نشریه علوم زمین خوارزمی

نشریه علوم زمین خوارزمی

پالئواکولوژی، ریز رخساره‌ها و محیط رسوب‌گذاری سازند سورگاه بر مبنای روزن بران پلانکتون در منطقه پلدختر استان لرستان

نویسندگان
محمد حدادی 1
محمد وحیدی نیا 1
محمد حسین محمودی قرائی 1
میثم شفیعی اردستانی 2
1 دانشگاه فردوسی مشهد، دانشکدۀ علوم، گروه زمین‌شناسی،
2 مؤسسه علم و صنعت مشهد
10.29252/gnf.5.2.175
چکیده
در این پژوهش پالئواکولوژی و محیط رسوب‌گذاری سازند سورگاه دریکی از چاه‌های میدان نفتی ماله‌کوه، به ضخامت 82 متر با لیتولوژی سنگ آهک رسی، آهک شیلی بامیان لایه‌هایی از سنگ آهک بررسی شده است. بر اساس بررسی روزن بران شناور، سن رسوبات مذکور انتهای تورونین میانی تا سانتونین پیشین تعیین شد. با بررسی آماری گروه‌های مورفوتایپ مربوط به دریاهای برقاره‌ای (ESF)، فرم‌های مربوط به آب‌های کم ژرف (SWF) و فرم‌های مربوط به مناطق ژرف (DWF) مشخص شد که قسمت اعظم فونای این سازند٬ جزو گروه مورفوتایپی مربوط به آب‌های مناطق ژرف و نشان‌دهندۀ شرایط خاص الیگوتروفی بوده است و هم‌چنین بالا بودن نسبت روزن بران شناور به کف‌زی مؤید رسوب‌گذاری در آب‌های نیمه‌عمیق تا عمیق در این زمان است. با بررسی فراوانی Whiteinella وMuricohedbergella ، میزان نوسانات شوری در چاه مذکور بررسی ‌شده و در محدودۀ انتهای تورونین تا ابتدای سانتونین آب دریا کم‌ترین میزان شوری را دارد. در نهایت 4 ریز رخساره شناسایی ‌شده و بر اساس جای‌گاه رخساره‌ای و زیستی روزن بران پلانکتون سازند مزبور در بخش‌های نیمه‌عمیق تا عمیق رمپ خارجی تا دریای باز گذاشته ‌شده است.


کلیدواژه‌ها
 میدان نفتی ماله کوه
سازند سورگاه
پالئواکولوژی
ریز رخساره
روزن بران شناور

عنوان مقاله English

Paleoecology, Microfacies and Depositional Environment of Surgah Formation based on Planktonic Foraminifera in Pol-e-Dokhtar district of Lorestan Province

نویسندگان English

mohamad hadadi 1
mohamad vahidinia 1
mohamad hosein mahmudy Gharaie 1
Meysam Shafiee Ardestani 2
1 Ferdowsi university of mashhad
2 Ferdowsi university of mashhad
چکیده English

In this research, paleoecology and depositional environment of Surgah Formation at the Maleh Kuh section have been investigated. The thickness of Surgah Formation is 82 meters and consists of argillaceous limestone, calcareous shales with intercalated limestones. Based on the planktonic foraminifera, the age of Surgah Formation at the study area is late middle Turonian to Early Santonian. Statistical studies of the morphotype groups of Epicantinental Sea Forms (ESF), Shallow Water Forms (SWF) and Deep Water Forms (DWF) show that these foraminifera are related to DWF, which indicate specific condition of oligotrophic. Also high planktonic/benthic foraminifera ratio confirms the semi deep to deep marine condition of sedimentary environment. The salinity as an ecological parameter in the section was changed to very low amount at the Late Turonian-Early Santonian based on abundance of Muricohedbergella and Whiteinella. Finally, four mirofacies have been identified based on stratigraphic and biostratigraphy position of planktonic foraminifera which formed in the semi deep to deep open marine. This microfacies belongs to the outer ramp of a carbonate platform.


کلیدواژه‌ها English

 Maleh Kuh Oil Field
Surgah Formation
Paleoecology
Microfacies
Planktonic Foraminifera
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