بررسی زیست محیطی پسماندهای حفاری: مطالعه موردی پسماندهای چاه شماره 449 میدان نفتی اهواز

نوع مقاله: مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد زمین شناسی ژئوشیمی دانشگاه خوارزمی

2 گروه زمین شناسی دانشگاه شهید بهشتی تهران

3 گروه زمین شناسی دانشگاه شهید چمران اهواز

چکیده

      در این تحقیق، تاثیر مواد افزودنی گل­ و سازندهای حفاری شده در غلظت فلزات پسماندهای حفاری چاه 449 میدان نفتی اهواز مورد بررسی قرار گرفت. نمونه­برداری از مواد افزودنی گل، گل­های حفاری، پسماند (گل+خرده) سازندهای حفاری شده و همچنین خاکهای اطراف منطقه حفاری صورت گرفت. پس از آماده­سازی نمونه­ها، برای تعیین غلظت فلزات از روشهای ICP-MS و ICP-OES استفاده شد.
نتایج نشان می­دهد که باریت منشا فلزات Cu, Zn, Ag، بنتونیت منشا فلزات Ni, V, Zn، فروبار منشا فلزات Zn, V, Ni, Cr، گل پایه آبی سنگین منشا فلزات Cu, Ag، شیل­ها منشا فلزات Cr, Zn, V، شیل­های بیتومینه منشا فلزات Cd, Cr, Zn, V و سنگ­آهک منشا فلز Ba در سازند پابده، ماسه­سنگ منشا فلز Cr، مارن­خاکستری منشا فلزات Cr, Cu, V و آهک منشا فلز Sr در سازند آسماری، مارن­خاکستری آهکی و آهک­های شیلی گورپی منشا فلز Cu، سنگ­آهک سازند ایلام منشا فلزات Cu, Ag، و سنگ­آهک سازند سروک منشا فلز Ba هستند. این تحقیق نشان داد که علاوه بر گل حفاری، سنگ­های حفاری شده نیز منبع فلزات هستند و در مواردی موجب افزایش غلظت فلزات در پسماندهای حفاری شده­اند.پسماندهای حفاری چاه 449 اهواز براساس بررسی­های زیست محیطی نسبت به فلزات Cu و Ag آلودگی متوسط تا شدید، نسبت به Cd نسبتا آلوده، نسبت به Sr و Ba غیرآلوده تا نسبتا آلوده هستند و نسبت به دیگر فلزات آلوده نیستند.
 

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