زمین شناسی کاربردی پیشرفته

زمین شناسی کاربردی پیشرفته

ویژگی‌های بیومارکری نفت مخزن آسماری در فروافتادگی دزفول، جنوب‌غربی زون راندگی زاگرس، ایران

نوع مقاله : مقاله پژوهشی

نویسندگان
1 گروه اکتشاف، دانشکده مهندسی معدن، دانشگاه صنعتی اصفهان، اصفهان، ایران
2 گروه زمین‌شناسی، دانشکده علوم، دانشگاه اصفهان، اصفهان، ایران
3 گروه ژئوشیمی آلی، پژوهشکده علوم زمین، پژوهشگاه صنعت نفت، تهران، ایران
چکیده
در این پژوهش ویژگی‌های ژئوشیمیایی نفت مخزن آسماری در فروافتادگی دزفول بر اساس شاخص‌های بیومارکری مورد بررسی قرار گرفت. نتایج نشان می‌دهد نفت میدان نرگسی دارای بیشترین اجزای اشباع و بالاترین کیفیت نسبت به سایر نمونه‌های نفتی مورد مطالعه است. بر اساس شاخص‌های بیومارکری شامل Pr/Ph، DBT/Phen، CPI، TAR، اولئینان و گاماسران، ایزوتوپ کربن آسفالتین، استران C27‌–C29، ترکیبات تری‌آروماتیک استروئید C26–C28، Pr/n-C17 و Ph/n-C18 و همچنین شاخص گاماسران در برابر Pr/Ph، تمامی نمونه‌ها دارای منشاء دریایی بوده و کروژن آن‌ها از نوعII است. بر اساس نمودار طبقه‌بندی نفت‌های خام، نمونه‌ها در گروه نفت‌های پارافینیک و پارافینیک- نفتنیک قرار می‌گیرند. شاخص‌های بلوغ شامل C29 ααα sterane 20S/(20S+20R)، C29 steraneββ/(αα+ββ)، Ts/(Ts+Tm)، CPI، نسبت هوموهوپان C32 22S/(22R+22S)، MDR و TAS (مجموع استروئیدهای تری‌آروماتیک) نشان‌دهنده بلوغ حرارتی بالا و قرارگیری نمونه‌ها در پنجره نفت‌زایی، تا مرحله اوج تولید نفت است؛ در این میان نفت میدان نرگسی بیشترین بلوغ را نشان می‌دهد. بر اساس نمودار DBT/Phen در برابر Pr/Ph، سنگ منشاء تمامی نمونه‌های نفتی مورد مطالعه دارای رخساره کربناته- مارنی است. همچنین، نمودار هوپان C29/C30 در برابر هوپان C35/C34 نشان می‌دهد که سنگ منشاء اکثر نمونه‌های نفتی از نوع کربناته- مارنی، در حالی که برخی نمونه‌ها از نوع کربناته- شیلی است. نتایج نمودار استران C28 در برابر استران C28/C29 سن احتمالی سنگ منشاء را عمدتاً کرتاسه آغازین تا ترشیاری نشان می‌دهد که با شاخص اولئینان و ایزوتوپ کربن آسفالتین همخوانی دارد.
کلیدواژه‌ها
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