تأثیر تغییرات سنگ‌شناسی و پارامترهای پتروفیزیکی بر پتانسیل نفتی مخزن ایلام (کرتاسه بالایی)، در میدان نفتی اهواز، جنوب غرب ایران

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استاد، گروه زمین‎شناسی، دانشگاه شهید چمران اهواز، اهواز، ایران

2 کارشناسی ارشد، گروه زمین‎شناسی، دانشگاه شهید چمران، اهواز، ایران

3 کارشناسی ارشد، اداره نمودارگیری، شرکت ملی مناطق نفتخیر جنوب، اهواز، ایران

چکیده

بررسی نقش پارامترهای پتروفیزیکی و سنگ شناسی در ارزیابی پتانسیل نفتی مخزن ایلام (اواخر کرتاسه) در میدان نفتی اهواز از اهداف این مطالعه است. سازند ایلام از نظر سنگ‌شناسی متشکل از آهک، آهک دولومیتی و همچنین مقدار بسیار ناچیز شیل به‌صورت پراکنده است. تغییرات رخساره ای در طول سازند نیز مشاهده می شود. بر اساس توزیع اختصاصات پتروفیزیکی، این مخزن به چهار زون تقسیم شد. نتایج حاصل از بررسی داده های موجود نشان داد حجم شیل محاسبه ‌شده با استفاده لاگ های مربوط به پرتو گاما (CGR) به ‌عنوان شاخص شیل، کمتر از 10 درصد است و لذا مخزن ایلام به عنوان یک سازند تمیز محسوب می شود. بخش های 2 و 3 نسبت به بخش های 1 و 4 دارای شیل کمتری هستند. اگر چه حجم کانی های رسی بسیار کم است ولی تأثیر شدیدی بر پارامترهای پتروفیزیکی بخصوص تخلخل و تراوایی دارد. میانگین اشباع آب سازند ایلام 8/26 درصد و همچنین اشباع آب کاهش نیافتنی آن حدود 3/3 درصد تخمین زده شد. بخش میانی مخزن با اشباع آب کمتر نسبت به سایر بخش‌ها و میانگین تخلخل مؤثر حدود 7/14 درصد توصیف می شود. میانگین تراوایی محاسبه شده حدود 3/8 میلی دارسی است و تغییرات آن رابطه مستقیمی با تخلخل مفید نشان می دهد. همه این نتایج تأییدی بر این موضوع است که بخش  میانی سازند ایلام (زون 2 و 3) در مقایسه با بخش های دیگر (زون 1 و 4) دارای پتانسیل نفتی و ذخیره هیدروکربنی بالاتری است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effects of Lithological Variation and Petrophysical Parameters on Oil Potential of the Ilam Reservoir (Upper Cretaceous), Ahvaz Oil Field, SW Iran

نویسندگان [English]

  • B Soleimani 1
  • M. S. Ravanshad 2
  • Ehsan Larki 3
1 Professor, Department of Geology, Shahid Chamran University of Ahvaz, Ahvaz, Iran
2 M.Sc., Department of Geology, Shahid Chamran University of Ahvaz, Ahvaz, Iran
3 M.Sc., Well logging Section, National Iranian South Oil Company (NISOC), Ahvaz, Iran
چکیده [English]

Petrophysical and lithological parameters study of Ilam reservoir in Ahvaz oil field is the main aim of the present research work. Ilam Formation consisted lithologically of limestone, dolomitic limestone, and less quantity of scattered shales. Facies changes are also observed through the formation. On the basis of petrophysical parameters distribution the reservoir divided into 4 zones. The results indicated that shale volume calculated by CGR log, as a shale index, is less than 10% and so the Ilam reservoir is clean formation. Shale quantity is low in zones 2 and 3 than zones 1 and 4. However, the shale volume is very less but its effect on petrophysical parameters especially porosity and permeability is intense. The Ilam Formation is estimated to have 26.8 % water saturation and 3.3% of irreducible water saturation. Middle part is characterized by low rate of water saturation compared to other parts and along with effective porosity average in the range of 14.7%. Calculated permeability average is 8.3 mD. Permeability variation is indicating a direct relation with the porosity.  All these results are emphasized that the middle part (zones 2 and 3) is in better condition in view of oil potential and hydrocarbon reserve in comparing to other parts.

کلیدواژه‌ها [English]

  • Ahvaz oil field
  • Ilam Formation
  • Shale volume
  • Oil potential
  • Petrophysical parameters

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