چينه نگاري زيستي، محيط رسوبي و چينه نگاري سکانسي سازند آسماري درچاه شماره 4 ميدان نفتي لب سفيد (شمال فرو افتادگي دزفول، جنوب غرب لرستان) و تنگ لنده (کوه سفيد، شمال غرب دهدشت)
محورهای موضوعی :صلاح الدین عرب پور 1 , علی صیرفیان 2 , علی رحمانی 3
1 - دانشگاه اصفهان
2 - دانشگاه اصفهان
3 - شرکت ملی نفت ایران
کلید واژه: ميکروفسيل هاي کف زي پلاتفرم کربناتي رمپ چينه نگاري سکانسي سازند آسماري ريزرخساره,
چکیده مقاله :
در اين مطالعه چينه نگاري زيستي، ريزرخساره ها، محيط رسوبي و چينه نگاري سکانسي سازند آسماري در چاه شماره 4 لب سفيد (شمال فروافتادگي دزفول، جنوب غرب لرستان) و تنگ لنده (کوه سفيد، شمال غرب دهدشت) مورد بررسي قرار گرفته است. سازند آسماري در برش لب سفيد 360 متر و دربرش تنگ لنده 260 متر ضخامت دارد و متشکل از آهک هاي ضخيم، متوسط تا نازک لايه است. تطابق زون هاي تجمعي تشخيص داده شده در نواحي مورد مطالعه با ساير نواحي زاگرس (تاقديس بنگستان: تنگ بند، تنگ ناياب و تنگ بوالفارس، ميدان نفتي پارسي، کوه آسماري و تاقديس خويز: تنگ بي بي نرجس)، حاکي از آن است که ته نشست سازند آسماري در تنگ بي بي نرجس، تنگ بند و چاه شماره 4 ميدان نفتي لب سفيد زود تر از ساير نواحي صورت گرفته است. بررسي ريزرخساره ها نشانگر آن است که سازند آسماري در چهار زيرمحيط رسوبي مختلف شامل پهنه جزرومدي، لاگون، پشته و درياي باز در يک پلاتفرم کربناتي از نوع رمپ نهشته شده است. بر طبق الگوهاي عميق و کم عمق شدگي ريزرخساره ها 5 سکانس درجه 3 در لب سفيد و دو سکانس درجه 3 در تنگ لنده، تشخيص داده شده است. جهت بررسي تغييرات حوضه رسوبي سازند آسماري در طي اليگوسن-ميوسن اين سکانس ها با سکانس هاي شناسايي شده در ساير نواحي زاگرس تطابق داده شده اند.
In this research biostratigraphy, microfacies, sedimentary environment and sequence stratigraphy of the Asmari Formation in well no.4 of Lab-e Safid (north of Dezful embayment, SW of Lurestan) and Tang- e Lendeh (Kuh-e Safid, NW of Dehdasht) has been studied. The total thickness of the Asmari Formation is 360 m and 260 m in the Lab-e Safid and Tang- e Lendeh sections, respectively and composed of thick, medium and thin bedded limestone. The correlation of recognized biozones in the studied regions with other regions in Zagros (Bangestan Anticline: tang-e Band, tang-e Nayab and Tang-e Bulfares, Parsi oil field, Kuh-Asmari and Khaviz Anticline: Tang-e Bibinarjes) indicates that Asmari Formatin in Tang-e Bibinarjes, Tang-e Band and, well no.4 of Lab-e Safid has deposited earlier than other regions. Four different sub environments were identified in the Asmari Formation based on microfacies analysis including tidal flat, lagoon, shoal, open marine. These depositional environments correspond to inner, middle and outer ramp. On the basis of deepening and shallowing patterns in the microfacies five and two third-order sequences have been recognized in the Lab-e Safid and Tang- e Lendeh sections, respectively. In order to study the changes of depositional environment of the Asmari Formation during the Oligocene-Miocene, the recognized sequences in this study have been correlated with those recognized in other parts of the Zagros basin.
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