تخمین تراکم شکستگی در مخازن کربناته با استفاده از آنالیز داده XMAC ، STAR و VDL : مطالعه موردی مخزن آسماری میدان آغاجاری، جنوب غرب ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زمین شناسی نفت و حوضه های رسوبی، دانشکده علوم زمین، دانشگاه شهید چمران اهواز، اهواز، ایران

2 گروه زمین شناسی، دانشکده علوم زمین، دانشگاه شهید چمران اهواز، اهواز، ایران

چکیده

تعیین فواصل دارای تراکم شکستگی در مخازن کربناته نقش مهمی در مدیریت هزینه، افزایش بهره وری و توسعه میدان از این مناطق را بازی می کند. مطالعه مغزه ها و نمودارهای تصویرگر از روشهای مستقیم و متداول مطالعه شکستگی‌ها در فواصل مخزنی به صورت یک داده پیوسته است. در این مطالعه از ابزار XMAC جهت تعیین محل قرارگیری و همچنین ارزیابی شکستگیهای سازند مستعد شکستگی آسماری استفاده گردیده است. این ابزار با اندازه گیری و آنالیز امواج استونلی در محیط نرم افزار Geolog 8 قابلیت ارزیابی و آشکارسازی شکستگیها را بصورت پیوسته انجام می‌دهد. پس از پردازش داده ها و اعمال فیلترهای مختلف جهت بهبود امواج دریافتی، ضریب انعکاسی (RC) با کسر امواج مستقیم و انعکاسی (بصورت دو نوع موج Up و Down) از موج اولیه محاسبه گردید که خود تابعی از محل قرارگیری و تراکم شکستگی‌ها می باشد. بمنظور صحت سنجی، نتایج مطالعه با اطلاعات نمودار تصویرگر STAR و همچنین نمودار VDL (مشتق از داده های پتروفیزیکی) به ترتیب به عنوان دو روش مستقیم و غیر مستقیم در ارزیابی شکستگی‌ها مقایسه گردید. نتایج حاصل از مطالعه در بیشتر زونها بیانگر تطابق بسیار خوب فاکتور ضریب انعکاس با تراکم شکستگیهای حاصل از تفسیر نمودار تصویرگر بوده مشروط بر آنکه فواصل دارای تغییرات لایه بندی و همچنین ریزشهای دیواره چاه شناسایی و تعیین گردند. این روش در میادین هدف که کسب داده از روشهای مستقیم مطالعه نمودارهای تصویرگر و مغزه امکانپذیر نیست، کاربردی و پیشنهاد می‌گردد.

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