مدل‌سازی فرآیند نفت‌زایی سنگ منشأ در مقاطع تراستی: مثالی از حوضه زاگرس

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشکده علوم، گروه زمین‌شناسی، دانشگاه فردوسی مشهد

2 پژوهشکده علوم زمین، واحد ژئوشیمی، پژوهشگاه صنعت نفت

چکیده

فرآیند نفت‌زایی موجب تولید نفت از مواد آلی سنگ‌ها در طی میلیون‌ها سال می‌شود. نفت تولید شده پس از مهاجرت، در سنگ مخزن جمع شده و یک تجمع یا میدان نفتی را تشکیل می‌دهد. در این مطالعه با استفاده از روش مدل‌سازی حوضه، تاریخچه حرارتی در یک مقطع تراستی شبیه‌سازی شده و تاریخچه هیدروکربن‌زایی سنگ‌های منشأ بررسی شده است. در این مقاله، با استفاده از داده‌های چینه‌شناسی، زمین شناسی و ژئوشیمیایی و به کمک نرم افزار مدل‌سازی یک بعدی، تاریخچه تدفین و نفت‌زایی ترسیم شده است. میزان پختگی مواد آلی سازندها، وضعیت پنجره نفت‌زایی و گاززایی و همچنین میزان کمی هیدروکربن‌زایی برای سنگ‌های منشأ پابده، کژدمی، گرو و سرگلو به‌دست آمده است. از داده‌های پختگی مواد آلی سازندها بر اساس انعکاس ویترینایت، جهت کنترل کیفی کار مدل‌سازی و اطمینان از درستی مدل، استفاده شده است. براساس این مطالعه، در مقطع تراستی، گسل موجب افزایش عمق و پختگی سنگ‌های منشأ و سرعت بخشیدن به فرآیند نفت‌زایی شده است. میزان تاثیر گسل تراستی هنگامی‌که سنگ منشأ به مرحله حداکثر نفت‌زایی نرسیده است، بیشتر خواهد بود. در صورتی که سنگ منشأ قبل از گسل خوردگی بخش عمده توان نفت‌زایی خود را از دست داده باشد، گسل تراستی تاثیری به مراتب کمتر در نفت‌زایی دارد.
 

کلیدواژه‌ها


عنوان مقاله [English]

Oil Generation Modeling from Source Rocks in Thrusted Sections: An Example from the Zagros Basin

نویسندگان [English]

  • Arsalan Zeinalzadeh 1
  • Seyed Reza Moussavi Harami 1
  • Mohammad Kassaie Najafi 2
  • Maryam Mirshahani 2
1 Department of Geochemistry, Faculty of Geoscience, (RIPI), Tehran
2 Department of Geochemistry, Faculty of Geoscience, (RIPI)
چکیده [English]

Oil generation is a long process of converting oil from organic matters, which takes millions of years. The generated oil migrates and accumulates in reservoir rock and is preserved as an oil accumulation or oil field. In this study, by using basin modeling method, thermal history in a thrusted section is simulated and the hydrocarbon generation history of source rocks is investigated. By means of stratigraphical, geological, and geochemistry data and using 1D basin modeling software, the burial and oil generation histories are reconstructed. In addition, organic matter maturity, oil and gas windows, and the quantity of hydrocarbon generation of Pabdeh, Kazhdumi, Garau, and Sargelu source rocks are obtained. The vitrinite reflectance data were used for the quality control of the model. Based on this study, the thrust fault has increased the depth and maturity of source rocks, and thereby the speed of the oil generation process. When the source rock is at the peak oil generation stage, thrust fault effect would be higher. If the source rock produces hydrocarbons before faulting and loses some potential, the thrust fault effect is far less
 

کلیدواژه‌ها [English]

  • 1D Basin Modeling
  • Oil Generation
  • Thrusted Sections
  • Zagros Belt
  • Source Rocks
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