محیط رسوبی، دیاژنز و کیفیت مخزنی سازند سروک (بخش بالایی) در میدان نفتی سیری اسفند

نوع مقاله: مقاله پژوهشی

نویسندگان

1 گروه زمین‌شناسی، واحد علوم و تحقیقات دانشگاه آزاد اسلامی، تهران

2 دانشکده زمین‌شناسی، پردیس علوم، دانشگاه تهران

3 پژوهشگاه صنعت نفت پردیس پژوهش و توسعه صنایع بالادستی، تهران

چکیده

سازند سروک (آلبین- تورونین) یکی از مخازن مهم نفت و گاز در میادین نفتی جنوب و جنوب‌غرب ایران بعد از سازند آسماری ( الیگو- میوسن) است که بخش قابل توجهی از ذخایر هیدروکربنی را در خود جای داده‌است. بررسی مقاطع نازک میکروسکوپی این سازند در میدان مورد مطالعه در جنوب شرقی خلیج‌فارس منجر به شناسایی 9 رخساره‌ شد که در 4 زیر‌محیط رخساره‌ای  قرار‌می‌گیرند و در یک رمپ‌کربناته هموکلینال نهشته شده‌اند. فرآیند‌های دیاژنزی مهمی که کربنات‌های این سازند را تحت‌تأثیر قرار‌‌داده‌اند شامل نئومورفیسم، آشفتگی‌زیستی، میکرایتی‌شدن، دولومیتی‌شدن، انحلال گسترده، سیمانی‌شدن، استیلولیتی‌شدن و شکستگی می‌باشند. فرآیند‌های دیاژنزی شناخته‌شده در سنگ‌ آهک های بخش بالایی سازند سروک و بررسی زمان نسبی تشکیل آنها حاکی از آن است که این فرآیندها در سه محیط اصلی دیاژنزی دریایی، جوی و دفنی رخ‌داده‌اند. تطابق داده‌های تخلخل و تراوایی مغزه ها نشان دهنده این است که کیفیت مخزنی سازند سروک‌بالایی در میادین مورد مطالعه متأثر از رخساره‌ها، محیط‌رسوبی و عوامل دیاژنزی بعدی بوده‌است. به طوری که رخساره‌های رودیستی ( گرینستون، رودستون و فلوتستون) دارای بالاترین میزان تخلخل و تراوایی هستند.
 

کلیدواژه‌ها


عنوان مقاله [English]

Sedimentary Environment, Diagenesis, and Reservoir Quality of Sarvak Formation (Upper Part) in Siri (E) Oilfields

نویسندگان [English]

  • Nayyer Shahverdi 1
  • Hossain Rahimpour Bonab 2
  • Mohammad Reza Kamali 3
1 Department of Geology, Science and Research Branch, Islamic Azad University (IAU), Tehran
2 School of Geology, College of Science, University of Tehran
3 Research Institute of Petroleum Industry, Tehran
چکیده [English]

The Sarvak formation (Late-Albian-middle Turonian) is one of the main oil and gas reservoir units in the southern and southwest of Iran after Asmari formation (Oligo-Miocene). It hosts an important amount of hydrocarbon reserves in this region. Detailed thin section studies of this formation in the Siri field led to the identification of 9 major microfacies, which are deposited in four facies belts (basin, outer-ramp, mid ramp, and inner ramp) in a homoclinal ramp-type platform. Main diagenetic processes affecTed carbonate of this formation are neomorphism, bioturbation, micritization, dolomitization, extensive dissolution, cementation, stylolitization, and fracturing. Diagenetic processes at the upper part of the Sarvak formation and the relative timing indicate that these processes occur in three main diagenetic environments, including marine, meteoric, and burial. The correlation between the porosity and permeability values of core data shows that the reservoir quality is affected by sedimentary environment, sedimentary facies, and subsequent diagenetic processes. Thus the rudists facies (grainstone, rudstone, and floatstone) have a maximum porosity and permeability
 

کلیدواژه‌ها [English]

  • Sarvak Formation
  • Sriri (E) Oilfield
  • Sedimentary Environment
  • Diagenesis
  • Reservoir Quality

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