نشریه علوم زمین خوارزمی

نشریه علوم زمین خوارزمی

بررسی گذر سازندهای پابده-آسماری بر اساس بررسی نانوفسیل های آهکی در یکی از چاه های میدان نفتی پارسی، فروافتادگی دزفول

نویسنده
دانشگاه بین المللی امام خمینی (ره)
چکیده
به‌منظور بررسی زیست‌چینه‌نگاری نانوفسیل­های آهکی، قسمت­های فوقانی سازند پابده و بخش تحتانی سازند آسماری در یکی از چاه­های میدان نفتی پارسی واقع در جنوب غرب ایران انتخاب شد. بررسی نانوفسیل­های آهکی دراین قسمت منجربه تشخیص16 جنس و 39 گونه شد. مطابق با اولین حضور گونه­های شاخص و گسترش تجمعات فسیلی همراه، چهار بیوزونHelicosphaera reticulate Zone (NP22/ Rupelian), Sphenolithus predistentus Zone (NP23/ Rupelian), Sphenolithus distentus Zone (NP24/ Rupelian-Chatian), Sphenolithus ciperoensis Zone (NP25/ Chatian) متعلق به بخش فوقانی سازند پابده که با زون­های CP16c تا CP19b مطابقت دارد، شناسایی شد. در نتیجه این پژوهش و بر اساس زون­های مشخص شده، سن بخش فوقانی سازند پابده روپلین تا شاتین تعیین شد. در بخش انیدریت قاعده­ای سازند آسماری، بیوزونی از نانوفسیل­های آهکی تعیین نشد. در این پژوهش شرایط حاکم بر حوضۀ رسوبی با حضور گونه­های شاخص از نانو­فسیل­های آهکی مشخص شد، به‌طوری‌که حضور این گونه­ها مؤید آب و هوای گرم و واقع شدن حوضه در عرض­های جغرافیایی پایین در زمان رسوب‌گذاری نهشته­ها است.


کلیدواژه‌ها

عنوان مقاله English

The study of Pabdeh-Asmari formations boundary based on calcareous nannofossil in one of the boreholes of Parsi Oil field, Dezful Embayment

نویسنده English

Saeedeh Senemari
Imam Khomeini International University, Qazvin, Iran
چکیده English

In order to study of calcareous nannofossils biostratigraphy, the upper part of the Pabdeh Formation and the lower parts of the Asmari Formation were selected in one well in Parsi oil field in southwest of Iran. Investigation of calcareous nanofossils in this section resulted in detection of 16 genera and 39 species. According to the first occurrence of index species and distribution of fossil assemblages, four biozones including Helicosphaera reticulate Zone (NP22/ Rupelian), Sphenolithus predistentus Zone (NP23/Rupelian), Sphenolithus distentus Zone (NP24/ Rupelian- Chatian) and Sphenolithus ciperoensis Zone (NP25/ Chatian), which is equivalent to zones CP16c - CP19b, was recognized in the upper part of the Pabdeh Formation. As a result of this study, and based on the identified calcareous nannofossil biozones, the age of the uppermost part of the Pabdeh Formation is Rupelian to Chatian. In the basal anhydrite portion of the Asmari Formation, no biozone of calcareous nanofossils was determined. In this study, the dominant conditions of the sedimentary environment, were determined by the presence of calcareous nannofossils index species, so that the presence of these species confirms the warm climate and basin location at low latitudes.

کلیدواژه‌ها English

Biozone
Biostratigraphy
Zagros
Calcareous nannofossils
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