دوفصلنامه رسوب شناسی کاربردی

دوفصلنامه رسوب شناسی کاربردی

چینه‌نگاری سکانسی بخش آهکی مَند (ژوراسیک میانی) در جنوب فروافتادگی دزفول، جنوب باختری ایران

نویسندگان
1 استادیار گروه زمین‌شناسی، دانشگاه پیام‌نور، تهران، ایران
2 اداره اکتشاف شرکت ملی نفت، تهران، ایران
چکیده
بخش آهکی مَند عنوان غیررسمی یک واحد سنگ‌چینه‌ای شاخص در مناطق مرکزی و خاوری زاگرس است که مرز ژوراسیک میانی-پسین بر انتهای آن منطبق است. به‌منظور آگاهی از شرایط محیطی و سکانس‌های رسوبی این واحد آهکی در جنوب فروافتادگی دزفول، داده‌های زمین‌شناسی و ژئوفیزیکی حاصل از حفاری دو حلقه چاه از میدان‌های نفتی چهاربیشه و میلاتون بررسی شده ‌است. در این بُرش‌ها، بخش آهکی مَند 125 و 140 متر ستبرا دارد و از دو واحد کربناته تمیز (پرتوی گامای کم) تشکیل شده ‌است که با یک افق شیلی (رُسی) از هم جدا شده‌اند. سنگ‌نگاری 80 مقطع نازک تهیه ‌شده از خرده‌ها و مغزه‌های حفاری نشان داد که گرینستون‌های اینتراکلاستی- اُاُییدی و پلوییدی ریزرخساره‌های اصلی بخش مَند در این ناحیه هستند که با وکستون‌های اسکلتی (روزنداران، جلبک‌های سبز و اسپیکول اسفنج) و مادستون‌های آهکی همراهی می‌شوند. یافته‌های این تحقیق حاکی است که این مجموعه رسوبی در زیرمحیط‌های مختلف یک رمپ هموکلینال شامل تالاب، شول (سد) اُاُلیتی و دریای باز نهشته شده‌ است. همچنین، تلفیق داده‌های چینه‌نگاری با یافته‌های حاصل از بررسی نمودارهای چاه‌پیمایی (اشعه گاما- صوتی) نشان داد که قسمت زیرین بخش آهکی مَند دسته رخساره‌های تراز بالای سکانس رسوبی رده سومی است که نهشته‌های دریای عمیق سازند سرگلو (باژوسین) تراز پیشرونده آن را ساخته‌اند. به‌همین ترتیب، لایه شیلی و واحد کربناته بالایی نیز دسته رخساره‌های یک سکانس رده سوم هستند که سطح حداکثر پیشروی آن معرف MFS J40 (کالووین میانی) در جنوب ایران است.
کلیدواژه‌ها

عنوان مقاله English

Sequence stratigraphy analysis of the Middle Jurassic Mand Limestone Member in southern Dezful Embayment, SW Iran

نویسندگان English

A. H. Jalilian 1
M. A. Kavoosi 2
1 Assist. Prof., Dept., of Geology, Payame Noor University, Tehran, Iran
2 National Iranian Oil Company Exploration Directorate, Tehran, Iran
چکیده English

The Mand Limestone Member (MLM) is an informal name of an index lithostratigraphic unit in the central and eastern regions of Zagros fold-thrust belt, where the boundary of Middle-Late Jurassic coincides with the top of this unit. To determine depositional environments and depositional sequences analysis of the MLM in the southern Dezful Embayment, we integrated the geological and geophysical data obtained from two drilled wells in Chahar Bisheh and Milatun oil fields. The MLM in the studied wells is about 125 to 142 m thick and consists of two clean carbonate units (low gamma-ray pick) separated by a shaly horizon. We conducted petrographic investigations on 80 thin sections from cuttings and cored intervals. Our studies indicate an abundance of peloid/intraclast and ooid grainstones as the dominant microfacies accompanied by lime mudstones and skeletal wackestones with common pieces of foraminifera, green algae, and sponge spicules. Our findings are also compatible with the deposition of the Mand Member in different sub-environments on a homoclinal ramp including the oolithic shoal, lagoon, and open marine. The combination of stratigraphic data together with the wireline logs (gamma-ray and sonic) is consistent with a sequence stratigraphic framework, in which the lower part of the MLM comprises the HST of a 3rd order depositional sequence. We placed the TST and maximum flooding surface (MFS) in the Sargelu deep marine facies (Bajocian). Accordingly, the MFS represents the Callovian MFS J40 of southern Iran.

کلیدواژه‌ها English

Sequence stratigraphy
Mand Member
Dezful Embayment
SW Iran
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  • تاریخ دریافت 29 مرداد 1403
  • تاریخ بازنگری 19 آبان 1403
  • تاریخ پذیرش 20 آبان 1403