بررسی محیط رسوبی واحدهای شیلی سازند پابده-گورپی و تاثیر کانیهای رسی در پایداری دیواره چاه، میدان نفتی آغاجاری
محورهای موضوعی : زمین شناسی نفت
بهمن سلیمانی
1
(گروه زمین شناسی نفت و حوضه های رسوبی، دانشکده علوم زمین، دانشگاه شهیدچمران اهواز، )
زهرا دهقانی
2
(گروه زمین شناسی، دانشکده علوم پایه، دانشگاه آزاد اسلامی واحد علوم تحقیقات تهران)
کلید واژه: پایداری دیواره چاه, نمودار NGS, سازند پابده و گورپی, محیط رسوبی, میدان نفتی آغاجاری,
چکیده مقاله :
واحدهای شيلی یکی از عوامل مشکل ساز در پروسه حفاري مخازن نفتی محسوب می شوند. مطالعه کنونی در ارتباط با ناپايداري دیواره چاه به واسطه حضور کاني هاي رسي در سازندهای شيلي پابده – گورپي در میدان آغاجاری است. بررسی و شناسایی شیل ها با استفاده از روش آزمایشگاهی XRF و لاگ NGS صورت گرفته است. نتایج به دست آمده نشان داد که روشNGS نسبت به ایلیت حساس بوده و برای شناسایی آن کاربرد دارد. با توجه به میزان Fe2O3 ، بخش بالای پابده شرایط اکسیدان ولی به سمت گورپی شرایط احیا حاکم است. نقش سایر عناصر نیز در تشکیل کانی های رسی مورد بحث قرار گرفته است. براساس میزان آهن، منگنز و وانادیم، نمونه های مورد مطالعه در گروه 3 رده بندی Quinby-Hunt and Wilde قرار می گیرند (شرایط احیا ولی Eh احیا غیر سولفیدی و pH متوسط تا پایین). گستره تغییرات نسبت Th/U (5/1-4) نشانه تغییرات محیطی از دریایی تا حدواسط می باشد.
Shally units are one of the most problematic parameters in the process of drilling oil reservoirs. The current study is related to the instability of the wellbore due to the presence of clay minerals bearing shally units of the Pabdeh-Gurpi formations in Aghajari oilfield. Investigation and identification of shales were done using the XRF laboratory and NGS logs. The results showed that the NGS method is sensitive and applicable to identify Illite mineral merely. According to Fe2O3 content, the upper part of the oxidant conditions, but towards the Gurpi, is dominated by reduction condition. The role of other elements in the formation of clay minerals was discussed. Based on the amount of iron, manganese and vanadium, the samples are classified as the Quinby_Hunt and Wilde class lll (non-sulfide resuscitation but Eh recovery and medium to low pH). The range of changes in the Th/U ratio (4-1.5) signified an environment with changes from sea to intermediate states.
سليماني، ب.، قلاوند، ه. و شيخ‌زاده، ح.، 1382، استفاده از نمودار الكتريكي NGS در شناسايی كانی‌های رسي سازندهای پابده و گورپی ميدان نفتی اهواز، مجموعه مقالات يازدهمين كنفرانس بلورشناسی و كانی‌شناسی، ايران ـ يزد
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