نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه زمین‌شناسی، دانشکده علوم‌زمین، دانشگاه شهید بهشتی، تهران، ایران
2 اداره زمین‌شناسی بنیانی، شرکت ملی مناطق نفت‌خیز جنوب، اهواز، ایران
چکیده
در این نوشتار، سازند کربناتی فهلیان با سن کرتاسه پیشین (بریازین-هوتروین) به منظور شناسایی ریزرخساره‌ها، دیاژنز و بررسی کانیشناسی اولیه رسوبات در برش نمونه واقع در تاقدیس فهلیان و برش زیرسطحی(تحت الارضی) چاه 55 میدان نفتی گچساران مورد بررسی قرار گرفت. بررسی‌های سنگ‌نگاری منجر به شناسایی ده ریزرخساره شد که در 4 کمربند رخسارهای پهنه کشندی، لاگون، سد و دریای باز نهشته شده‌اند. با توجه به ریزرخساره‌های شناسایی شده، این توالی کربناتی بر روی یک سکوی کربناتی از نوع حاشیه‌دار(شلف) نهشته شده است. شناسایی سیمانهای مختلف نشان دهنده این است که سازند فهلیان به طور عمده تحت تأثیر دیاژنز هوازی قرار گرفته است. پراکندگی عناصر اصلی و فرعی و گستره ایزوتوپی اکسیژن 18 و کربن 13 آهکهای سازند فهلیان نشان دهنده ترکیب کانیشناسی اولیه آراگونیتی و همچنین تأثیر دیاژنز هوازی بر روی این نهشته‌ها در یک سیستم بسته و با نسبت آب به سنگ پایین است.
کلیدواژه‌ها
کتابنگاری
آدابی، م. ح.، 1383- ژئوشیمی رسوبی، انتشارات آرین زمین، 448 صفحه
هاشمی حسینی، پ.، 1385- بیواستراتیگرافی سازند فهلیان در برش الگو و چاه شماره 1 میدان نفتی دارا، پایان نامه کارشناسی ارشد، دانشگاه تهران، 197 صفحه.
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