ارزیابی محیط رسوبی و کیفیت مخزنی سازند بورگان در یکی از میادین نفتی ناحیه دشت آبادان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی نفت، پردیس علوم و فناوری های نوین، دانشگاه سمنان، سمنان، ایران

2 دانشکده مهندسی شیمی، نفت و گاز، دانشگاه سمنان، سمنان، ایران

3 گروه زمین شناسی، دانشکده علوم زمین، دانشگاه خوارزمی، تهران، ایران

4 شرکت مهندسی و توسعه نفت، تهران، ایران

چکیده

سازند کژدمی به سن کرتاسه میانی می باشد که قاعده آن در ناحیه دشت آبادان دارای ترکیب سنگ شناسی ماسه سنگ، شیل و سنگ آهک و معادل سازند بورگان در کشورهای عربی است. با توجه به مطالعات پتروگرافی 4 ریزرخساره رسوبی و 5 رخساره سنگی در سازند بورگان شناسایی شد که در محیط رمپ کربناتی به سمت دلتا نهشته شده است. از جمله فرآیندهای دیاژنزی می توان به انحلال، شکستگی، سیمانی شدن، دولومیتی شدن، تراکم، گلاکونیتی شدن، هماتیتی شدن و پیریتی شدن اشاره کرد که در سه محیط دریایی، متئوریک و تدفینی به وقوع پیوسته اند. از میان فرآیندهای دیاژنزی انحلال و شکستگی نقش ویژه ای در افزایش کیفیت مخزنی داشته اند و سیمانی شدن، دولومیتی شدن و تراکم مهمترین عوامل کاهش کیفیت مخزنی سازند مورد مطالعه بوده اند. مطالعات مغزه و نمودارهای چاه پیمایی نشان می دهند که رخساره ماسه سنگی و کربناتی به ترتیب بیشترین و کمترین مقدار تخلخل، تراوایی و آغشتگی به هیدروکربور را داشته اند و رخساره شیلی از لحاظ کیفیت مخزنی در میان این دو رخساره قرار گرفته است. رخساره سنگی کوارتز آرنایت به عنوان زون اصلی مخزنی در میدان نفتی مورد مطالعه شناسایی شد.

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