چینه شناسی سکانسی توالی های کربناتی- تبخیری سازند دشتک در چاه آغار 1 و آغار باختری 1 در میدان گازی آغار

نوع مقاله: مقاله پژوهشی

نویسندگان

1 گروه زمین شناسی، دانشکده علوم، دانشگاه بوعلی سینا، همدان، ایران.

2 گروه زمین‌شناسی، دانشکده علوم، دانشگاه بوعلی سینا، همدان، ایران.

3 اداره کل اکتشاف و تولید، شرکت ملی نفت ایران، تهران، ایران.

چکیده

سازند دشتک با رسوبات کربناتی- تبخیری یکی از پوش‌سنگ‌های مهم حوضه زاگرس است که در دو چاه (آغار#1 و آغار باختری#1) بررسی شده است. داده­های سنگ‌نگاری در این مطالعه به‌منظور چینه­شناسی سکانسی سازند دشتک از مقاطع نازک تهیه شده از خرده­های حفاری به‌همراه داده­های چاه­نگاری (گاما- صوتی) استفاده شده است. سازند دشتک متشکل از هشت کمربند رخساره­ای شامل رخساره­های پهنه ساحلی، پهنه فراکشندی، کشندی، لاگون، شول، دریای محدود، دریای باز و رمپ میانی است. در این سازند چهار سکانس رسوبی شناسایی شد که با دو مرز سکانسی نوع یک و سه مرز سکانسی نوع دو فرا گرفته شده­اند. سازند دشتک با محیط رمپ هموکلاین و تغییرات جانبی کم محیط رسوبی باعث شده است که تغییرات جانبی سکانس‌های سازند در ناحیه مورد مطالعه کم باشد.
 

کلیدواژه‌ها


عنوان مقاله [English]

Sequence Stratigraphy of Carbonate–Evaporite Successions of Dashtak Formation in Aghar#1and West Aghar#1 Boreholes in Aghar Gas Field

نویسندگان [English]

  • M. Khoshnoodkia 1
  • H. Mohseni 2
  • M. Hajian 3
1 Department of Geology, Faculty of Science, Bu-Ali Sina University, Hamedan, Iran.
2 Department of Geology, Faculty of Science, Bu-Ali Sina University, Hamedan, Iran.
3 Exploration and Production Office, National Iranian Oil Company, Tehran, Iran.
چکیده [English]

Carbonate – evaporates intervals of Dashtak formation is an important cap rocks in Zagros basin. Sequence stratigraphic analysis of Dashtak Formation in two wells (Aghar#1; West Aghar#1) was investigated in sequence stratigraphic framework. Data obtained from petrographic examinations of thin sections prepared from cuttings, in addition, a full suite of gamma ray and sonic logs were interpreted. Dashtak Formation comprises eight facies belts that are: (i) detrital clastics, (ii) supratidal, (iii) tidal flat, (iv) lagoon, (v) shoal, (vi) restricted marine, (vii) open marine, (viii) mid ramp. Dashtak Formation consists of four sequences with four transgressive, regressive and maximum flooding surfaces. Two sequence boundaries type I and three sequence boundaries type II were recognized in the Dashtak Formation. As far the depositional environment of the formation is interpreted as a homocline ramp with mild lateral changes in depositional environment, hence negligible lateral changes of stratigraphic sequences are expected in the study area.

کلیدواژه‌ها [English]

  • Dashtak Formation
  • Sequence Stratigraphy
  • Ramp
  • Aghar Gas Field
  • Costal Fars
کتابنگاری
حاجیان، م.، 1385- بررسی رخساره، محیط رسوبی و چینه‌شناسی سکانسی سازند دشتک (کوه سورمه، کوه سیاه#1، دالان#1 و دشتک#1) در ناحیه فارس. پایان‌نامه کارشناسی ارشد، دانشگاه آزاد اسلامی واحد تهران شمال. 117 صفحه.
فلاح خیر خواه، م.، 1385- مطالعه رخساره، محیط رسوبی و چینه‌شناسی سکانسی سازند خانه‌کت و دشتک در مقطع سطح‌الارضی دالانی (اشترانکوه) وچاه هلیلان#1 در منطقه زاگرس. پایان‌نامه کارشناسی ارشد، دانشگاه آزاد اسلامی واحد تهران شمال. 103 صفحه.
مطیعی، ه.، 1372- زمین‌شناسی ایران- چینه‌شناسی زاگرس: طرح تدوین کتاب زمین‌شناسی و اکتشافات معدنی کشور، 536 صفحه.
 
 
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