دوفصلنامه رسوب شناسی کاربردی

دوفصلنامه رسوب شناسی کاربردی

مطالعات سنگ ­شناختی و ژئوشیمی عنصری به منظور درک توالی ­های دیاژنزی و مدل دولومیتی شدن سازند آسماری، تاقدیس قوار، جنوب لرستان

نویسندگان
1 دانشجوی کارشناسی‌ارشد مهندسی نفت، واحد مشهد، دانشگاه آزاد اسلامی، مشهد، ایران
2 گروه مهندسی نفت، معدن و زمین‌شناسی، واحد مشهد، دانشگاه آزاد اسلامی، مشهد، ایران
3 شرکت ملی حفاری ایران، ایران
چکیده
در این پژوهش از مطالعات بافتی و زمین­شیمی عنصری به منظور تحلیل فرآیندهای دیاژنزی، توالی­های پاراژنزی و مدل دولومیتی­شدن نهشته­های سازند آسماری بهره گرفته شده است. برش مورد نظر با ضخامت 106 متر از واحدهای کربناته - دولومیتی تشکیل شده است که از این برش 106 نمونه مقطع نازک پتروگرافی تهیه شده است. تعداد 12 نمونه از دولومیت­ها جهت تعیین مدل دولومیتی­شدن سازند به روش EDX مورد آنالیز عنصری قرار گرفته است. مطالعات سنگ­شناسی منجر به شناسایی چندین فرآیند دیاژنزی از جمله میکرایتی شدن، نوریختی، سیمانی شدن، فشردگی، انحلال و جانشینی شد که در نهایت مدل دیاژنزی و توالی­های پاراژنزی آن تعیین گردید. براساس شواهد سنگ­شناسی، توالی پاراژنتیکی نهشته­های سازند آسماری در برش تاقدیس قوار در چهار محیط دریایی، تدفینی، بالاآمدگی و آب شیرین تفسیر شده است. این فرآیندها در طی سه مرحله دیاژنزی اولیه (ائوژنز)، میانی (مزوژنز) و نهایی (تلوژنز) رخ داده است. مهم­ترین فرآیند دیاژنزی در برش مورد مطالعه دولومیتی­شدن است که بخش عمده­ای از توالی­های کربناته سازند آسماری را دولومیتی کرده است. دو گروه از دولومیت­ها بر اساس مطالعات بافتی و زمین­شیمی عنصری شناسایی گردید. دولومیت­های اولیه (با تمرکز پایین Fe و Mnو تمرکز بالایی از Mg، Sr) و دولومیت­های ثانویه (با تمرکز بالایی از Fe و Mn و تمرکز پایین Mg و Sr). دولومیت­های نوع اول از نوع رسوبی و مربوط به پهنه جزرومدی و دولومیت­های ثانویه از نوع دیاژنزی و مربوط به محیط دیاژنزی تدفینی کم­عمق تا متوسط می­باشند.
کلیدواژه‌ها

عنوان مقاله English

Petrographic and elemental geochemical studies for investigating diagenetic sequences and the dolomitization model of the Asmari Formation, Qawar Anticline, Southern Lorestan

نویسندگان English

L. Kabizadeh Arab 1
M. Allameh 2
R. Mokfi 3
1 M. Sc. Student, Dept., of Petroleum Engineering, Ma. C., Islamic Azad University, Mashhad, Iran
2 Dept., of Petroleum Engineering, Mining and Geology, Ma. C., Islamic Azad University, Mashhad, Iran
3 National Iranian Drilling Company, Iran
چکیده English

This study utilized textural and elemental geochemical analyses to investigate diagenetic processes, paragenetic sequences, and the dolomitization model of the Asmari Formation deposits. The studied section, with a thickness of 106 meters, consists of carbonate-dolomitic units, from which 106 thin sections were prepared for petrographic analysis. Twelve dolomite samples were analyzed for elemental composition using EDX to determine the dolomitization model of the formation. Petrographic studies identified several diagenetic processes including micritization, neomorphism, cementation, compaction, dissolution, and replacement, ultimately establishing the diagenetic model and paragenetic sequences. Based on petrological evidence, the paragenetic sequence of the Asmari Formation deposits in the Qawar Anticline section was interpreted in four environments: marine, burial, uplift, and freshwater. These processes occurred during three diagenetic stages: early (eogenesis), middle (mesogenesis), and late (telogenesis). The most significant diagenetic process in the studied section was dolomitization, which has converted a major portion of the Asmari Formation's carbonate sequences into dolomite. Two groups of dolomites were identified based on textural and elemental geochemical studies: primary dolomites (with low Fe and Mn concentrations and high Mg and Sr concentrations) and secondary dolomites (with high Fe and Mn concentrations and low Mg and Sr concentrations). The primary dolomites are of sedimentary origin and related to the tidal zone, while the secondary dolomites are of diagenetic origin and associated with shallow-to-intermediate burial diagenetic environments.

کلیدواژه‌ها English

Asamari Formation
Diagenetic
Zagros
Lorestan
Qawar Anticline
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  • تاریخ دریافت 03 شهریور 1404
  • تاریخ بازنگری 26 مهر 1404
  • تاریخ پذیرش 03 آبان 1404