Zagros fold thrust belt especially in the Fars and the Persian Gulf. The upper part of the Dalan Formation consists of oolitic grainstone with high reservoir quality. Based on sedimentological studies in the upper Dalan unit, seven microfacies have been recognized. This microfacies have been deposited in warm, arid intertidal, lagoon and shoal. They deposited in a homoclinal ramp. Different diagenetic process affected this unit are bioturbation, micritization, neomorphism, replacement, dolomitization, anhydritization, mechanical and chemical compaction, cementation, dissolution and fracturing. Based on the evidence like widespread dissolution, formation of moldic and vuggy porosity and precipitation of different types of meteoric cements and based on paragenetic sequences, it can be concluded that the studied interval, have not buried after the deposition, but at least some parts like oolitic shoal exposed subearially and was affected by meteoric diagenesis that was followed by deep burial diagenetic environment.

Keywords

شیخ‌پور، ح.، 1384- دیاژنز و ژئوشیمی بخش فوقانی سازند دالان و کنگان زیرین در میدان گازی پارس جنوبی. پایان‌نامه کارشناسی ارشد. دانشگاه تهران. 167 صفحه.
کاووسی، م. ع.، 1388- محیط‌های رسوبی و چینه‌نگاری سکانسی سازند مزدوران (ژوراسیک بالایی) در حوضه رسوبی کپه داغ، رساله دکتری دانشکده علوم، دانشگاه تربیت معلم تهران، 171 ص.
لاسمی، ی.، 1379- رخساره‌ها، محیط رسوبی و چینه‌نگاری سکانسی نهشته سنگ‌های پرکامبرین بالایی و پالئوزوئیک ایران، وزارت صنایع و معادن، سازمان زمین‌شناسی و اکتشافات معدنی کشور. 180 ص.
لطف‌پور، م.، 1384- چینه‌شناسی توالی‌ها، محیط رسوبی و بیواستراتیگرافی سازندهای دالان و کنگان در ناحیه زاگرس جنوبی با نگرشی ویژه بر مرز پرموتریاس. رساله دکتری دانشگاه شهید بهشتی. 400 صفحه.
مطیعی، ه.، 1372- چینه‌شناسی زاگرس. انتشارات سازمان زمین‌شناسی و اکتشاف معدنی کشور.
نجم‌آبادی، س.، 1372- گزارش نهایی زمین‌شناسی چاه شماره 1 میدان گازی پارس جنوبی، گزارش داخلی شرکت ملی نفت ایران.
 
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