دوفصلنامه رسوب شناسی کاربردی

دوفصلنامه رسوب شناسی کاربردی

کنترل رخساره‌های رسوبی بر توزیع تخلخل و تراوایی در سازندهای دالان بالایی و کنگان در یکی از میادین شرق خلیج ­فارس

نویسندگان
1 دانشجوی کارشناسی‌ارشد، دانشکده زمین‌شناسی، دانشکدگان علوم، دانشگاه تهران، تهران، ایران
2 دانشیار دانشکده زمین‌شناسی، دانشکدگان علوم، دانشگاه تهران، تهران، ایران
3 استادیار دانشکده زمین‌شناسی، دانشکدگان علوم، دانشگاه تهران، تهران، ایران
چکیده
توالی‌های رسوبی پرمین- تریاس در خلیج­فارس میزبان بزرگ­ترین ذخایر گازی جهان می‌باشند. توزیع خصوصیات مخزنی در این مخازن به میزان چشمگیری تحت کنترل عوامل رسوبی (اولیه) نظیر تغییرات بافتی، سنگ‌شناختی و رخساره‌ای می‌باشد. مطالعه حاضر، با تلفیق داده‌های مختلف پتروگرافی مغزه و مقاطع نازک همراه با داده‌های تخلخل و تراوایی به دست آمده از آنالیز مغزه‌های حفاری در یک چاه از یکی از میادین ناحیه شرقی خلیج­فارس، کنترل این عوامل بر توزیع تخلخل و تراوایی در واحدهای مخزنی K1 تا K3 سازندهای دالان بالایی و کنگان را ارزیابی می‌نماید. مطالعات رخساره‌ای منجر به شناسایی تعداد ۱۳ ریزرخساره گردیده که در پنج کمربند رخساره‌ای قرار می‌گیرند و معرف یک پلاتفرم رسوبی از نوع رمپ هم‌شیب می‌باشند. تحلیل فراوانی بافت‌های رسوبی، تغییرات سنگ‌شناختی و ریزرخساره‌های رسوبی از دیدگاه توزیع داده‌های تخلخل و تراوایی حاکی از ارتباطات زیادی بین آن‌ها است. بخش قابل­توجهی از این ارتباطات به دلیل حفظ پتانسیل مخزنی رخساره‌ها طی فرآیندهای دیاژنزی بوده و نیز بسیاری از فرآیندهای دیاژنزی رخ داده در این سازندها، به طور مستقیم یا غیرمستقیم تابع خصوصیات بافتی و رخساره‌ای بوده‌اند. سنگ‌های دولومیتی یا دولومیت‌دار و رخساره شول که تشکیل‌دهنده حدود نیمی از توالی‌های مورد مطالعه هستند، بهترین وضعیت مخزنی را نشان می‌دهند. رخساره‌های دانه‌‌پشتیبان گرینستون حاوی آنکویید، پلویید و اجزای اسکلتی محیط پشت شول بهترین وضعیت تخلخل را نشان می‌دهند و حفرات بین‌دانه‌ای و قالبی غالب‌ترین نوع منافذ در این رخساره می‌باشد. بالاترین میزان تراوایی مرتبط با رخساره گل‌پشتیبان دولومادستون می‌باشد که حفرات بین‌بلوری، نوع منفذی غالب در آن است.
کلیدواژه‌ها

عنوان مقاله English

Controls of depositional facies on porosity–permeability distribution in the Upper Dalan and Kangan formations in a field in the eastern Persian Gulf

نویسندگان English

S. Karami 1
V. Tavakoli 2
H. Mehrabi 3
1 M. Sc., student. School of Geology, College of Science, University of Tehran, Tehran, Iran
2 Assoc. Prof., School of Geology, College of Science, University of Tehran, Tehran, Iran
3 Assist. Prof., School of Geology, College of Science, University of Tehran, Tehran, Iran
چکیده English

The Permian-Triassic sedimentary sequences in the Persian Gulf host some of the world's largest gas reserves. The distribution of reservoir properties in these reservoirs is significantly controlled by sedimentary (primary) factors such as textural, lithological, and facies variations. This study, by integrating various petrographic data from core samples and thin sections, along with porosity and permeability data obtained from core analyses of a well in one of the eastern fields of the Persian Gulf, aims to evaluate the control of these factors on the distribution of porosity and permeability in reservoir units K1 to K3 of the Upper Dalan and Kangan formations. Facies analysis led to the identification of 13 microfacies, which grouped into five facies belts, representing a homoclinal ramp-type carbonate platform. The analysis of sedimentary textures, lithological variations, and sedimentary microfacies from the perspective of porosity and permeability distribution data indicates a close correlation between them. A significant portion of these correlations is due to the preservation of reservoir potential in the facies, and many diagenetic processes are directly or indirectly influenced by textural and facies characteristics. Dolomitic or dolomite-bearing rocks with shoal facies, which made up about half of the studied sequences, exhibit the best reservoir quality. Grain-supported grainstone facies containing ooids, peloids, and skeletal fragments from the back-shoal environment show the best porosity, with intergranular and moldic pores being the dominant types in these facies. The highest permeability is associated with mud-supported dolomudstone facies, where intercrystalline pores are the dominant type.

کلیدواژه‌ها English

Reservoir quality
Sedimentary environment
Permian-Triassic
Dolomitization
Carbonate Ramp
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  • تاریخ دریافت 02 مهر 1403
  • تاریخ بازنگری 15 آذر 1403
  • تاریخ پذیرش 18 آذر 1403