نشریه علوم زمین خوارزمی

نشریه علوم زمین خوارزمی

بررسی نقش شرایط محیطی در پراکندگی عناصر(اصلی، جزئی و کمیاب) با استفاده از تفسیرها و مدل‌های ژئوشیمیایی در نهشته‌های رسوبی قالیکوه لرستان

نویسندگان
امیر سعید حسینی
مهراب رشیدی
سیده اکرم جویباری
منوچهر دریابنده
شرکت ملی نفت ایران
10.22034/KJES.2025.11.1.107911
چکیده
شیل‌های نفتی به عنوان یک منبع مهم هیدروکربنی، نیازمند بررسی دقیق از نظر توزیع عناصر مختلف هستند. مدل‌های ژئوشیمیایی ابزاری قدرتمند برای درک توزیع عناصر و عوامل مؤثر بر آن‌ها بوده و به بهینه‌سازی اکتشاف و بهره‌برداری از این منابع کمک می‌‌کنند. تفسیرهای ژئوشیمیایی نیز جهت شناسایی ناهنجاری‌ها ، ذخایر و ترکیب آن‌ها به کار می‌روند. لذا در این مطالعه برای تعیین پراکندگی عناصر مختلف در نهشته‌های رسوبی حاوی شیل‌های نفتی، تمرکز اصلی بر تأثیر شرایط اکسیداسیون-احیاء و آب و هوای محیط تشکیل سنگ‌های منشأ صورت گرفته است. بدین منظور برای ارزیابی نهشته‌های اطراف رودخانه قُلیان منطقه قالیکوه لرستان، 15نمونه سطحی از این نهشته‌ها برداشت و مورد آنالیزهای XRD و ICP قرار گرفت. همچنین برای بررسی پتروگرافی تعداد 80 مقطع نازک میکروسکوپی تهیه گردید و برای تعیین میزان کل مواد آلی نمونه‌های شیل ‌نفتی نیز آنالیز Rock-Eval Pyrolysis انجام شد. نتایج مدل‌های ژئوشیمیایی نشان داد، کانی‌های آواری (کوارتز، کانی‌های رسی) و کانی‌های کربناته (کلسیت، دولومیت) از اصلی‌ترین کانی‌های نهشته‌های مذکور می‌باشند و این نهشته‌ها معادل سنگ‌های آذرین حد واسط-حد واسط فلسیک می‌باشند و در محدودۀ آرکوز، لیتارنایت و شیل قرار گرفته‌اند که در محیط فرورانشی و برخوردی به وجود آمده‌اند. میانگین مقادیر شاخص‌های هوازدگی و شاخص‌های تعیین شرایط اکسیداسیون-احیاء مؤید هوازدگی نسبتاً ملایم نهشته‌ها است که در محدودۀ آب و هوای خشک قرار دارند و با رسیدگی اندک، همچنان به چرخۀ مجدد رسوبی نرسیده‌اند و در محیط احیایی تشکیل شده‌اند. نتایج حاصل از نمونه‌های مورد مطالعه در این تحقیق حاکی از آن است که میزان هوازدگی (اکسیدهای آلومینیوم، منگنز، سدیم، تیتانیوم، منیزیم)، کانی زیرکن (عناصر خاکی کمیاب و عناصر جزئی مانند: توریم، زیرکونیوم، نیوبیوم، تانتانیوم)، تشکیل مواد آلی شیل‌های نفتی در شرایط احیایی محیط (نیکل، اورانیوم، وانادیوم، کبالت، کروم)؛ در کنار پراکندگی کانی‌های رسی (مس، روی)، پدیدۀ جذب-واجذب و جانشینی یون‌ها (استرانسیوم)، دگرسانی (روبیدیوم) از عوامل اصلی تغییرات ژئوشیمیایی محسوب می‌شوند.

کلیدواژه‌ها
شیل‌های نفتی
مدل‌های ژئوشیمیایی
عناصر خاکی کمیاب و جزئی
اکسیداسیون-احیاء
هوازدگی

عنوان مقاله English

Investigating the role of environmental conditions in the dispersion of elements (major, minor and trace) using geochemical interpretations and models in the sedimentary deposits of Qalikuh, Lorestan

نویسندگان English

Amirsaeid Hosseini
Mehrab Rashidi
Seyedeh Akram Jooybari
Manuchehr Daryabandeh
M.Sc, Geological Operations, Exploration Management, National Iranian Oil Company, Tehran, Iran
چکیده English

Oil shales, as an important hydrocarbon source, require careful investigation in terms of the distribution of various elements. Geochemical models are a powerful tool for understanding the distribution of elements and the factors affecting them, and help optimize the exploration and exploitation of these resources. Geochemical interpretations are also used to identify anomalies, and reserves, and determine their composition. Therefore, in this study, to determine the distribution of various elements in sedimentary deposits containing oil shales, the main focus has been on the effect of oxidation-reduction conditions and climate of the source rock formation environment. For this purpose, to evaluate the deposits around the Qolyan River in the Qalikuh region of Lorestan, 15 surface samples were taken from these deposits and subjected to XRD and ICP analyses. Also, 80 thin microscopic sections were prepared for petrographic examination. Rock-Eval Pyrolysis analysis was also performed to determine the total organic matter content of oil shale samples. The results of geochemical models showed that detrital minerals (quartz, clay minerals) and carbonate minerals (calcite, dolomite) are the main minerals in the aforementioned deposits. These deposits are equivalent to intermediate-intermediate felsic igneous rocks and are located in the arkose, litharenite, and shale ranges, which were formed in a subduction and collisional environment. The average values ​​of weathering indices and oxidation-reduction condition determination indices confirm the relatively mild weathering of the deposits, which are located in the dry climate zone and, with little maturity, have not yet reached the sedimentary cycle and were formed in a reduction environment. The main factors of geochemical changes in this study are: Weathering rate (oxides Al2O3, MnO, Na2O, TiO2, MgO), zircon mineral (rare earth elements and minor elements such as: Th, Zr, Nb, Ta), development of total organic matter (TOC) in oil shales under environment of reduction conditions (Ni، U، V، Co، Cr), dispersion of clay minerals (Cu, Zn), adsorption-repulsion phenomena and substitution of ions (Sr), alteration (Rb).

کلیدواژه‌ها English

Geochemical models
Oil shales
Oxidation-reduction
Minor and rare earth elements
Weathering
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