دوفصلنامه رسوب شناسی کاربردی

دوفصلنامه رسوب شناسی کاربردی

تلفیق مطالعات رخساره­ای، دیاژنزی و چینه ­نگاری سکانسی در بازسازی معماری چینه­ ای مخزن بنگستان میدان هنگام، شرق خلیج ­فارس

نویسنده
استادیار گروه اکتشاف نفت، دانشکده مهندسی معدن، دانشکدگان فنی، دانشگاه تهران، تهران، ایران
چکیده
سازندهای سروک و ایلام، سنگ­مخزن اصلی میدان هنگام در شرقی­ترین حد خلیج­فارس را تشکیل می­دهند. سازند سروک در این میدان با ضخامت متغیر، متشکل از سه عضو مدود، احمدی و میشریف است. آنالیز رخساره­ها در یکی از چاه­های مغزه­گیری شده در این میدان نشان می­دهد که عضو مدود (آلبین پسین) در یک پلت­فرم کربناتی متفاوت نسبت به عضو میشریف نهشته شده است. سازند ایلام نیز از سه رخساره حاوی فرامینیفرهای لاگونی، بیوکلستی و پلوییدی تشکیل شده است که در یک مجموعه شول و لاگون نهشته شده است. مطالعات پتروگرافی نشان می­دهد رخساره­های شناسایی شده بعد از رسوب­گذاری تحت تأثیر فرآیندهای دیاژنز دریایی، جوی و تدفینی قرار گرفته­اند. تأثیر و شدت فرآیندهای دیاژنزی جوی (انحلال و سیمانی­شدن) بر توسعه و توزیع تخلخل در بخش فوقانی عضو مدود، عضو میشریف و سازند ایلام اهمیت بیشتری داشته است. مطالعات چینه­نگاری سکانسی منجر به شناسایی چهار سکانس رسوبی رده سه در این سازندها شد که سکانس اول منطبق بر عضو مدود، سکانس­های دوم و سوم منطبق بر عضوهای احمدی و میشریف است که با یک ناپیوستگی چندین میلیون ساله از سکانس چهارم (سازند ایلام) تفکیک می­شود. سکانس رسوبی سوم تنها در چاه­های میانی میدان شناسایی شد و در چاه­های شمالی و جنوبی گسترش ندارد. نتایج مطالعات نشان می­دهد که طی رژیم فشارشی کرتاسه میانی و بالا­آمدگی بلوک­های گسلی، کل سکانس سوم و قسمتی از سکانس رسوبی دوم طی رخداد خروج از آب و فرسایش پس از سنومانین و سپس تورونین در چاه­های شمالی و جنوبی حذف و در چاه­های میانی حفظ شده است.
کلیدواژه‌ها

عنوان مقاله English

Integration of facies, diagenetic, and sequence stratigraphic studies in reconstructing the stratigraphic architecture of the Bangestan reservoir in the Hengam Field, eastern Persian Gulf

نویسنده English

B. Esrafili-Dizaji
Assist. Prof., Dept., of Petroleum Exploration, School of Mining Engineering, University of Tehran, Tehran, Iran
چکیده English

The Sarvak and Ilam formations constitute the main reservoir rocks of the Hengam Field at the easternmost part of the Persian Gulf. In this field, the Sarvak Formation exhibits variable thickness and comprises the Mauddud, Ahmadi, and Mishrif members. Facies analysis from one of the cored wells indicates that the Late Albian Mauddud Member was deposited in a carbonate platform different from the Mishrif member. The Ilam Formation consists of three facies, which were deposited in a shoal-lagoon complex. Petrographic studies reveal that the identified facies underwent post-depositional diagenetic processes, including marine, meteoric, and burial diagenesis. The impact and intensity of meteoric diagenesis played a significant role in porosity development and distribution in the upper part of the Mauddud and Mishrif members, and the Ilam Formation. Sequence stratigraphic analysis led to the identification of four third-order depositional sequences within this reservoir. The first depositional sequence corresponds to the Mauddud Member, while the second and third depositional sequences align with the Ahmadi and Mishrif members. The third depositional sequence is identified only in the central wells of the field, while it is absent in the northern and southern wells. The study results suggest that during the compressional regime of the mid-Cretaceous and the uplift of fault blocks, the entire third depositional sequence and part of the second depositional sequence were removed due to subaerial exposure and erosion following the post-Cenomanian to post-Turonian events in the northern and southern wells, whereas they were preserved in the central wells.

کلیدواژه‌ها English

Hengam Field
Sarvak formation
Ilam formation
Mauddud member
Ahmadi member
Mishrif member
Persian Gulf
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  • تاریخ دریافت 15 اسفند 1403
  • تاریخ بازنگری 28 مهر 1404
  • تاریخ پذیرش 30 مهر 1404