تحلیل شکستگی‌های ساختارهای مخزنی مؤثر بر ناپایداری چاه‌های اکتشافی ـ توسعه‌ای نفت در فروبار دزفول، زاگرس چین‌خورده

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشگاه بیرجند

2 هیات علمی دانشگاه بیرجند

3 هیات علمی دانشگاه تربیت مدرس

چکیده

در این مطالعه اثر شکستگی‌ها بر تاقدیس‌ها که از مهم‌ترین عوامل ناپایداری چاه‌های مخازن هیدروکربوری در سازند آسماری واقع در فروبار دزفول زاگرس چین‌خورده، بررسی گردیده است. به این منظور شکستگی‌های همراه با تاقدیس‌های کوه آسماری بدون شاهدی از گسل‌خوردگی (نوع اول)، کوه سولک متأثر از راندگی در یال پیشانی (نوع دوم) و کوه کمرآب در مجاورت با گسل عرضی ایذه (نوع سوم) مطالعه شده‌اند. پارامترهای موقعیت، فراوانی، فاصله‌داری، شدت، تراکم و طول شکستگی‌ها، طی مطالعات میدانی و با استفاده از تصاویر ماهواره‌ای بررسی شدند. مقایسه پارامترها در نواحی مختلف تاقدیس‌ها نشان داد که تمرکز شکستگی‌ها در نقاط مختلف آنها متفاوت است. همچنین نتایج مطالعه نشان داد، نواحی لولایی در تاقدیس نوع اول، پهلوی پیشانی بریده شده توسط گسل طولی در تاقدیس نوع دوم و دماغه جنوب شرقی متأثر از گسل عرضی در تاقدیس نوع سوم، دارای بیشترین شدت ـ تراکم شکستگی هستند. بنابراین با توجه به رابطه مستقیم بین تمرکز شکستگی‌ها با میزان هرزروی سیال حفاری و دیگر مشکلات حفاری مانند ریزش دیواره چاه، احتمال ناپایداری چاه‌های حفاری در این مناطق بیشتر می‌باشد.
 

کلیدواژه‌ها


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