مطالعه ایکنوفابریک ها، محیط رسوبی و محیط زیست دیرینه بخش گوری در برش های چینه شناسی در میادین نفتی چهاربیشه، آغاجری و پارسی، جنوبغرب ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی مقطع دکتری، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران، تهران، ایران

2 گروه زمین شناسی، دانشکده علوم، دانشگاه لرستان

3 گروه علوم زمین، دانشکده علوم پایه، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران، تهران، ایران

چکیده

چکیده
بخش گوری سازند میشان به عنوان یکی از مخازن گازی حوضه زاگرس متشکل از سنگ آهک، مارن و انیدریت می باشد. به منظور بررسی فسیل های اثری، رخساره ها و محیط رسوبی بخش گوری سازند میشان در جنوب غرب ایران 3 برش چینه شناسی میلاتون در میدان نفتی چهاربیشه، امیدیه در میدان نفتی آغاجاری و برش روستای شهید رجایی در میدان نفتی پارسی مورد بررسی دقیق قرار گرفتند. مطالعه سنگ شناسی و تحلیل مجموعه زیستی بخش گوری منجر به شناسایی 9 رخساره مربوط به محیطهای جزر و مدی، لاگون و سد گردید که مربوط به یک رمپ کربناته می باشند. کربناتهای بخش گوری مملو از آثار فسیلی Thalassinoides suevicus مربوط به سخت پوستان می باشند. این گونه از تالاسینوئیدسها در فرم های استوانه ای (cylindrical)، Y، T،question mark (به شکل علامت سوال) و کمانی دیده می شوند. آشفتگی زیستی حاصل از تالاسینوئیدس ها در لایه های مورد مطالعه به 5 رده ایکنوفابریک تقسیم بندی می شود که معادل شاخص های ایکنوفابریکی استاندارد رده 1 تا 5 می باشند. تنوع ایکنوفابریکها در برش چینه شناسی امیدیه نسبت به برش روستای شهید رجایی بیشتر می باشد که به دلیل تغییرات بیشتر در شرایط محیطی مثل عمق و اکسیداسیون در این برش است. همچنین حضور تالاسینوئیدسها در بخش گوری نشان دهنده یک محیط دریایی گرم و خیلی کم عمق می باشد.

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