پتروگرافی، محیط رسوبی و چینه نگاری سکانسی سازند تله زنگ در میدان نفتی لب سفید جنوب غربی ایران

نویسندگان

1 دانشیار گروه زمین‌شناسی، دانشگاه آزاد اسلامی، واحد استهبان، استهبان، ایران

2 شرکت ملی مناطق نفت‌خیز جنوب، اهواز، ایران

چکیده

به‌منظور مطالعه رخساره‌های میکروسکوپی، فرایندهای دیاژنتیکی، محیط­رسوبی و چینه­نگاری سکانسی سازند تله­زنگ در میدان نفتی لب سفید تعداد 2 چاه (شماره 1 و 5) از این میدان مورد تجزیه‌وتحلیل قرار گرفت. بر اساس مطالعه 250 مقطع نازک تهیه ‌شده از خرده‌های حفاری تعداد 8 ریزرخساره شناسایی گردید که در یک رمپ کربناته هم‌شیب در بخش‌های لاگون و دریای باز رسوب‌گذاری شده‌اند. در مقیاس بزرگ‌تر و در نظر گرفتن هم­ارزی چینه­شناختی رسوبات پالئوسن- ائوسن در منطقه مورد مطالعه می‌توان یک محیط رسوبی شلف کربناته را نیز برای سازند تله­زنگ پیشنهاد داد. فرایندهای دیاژنزی عمده که بر روی سازند تله­زنگ تأثیرگذار بوده‌اند شامل میکرایتی شدن، نوشکلی، دولومیتی شدن، انحلال، سیمانی شدن، فشردگی، پیریتی شدن، هماتیتی شدن و شکستگی هستند. فرایندهای دیاژنتیکی شناسایی‌ شده محصول دیاژنز کم‌ژرفای دریایی تا عمیق دفنی هستند. با توجه به تغییرات سنگ‌شناسی، تغییرات لاگ گاما، تغییرات عمودی ریزرخساره‌ها چینه­نگاری سکانسی سازند تله­زنگ در چاه شماره 1 میدان مورد مطالعه مورد ارزیابی قرار گرفت و تعداد 1 سکانس رسوبی درجه سوم کامل تشخیص داده شد. در چاه شماره 5 یک سکانس رسوبی درجه سوم مشترک با سازند پابده تشخیص داده شد به‌طوری‌که دسته رخساره بسته رسوبی TST رخساره پلاژیک سازند پابده با مقادیر بالای لاگ گاما و مقاومت الکتریکی پایین و دسته رخساره بسته رسوبی HST آهک‌های نازک تا ضخیم لایه سازند تله­زنگ با مقادیر متوسط تا پایین لاگ گاما و مقاومت الکتریکی متوسط تا بالا را شامل می‌شود. به‌طورکلی سیستم تراکت تراز پیشرونده در توالی مورد مطالعه با افزایش کمی مقدار لاگ گاما در سکانس و سیستم تراکت ترازبالا در طول ضخامت سکانس رسوبی تفکیک ‌شده با کاهش و یا ثابت ماندن مقادیر لاگ گاما مشخص می‌شود. نکته مهم در مورد این سیستم تراکت هم­ارزی این سیستم تراکت با افزایش پتانسیل مخزنی در طول مخزن است. گسترش رخساره‌های دانه­پشتیبان متأثر از محیط رسوب‌گذاری و فرایندهای دیاژنتیکی از قبیل انحلال، دولومیتی شدن و شکستگی‌ها از عوامل بالا بودن پتانسیل مخزنی در دسته رخساره‌های HST است.

کلیدواژه‌ها

عنوان مقاله [English]

Petrography, sedimentary environment, and sequence stratigraphy of Tale-Zang oilfield in Southwest Iran

نویسندگان [English]

  • R. Mirzaee Mahmoodabadi 1
  • A. Armoon 2
1 Assoc. Prof., Dept., of Geology, Islamic Azad University, Estahban Branch, Estahban, Iran
2 National Iranian South Oil Company (NISOC), Ahvaz, Iran
چکیده [English]

In order to study microfacies, diagenetic processes, sedimentary environment, and sequence stratigraphy of the Tele Zang Formation in the Lab Sefid oil field, two wells (No. 1 and 5) were analyzed. Based on the study of 250 thin sections prepared from cuttings, 8 microfacies were identified and deposited in an homoclinal carbonate ramp. On a larger scale and considering the stratigraphic equivalence of the Paleocene-Eocene sediments in the studied area, a carbonate shelf sedimentary environment can also be proposed for the Tele Zang Formation. The major diagenesis processes that have affected the Tel Zang Formation include micritization, neomorphism, dolomitization, dissolution, cementation, compaction, pyritization, hematitization, and fracture. The identified diagenetic processes are the product of shallow marine to deep marine diagenesis. According to lithological changes, gamma log changes, and vertical changes of microfacies, the sequence stratigraphy of Tele Zang formation in well No. 1 of the studied field was evaluated, and one complete third depositional sequence was recognized. In well number 5, a typical third depositional sequence with Pabdeh Formation was detected, such that the closed sedimentary facies group TST is the pelagic facies of Pabdeh Formation with high gamma log values and low resistivity and the closed sedimentary facies group HST is thin to thick limestone layers of the formation. It includes bell traps with low log gamma values and medium to high resistivity. In general, the transgressive systems tract in the studied sequence is characterized by a slight increase in the log gamma value in the sequence, and a decrease or constant log gamma values characterize the highstand systems tract during the thickness of the segregated depositional sequence. The critical point about this systems tract is the equivalence of this systems tract with the increase of reservoir potential along the length of the reservoir. The expansion of the supporting grain facies affected by the depositional environment and diagenetic processes such as dissolution, dolomitization, and fractures is one factor in the high reservoir potential in the HST facies category.

کلیدواژه‌ها [English]

  • Microfacies
  • Diagenetic
  • Sedimentary Environment
  • Tale-Zang Formation
  • Lab Sefid oil field

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  • تاریخ دریافت: 23 خرداد 1402
  • تاریخ بازنگری: 24 مرداد 1402
  • تاریخ پذیرش: 25 مرداد 1402

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