تحلیل شکستگی‌ها با روش سنجش از دور و اهمیت آن در مطالعات ذخایر هیدروکربوری، گروه بنگستان تاقدیس انجیر

نوع مقاله : مقاله پژوهشی

نویسندگان

1 فارغ التحصیل گروه زمین شناسی دانشگاه اصفهان- ایران

2 هیات علمی گروه زمین شناسی دانشگاه اصفهان

چکیده

به منظور روشن نمودن اهمیت شکستگی ها در اکتشاف و استخراج ذخایر هیدروکربوری، تاقدیس انجیر با توجه به رخنمون مناسب گروه بنگستان، در جنوب باختری حوضه‏ لرستان از کمربند چین‏خورده– رانده زاگرس انتخاب شده است. در این پژوهش با استفاده از مطالعات دورسنجی به چهار روش شامل تشخیص بصری خطواره ‏ها، استخراج اتوماتیک خطواره‏ ها، نقشه خطوط هم‏پایه و الگوی تغییرات پیچ و خم رودخانه ‏ها، به شناسایی شکستگی ‏های محدوده‏ تاقدیس انجیر پرداخته شده است. تفسیر شکستگی‏ های به دست آمده از این چهار روش و مطالعات صحرایی انجام شده جهت شناسایی و صحت سنجی این شکستگی‏ ها نشان می ‏دهد هر چهار روش در بارزسازی شکستگی ‏ها در این محدوده کارایی مناسبی دارند. مطالعه‏ طول و فاصله‏ی شکستگی ‏ها به طور کلی نشان ‏دهنده درجه بلوغ ساختاری زیاد بخش شمال غربی نسبت به بخش جنوب شرقی این تاقدیس می ‏باشد. پارامترهای تراکم، تجمع و بعد فراکتال شکستگی‏ ها در بخش غربی تاقدیس بیشترین مقدار را برخوردارند که به نظر می رسد سیستم های گسلی با روند شمال باختری – جنوب خاوری واقع در بخش غربی تاقدیس بیشترین نقش را در اعمال تنش و ایجاد شکستگی ‏ها، به خصوص در گروه بنگستان محدوده‏ تاقدیس انجیر داشته است. با توجه به انطباق بالای تراکم شکستگی‏ ها و درجه بلوغ ساختاری بخش غربی تاقدیس انجیر با محدوده ‏های مستعد از نظر هیدروکربوری، نتایج این مطالعه کلید قابل اطمینانی برای پی‏جویی مناطق مستعد هیدروکربوری با هدف گروه بنگستان در سایر مناطق و در اعماق، ارائه داده است.

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