بررسي ساختار منافذ و خصوصيات فرکتال سنگ هاي کربناته ريز دانه‌ي گرو و سرگلو با استفاده از آناليز جذب در فشار پايين نيتروژن
الموضوعات :
سید علی معلمی
1
(پژوهشکده ازدیاد برداشت از مخازن نفت و گاز)
محمدابراهیم شبانی
2
(پژوهشگاه صنعت نفت)
هرمز قلاوند
3
(شرکت ملی نفت ایران)
زیبا زمانی پزوه
4
(پژوهشگاه صنعت نفت)
الکلمات المفتاحية: خصوصيات ساختاري جذب در فشار پايين نيتروژن حجم منافذ بعد فرکتال شيل گازي گرو و سرگلو,
ملخص المقالة :
در اين مطالعه خصوصيات منافذ نمونه‌هاي سنگ‌هاي کربناته ريزدانه در ايران، برروي 9 نمونه برداشت شده از سازندهاي گرو (5 نمونه) و سرگلو (4 نمونه) با استفاده از روش جذب در فشار پايين نيتروژن مورد ارزيابي قرار گرفت. ميزان کل کربن آلي موجود در نمونه‌هاي سازند گرو مابين wt% 64/0 تا wt% 21/5 (ميانگين wt% 2/3) و براي سازند سرگلو مابين wt% 12/0 تا wt% 94/10 (ميانگين wt% 3/4) متغير مي‌باشد. کاني کربناته بيشترين ميزان کاني (ميانگين wt% 64) موجود در نمونه‌هاي مطالعه شده در هر دو سازند گرو و سرگلو را شامل مي‌شود. بعد از کربنات‌ها، کوارتز (ميانگين wt% 15) و کاني‌هاي رسي(ميانگين wt% 9) قرار مي‌گيرند. حجم منافذ محاسبه شده مابين g100/3cm 6/0 و g100/3cm 5/2 با ميانگين g100/3cm 4/1 متغير است که مشابه تحقيقات انجام شده بروي شيل‌هاي گازي آمريکا مي‌باشد. يک رابطه‌ي خطي ميان ميزان کربن آلي و خصوصيات منافذ براي نمونه‌هاي هر دو سازند گرو و سرگلو مشاهده شد. به دليل تغييرات گسترده‌تر ميزان کل کربن آلي در سازند سرگلو نسبت به سازند گرو، اين رابطه خطي در سازند سرگلو مشهودتر مي‌باشد . بعد فرکتال بدست آمده براي نمونه‌هاي مطالعه شده مابين 45/2 و 81/2 و با ميانگين 64/2 متغير است. مقادير نسبتا بالاي بعد فرکتال بدست آمده نمايانگر ميزان بالاي ناهمواري و پيچيدگي در سطوح منافذ نمونه‌هاي شيلي گرو و سرگلو مي‌باشد. وجود رابطه‌ي مستقيم ميان ميزان ماده آلي و بعد فرکتال را مي‌توان به وجود ريزمنافذ در مواد آلي و در نتيجه ساختار ناهموار و پيچيده منافذ نسبت داد. براساس مشاهدات ميزان ماده آلي به عنوان مهمترين پارامتر کنترل کننده‌ي خصوصيات منافذ در نمونه‌هاي سازند گرو و سرگلو معرفي شد.
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