بررسی فرآیند نفت‌زایی سنگ منشأ کژدمی در گستره ناحیه‌تغذیه میدان دارخوین در دشت‌آبادان

نوع مقاله: مقاله پژوهشی

نویسندگان

گروه زمین‌شناسی، دانشکده علوم، دانشگاه فردوسی مشهد، ایران

چکیده

سنگ‌های منشأ متعددی در دشت‌آبادان با سن ژوراسیک و کرتاسه وجود دارد مانند زون‌های غنی از ماده آلی در سازند کژدمی با سن آلبین که دارای پتانسیل تولید هیدروکربن است. این مطالعه جهت بررسی نقش هیدروکربن‌زایی سازند کژدمی در میدان دارخوین انجام‌شده و با استفاده از روش مدل‌سازی حوضه، فرآیند نفت‌زایی سازند کژدمی در بخش‌های با عمق تدفین حداقل و حداکثر در ناحیه‌تغذیه (kitchen area) میدان دارخوین بررسی شده و وضعیت نفت‌زایی مورد مقایسه قرار گرفته است. از داده‌های چاه حفاری شده در تاقدیس و چاه فرضی در عمیق‌ترین بخش ناحیه‌تغذیه جهت مدل‌سازی استفاده شده است. وضعیت نفت‌زایی سنگ منشأ کژدمی در دو موقعیت زمین‌شناسی با استفاده از نرم‌افزارهای مدل‌سازی حوضه بازسازی و تاریخچه‌حرارتی چاه‌های مورد مطالعه به‌دست‌آمده است. نتایج مدل‌سازی مورد بررسی قرار گرفته و تفاوت‌های تاریخچه فرآیند نفت‌زایی در چاه حفاری شده و بخش‌هایی از ناحیه‌تغذیه که به علت عمق زیاد امکان حفاری وجود ندارد، مورد بحث قرار گرفته است. نتایج این مطالعه نشان می‌دهد که در زمان حال، میزان دما، پختگی، نسبت تغییر و کمیت هیدروکربن‌زایی به سمت چاه فرضی افزایش می‌یابد. درحالی‌که در زمان گذشته زمین‌شناسی، وضعیت متفاوتی وجود داشته و سازند کژدمی در چاه فرضی میزان دما و پختگی کمتری داشته است. خروج هیدروکربن از سازند کژدمی در چاه حفاری شده از 20 میلیون سال پیش شروع شده و هنوز به پیک نفت‌زایی نرسیده است. این سنگ منشأ در چاه فرضی از پیک فرآیند نفت‌زایی گذشته و خروج هیدروکربن از 10 میلیون سال پیش شروع شده و میزان هیدروکربن‌زایی کژدمی تقریباً 75% بیش از تاقدیس است.
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of Hydrocarbon Generation Process for Kazhdumi Source Rock in Kitchen Area of Darquain Oil Field in the Abadan Plain

نویسندگان [English]

  • Arsalan Zeinalzadeh
  • Seyed Reza Mousavi Harami
  • Asadollah Mahboubi
Department of Geology, Faculty of Sciences, Ferdowsi University of Mashhad, Iran
چکیده [English]

There are several Jurassic and Cretaceous hydrocarbon source rocks in the Abadan Plain, including the organic-rich Albian Kazhdumi Formation which has a favorable geochemical characteristics for oil and gas generation. In this study, basin modeling used to investigate and compare petroleum generation from the Kazhdumi Formation of a well drilled on the Darquain anticline as well as a hypothetical constructed well for the deepest part of the kitchen area. The thermal history of the studied wells reconstructed using the basin modeling software and oil generation stage of the source rock were obtained. Modeling results have been investigated and differences in the history of the oil production processes in the drilled well and the deep part of the kitchen area are discussed. Results showed that temperature, maturity, transformation ratio, and hydrocarbon expulsion quantity increase from the anticline toward the hypothetical well. However, In the geological past, however, Kazhdumi temperature and maturity in the hypothetical well were less than anticline position. In the drilled well, hydrocarbon expulsion from Kazhdumi occurred from 20 Ma, and it is not reach to peak of oil generation stage. This source rock passed peak of oil generation in the hypothetical well area where the hydrocarbon expulsion occurred from 10 Ma, and expulsion quantity was about 75 percent more than anticline.
 

کلیدواژه‌ها [English]

  • Kazhdumi Source Rock
  • Darquain Oil Field
  • Basin Modeling
  • Burial History
  • Oil Generation

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