چینه نگاری زیستی، چینه نگاری سکانسی و محیط رسوبی سازند های دالان و کنگان در میدان گازی لاوان در خلیج فارس، با تأکید بر مرز پرموتریاس

نوع مقاله: مقاله پژوهشی

نویسندگان

1 گروه زمین شناسی، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران، ایران

2 دانشکده زمین شناسی، دانشگاه تهران، تهران، ایران

3 گروه زمین شناسی، دانشگاه آزاد اسلامی، واحد تهران شمال

چکیده

برش تحت الارضی پرمو تریاس در چاه لاوان 3 از میدان گازی لاوان با 85 متر ضخامت شامل توالی هایی از سنگ آهک دولومیتی و دولواستون آهکی همراه با انیدریت برای بخش بالایی سازند دالان و 154 متر ضخامت شامل دولواستون و دولواستون آهکی با میان لایه هایی از انیدریت برای سازند کنگان می باشد. در این مطالعه 116 گونه متعلق به 55 جنس از روزنداران شناسایی شد که به زیست زون های Charliella altineri- Paraglobivalvulina mira- Dagmarita chanackchiensis Assemblage zone به سن جلفین (Dzhulfian) و Claraia aurita- Spirorbis phlyctaena Assemblage zone به سن آنیزین (Anisian) تقسیم شدند. در این مطالعه 9 میکروفاسیس اصلی برای بخش بالایی سازند دالان و 13 میکروفاسیس اصلی برای سازند کنگان با زیر محیط های سابخا، پهنه کشندی، لاگون، پشته های زیر دریایی و دریای باز که در یک پلاتفرم کربناته دریایی کم عمق بصورت رمپ هموکلینال نهشته شده اند، شناسایی گردید که بر پایه تغییرات رخساره ها و الگوی برانباشت عمودی، پیش نشینی و پس نشینی رسوبات و همچنین هم ارزی با پرتو گاما به دو سکانس رسوبی رده سوم برای بخش بالایی سازند دالان و دو سکانس رسوبی رده سوم برای سازند کنگان شامل بردو دسته رسوبی TST و HST قابل تقسیم است و میتوان آن را در مقیاس جهانی با بخش بالایی سوپرسکانس آبساروکا قابل قیاس دانست.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Biostratigraphy, sequence stratigraphy and depositional environment of Dalan and Kangan formations in Lavan Gas Field in Persian Gulf, with emphasis on Permian-Triassic boundary

نویسندگان [English]

  • Somayeh Baharlouei Yancheshmeh 1
  • Ebrahim Ghasemi Nejad 2
  • Hossain Rahimpour-Bonab 2
  • Seyyed Ali Aghanabati 3
1 Department of Geology, Science and Research Branch, Islamic Azad University, Tehran, Iran
2 School of Geology, Tehran university, Tehran, Iran
3 Department of Geology, Islamic Azad University, North Tehran Branch
چکیده [English]

Permo- Triassic subsurface section at Lavan 3 Well in Lavan Gas Field exhibits a 85 m-thick succession of limy dolostone and dolomitic limestone bearing anhydrite in the upper Dalan Formation, as well as a 154 m-thick succession of limy dolostone and dolostone with anhydrite intercalations in Kangan Formation. In the present study, 116 species belonging to 55 foraminifera genera were identified which were divided into two biozones, namely Charliella altineriParaglobivalvulina miraDagmarita chanackchiensis Assemblage zone (Dzhulfian in age) and Claraia auritaSpirorbis phlyctaena Assemblage zone (Anisian in age).  Nine primary microfacies were identified in the upper Dalan Formation, while, 13 microfacies were detected in Kangan Formation, together with different sub-environments (sabkha, tidal flat, lagoon, submarine ridge, and open marine) which were found to be deposited in a shallow marine carbonate platform in­ the form of a homoclinal ramp. Based on microfacies changes, aggradational, progradational and  retrogradational  stacking patterns of deposits and by conformation with the Gama-ray log, these strata could be divided into a couple of  third-order sedimentary sequences for the upper Dalan Formation, as well as a couple of third-orders for the Kangan Formation, including two system tracts (TST and HST). On a global scale, the findings are comparable to the upper part of the Absaroka supersequence.

کلیدواژه‌ها [English]

  • Biostratigraphy
  • Sequence Stratigraphy
  • Depositional environment
  • Dalan and Kangan formations
  • Lavan Gas Field

کتابنگاری

آقانباتی، ع.، 1383- زمین­شناسی ایران، سازمان زمین­شناسی و اکتشافات معدنی کشور، 586 ص.

بهارلوئی یانچشمه، س.، قاسمی­نژاد، ا.، رحیم‎پور بناب، ح.، آقانباتی، ع. و یوسف‎پور، م.، 1390- میکروبیواستراتیگرافی بخش بالایی سازند دالان و سازند کنگان بر اساس روزن­بران در چاه لاوان 3، حوضه خلیج فارس، پژوهش­های چینه نگاری و رسوب شناسی، سال بیست و هفتم، شماره پیاپی 45، شماره چهارم، صص. 1 تا 20.

طرهانی، ش.، رحیم‎پور بناب، ح.، پرتوآذر، ح.، شهریاری، ز.، 1385- بررسی چگونگی مرز پرموتریاس در میدان گازی پارس جنوبی، بیست و پنجمین گردهمایی علوم زمین.

کاووسی، م.، 1374- سنگ شناسی رسوبی، میکروفاسیس و محیط رسوبی سازند دالان در جنوب باختری ایران (کوه دنا)، پایان­نامه تحصیلی کارشناسی ارشد، گروه زمین­شناسی، دانشگاه آزاد اسلامی- واحد تهران شمال.

 

 

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