نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زمین شناسی، دانشکده علوم، واحد علوم و تحقیقات تهران، دانشگاه آزاد اسلامی، تهران، ایران

2 گروه‌زمین شناسی،‌ دانشکده‌علوم‌زمین، دانشگاه‌ دامغان،‌ دامغان،‌ ایران

چکیده

شناسایی سطوح کلیدی چینه نگاری سکانسی، از بخش های مهم سرشت نمایی زمین شناسی مخازن هیدروکربنی است.  توالی های کربناته بخش منیفا و سازند فهلیان با سن ژوراسیک بالایی-کرتاسه زیرین، مخازن هیدروکربنی مهمی در بخش شمال باختری خلیج فارس به‌شمار می روند. در این مطالعه، کارآیی نمودار D-INPEFA گاما در شناسایی و تفکیک سکانس ها و سطوح کلیدی سکانسی در پنچ چاه کلیدی در یکی از میادین نفتی خلیج فارس بررسی شده است. به این منظور، سطوح کلیدی سکانسی تفکیک شده بر اساس توصیف مغزه ها و بررسی مقاطع نازک میکروسکوپی، با نتایج تفسیر نمودار D-INPEFA گاما مقایسه شده است.  از دیدگاه چینه نگاری سکانسی و  با توجه به نتایج مطالعات زمین شناسی، چهار سکانس رده سوم در توالی تیتونین بالایی-نئوکومین شناسایی و توصیف گردید. مرز سکانسی رأس بخش منیفا به عنوان یک ناپیوستگی مهم توسط شواهد کارستی شدن و تغییرات گسترده رخساره ای در مرز زیرین و بالایی مشخص می شود.  مقایسه سکانس ها با سطوح کلیدی تفکیک شده از طریق نمودار D-INPEFA گاما، نشان می دهد که این روش می تواند به صورت کارآمد در شناسایی و انطباق سکانس ها در محدوده یک میدان هیدروکربنی به‌کاربرده شود.  

کلیدواژه‌ها

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