نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه زمین‌شناسی، دانشکده علوم پایه، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران

2 استاد، دانشکده زمین‌شناسی، پردیس علوم، دانشگاه تهران، تهران، ایران

3 استاد، گروه زمین‌شناسی، پردیس علوم، دانشگاه فردوسی مشهد، مشهد، ایران

4 استادیار، گروه زمین‌شناسی، واحد تهران شمال، دانشگاه آزاد اسلامی، تهران، ایران

5 کارشناس، شرکت نفت وگاز پارس، تهران، ایران

چکیده

سازند کنگان با سن تریاس پیشین از مهم‌ترین سنگ‌های مخزن کربناتی در جنوب باختر ایران و شمال خلیج فارس است. تحلیل رخساره‌های سازند کنگان به شناسایی 13 ریزرخساره مربوط به محیط پهنه کشندی، لاگون، پشته‌های سدی(شول) و دریای باز انجامیده است. بررسی تغییرات افقی و عمودی رخساره‌ها و مقایسه آنها  با محیط‌های عهد حاضر و  دیرینه نشان‌دهنده آن است که سازند کنگان در  سکویی (پلت فرم)از نوع رمپ کربناتی کم‌ژرفا همانند خلیج فارس امروزی، نهشته شده است. مطالعات چینه نگاری سکانسی نشان می دهد که سازند کنگان از دو سکانس رسوبی دسته سوم (در چاه‌های  Aو B) و دسته‌های رسوبی  TSTوHST  تشکیل شده است. مرز زیرین سکانس نخست، ناپیوستگی نوع 1(SB1)   و دیگر مرزها ناپیوستگی نوع 2 (SB2) است. تخلخل در سازند کنگان به طور عمده در دسته رسوبی HST Early و گرینستون‌های شول تمرکز یافته است. افزون بر آن در این نوشتار افق‌های اصلی همچون مرز ناپیوستگی، بیشینه طغیان سطح آب دریا، الگوهای بر انبارش و دسته‌های رسوبی مورد بررسی قرار گرفته است.

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