سامانه مدیریت نشریات علمی دانشگاه شهید بهشتی

سعیدی رضوی, بهزاد, گنجی, علیرضا, ضرابی, سپهر. (1399). ریزرخساره‌ها، محیط رسوبی و پالئواکولوژی سازند آسماری در میدان نفتی کرنج، شمال فروافتادگی دزفول، جنوب غرب ایران. , 11(3), 35-52. doi: 10.52547/esrj.11.3.35
بهزاد سعیدی رضوی; علیرضا گنجی; سپهر ضرابی. "ریزرخساره‌ها، محیط رسوبی و پالئواکولوژی سازند آسماری در میدان نفتی کرنج، شمال فروافتادگی دزفول، جنوب غرب ایران". , 11, 3, 1399, 35-52. doi: 10.52547/esrj.11.3.35
سعیدی رضوی, بهزاد, گنجی, علیرضا, ضرابی, سپهر. (1399). 'ریزرخساره‌ها، محیط رسوبی و پالئواکولوژی سازند آسماری در میدان نفتی کرنج، شمال فروافتادگی دزفول، جنوب غرب ایران', , 11(3), pp. 35-52. doi: 10.52547/esrj.11.3.35
سعیدی رضوی, بهزاد, گنجی, علیرضا, ضرابی, سپهر. ریزرخساره‌ها، محیط رسوبی و پالئواکولوژی سازند آسماری در میدان نفتی کرنج، شمال فروافتادگی دزفول، جنوب غرب ایران. , 1399; 11(3): 35-52. doi: 10.52547/esrj.11.3.35

ریزرخساره‌ها، محیط رسوبی و پالئواکولوژی سازند آسماری در میدان نفتی کرنج، شمال فروافتادگی دزفول، جنوب غرب ایران

پژوهشهای دانش زمین
مقاله 3، دوره 11، شماره 3 - شماره پیاپی 43، 1399، صفحه 35-52    اصل مقاله (1.97 M)
نوع مقاله: مقاله پژوهشی
شناسه دیجیتال (DOI): 10.52547/esrj.11.3.35
نویسندگان
بهزاد سعیدی رضوی* 1؛ علیرضا گنجی2؛ سپهر ضرابی3
1گروه پژوهشی ساختمانی و معدنی، پژوهشکده فناوری و مهندسی، پژوهشگاه استاندارد، کرج، ایران
2گروه زمین‌شناسی، دانشکده علوم پایه، دانشگاه آزاد اسلامی، واحد لاهیجان، لاهیجان، ایران
3گروه زمین‌شناسی نفت، دانشکده علوم پایه، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران، تهران، ایران
چکیده
در این پژوهش ریزرخساره­ها، محیط رسوبی و پالئواکولوژی سازند آسماری با تکیه بر مطالعه 105 مقطع نازک (شامل مغزه­های حفاری) تهیه شده از 132 متر توالی­های برش تحت­الارضی یکی ازچاه­های میدان نفتی کرنج انجام شده است. 12 ریزرخساره شناسایی و تفسیر شد که شامل: 1) انیدریت، 2) مادستون-دولومادستون، 3) باندستون استروماتولیتی، 4) ماستون کوارتزدار، 5) بیوکلاستیک بنتیک فرامینیفرا (بدون منفذ) پکستون-گرین استون، 6) بنتیک فرامینیفرا (منفذ دار و بدون منفذ) وکستون-پکستون-گرین استون، 7) بایوکلاست گرینستون، 8) اُاُیید گرینستون، 9) کورالیناسه آ کورال فلوتستون، 10) لپیدوسیکلینا کورالیناسه آ نئوروتالیا پکستون-گرین استون، 11) لپیدوسیکلینا نومولیتیده پکستون-وکستون، 12) پلاژیک فرامینیفرا وکستون هستند، که می­توان به 5 محیط رسوبی شامل: پهنه جذر و مدی، لاگون محصور، لاگون نیمه محصور، دریای باز تقسیم کرد. به­طور کلی این رسوبات تحت 3 نوع متفاوت از شوری در دریایی باز(psu 40-34)، لاگون نیمه محصور (psu 50-45) و لاگون محصور (بیش از (psu 50 با زون نوری افوتیک، الیگوفوتیک، مزوفوتیک تا یوفوتیک و تحت 4 نوع رژیم غذایی: الیگوتروفی، مزوتروفی، یوتروفی و هایپرتروفی در یک پلاتفرم کربناته از نوع رمپ هموکلینال در زمان چاتین تا بوردیگالین رسوب­گذاری نموده است.
کلیدواژه‌ها
پالئواکولوژی؛ ریزرخساره‌ها؛ سازند آسماری؛ محیط رسوبی؛ میدان نفتی کرنج
عنوان مقاله [English]
Microfacies, depositional environment and paleoecology of the Asmari Formation in the Karanj oil field, norhtern Dezful embayment, SW Iran
نویسندگان [English]
Behzad Saeedi Razavi1؛ Alierza Ganji2؛ Sepehr Zarrabi3
1Department of Construction and Mineral Engineering, Technology and Engineering Research Center, Standard Research Institute (SRI), Karaj, Iran
2Department of Geology, Faculty of Basic Sciences, Islamic Azad University, Lahijan, Iran
3Department of Petroleum Geology, Faculty of Basic Sciences, Islamic Azad University, Tehran University of Science and Research, Tehran, Iran
چکیده [English]
Introduction
The Asmari Formation (Oligo-Miocene) is spread in the Zagros region. The Formation was first
identified in Tang-Gel-Torsh, located on Mount Asmari. In a sample type section, the thickness of this
formation is 314 meters. Kranj oil field is one of the most important oil fields in the North of the
restricted embayment of Dezful. The Karanj anticline structure, one of the most important oil fields in
Iran, is located in the southwest of the Zagros sedimentary basin and in the southern part of the north
of restricted Dezful embayment adjacent to the Persian fields.
Materials and Methods
The study section is located 115 km east of Ahvaz. In this study, 105 thin sections of core drilling,
belonging to Asmari Formation wells, were prepared in Karanj oil field. They were prepared with the
help of a microscope equipped with a camera and carefully examined in lithology and fossiles studies.
In the study of microfacies, the naming of limestones was done by Dunham and Amberi and Calvan
methods and the identification of microfacies was based on the Flogel model. Asmari Formation is 132
meters thick in this well.
Results and Discussion
In this study, microfacies, depositional environment and paleoecology of Asmari Formation have been
performed based on the study of 105 thin sections (including Core drilling) prepared from 132 m of
subsurface cutting sequences from one of the wells of Karanj oil field.
12 microfacies related to the environments, tidal flat, lagoon, shoal and open marine were identified
and interpreted, including: 1) Anhydrite, 2) Mudstone-Dolomudstone, 3) Stromatolitic boundstone, 4)
Quartz mudstone, 5) Bioclastic benthic foraminifera (perforate and imperforate) packstone-grainstone,
6) Benthic foraminifera (perforate) wackestone-packstone-grainstone, 7) Bioclastic grainstone, 8) Ooid
grainstone, 9) Corallinacean coral floatstone, 10) Lepidocyclina corallinacean Neorotalia packstonegrainstone,
11) Lepidocyclina Nummulitids wackestone-packstone, 12) planktonic foraminifera
wackestone, which can be grouped into five depositional environments: tidal flat, restricted lagoon,
open lagoon, shoal and open marine.
Investigating the important factors in the distribution of large benthic Foraminifera in this well
The following factors play a role in the distribution of large benthic Foraminifera in the study period:
Salinity, Distribution of food, Temperature, Water mobility, Water depth, Light.
Conclusion
In deposits of Asmari Formation in this well in Karanj oil field, aging from chattian to Burdigalin, with
132 meters in thickness, 12 microfacies were identified. The microfacies identified in this section
belong to four ancient environments, including the tidal flat, lagoon, shoal, and open marine. Based on
these microfacies and how to expand them, a hemoclinical ramp is recommended for sedimentation of
this Formation. .Based on the presence of benthic and other components of sediments and how they are
distributed in the carbonate platform, these sediments were formed with normal salinity in aphoic,
oligophic and oligophic to mesophotic zones and under low nutritional (oligotrophy) and medium
(mesotrophy) food conditions in chatian age. In Aquitanian-Burdigalian age, in the study section, high
salinity conditions in the uphotic zone with high (uphotic) feeding conditions were present. Within the
studied profile, the Asmari Formation was deposited during the Chattian period in the open marine with
normal salinity (Psu 40-34) in the aphotic, oligophic to mesophotic light zone, and under the
oligotrophic to mesotrophic nutrient. At the time of Aquitanian to Burdigalian, it was deposited in a
restricted lagoon environment with a psu 50-45 salinity and in an open lagoon with a salinity of more
than 50 psu, in the uphotic light zone, under a uphoty nutrient.
کلیدواژه‌ها [English]
Paleoecology, Microfacies, Asmari Formation, Depositional environment, Karanj oil field
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