نشریه علوم زمین خوارزمی

نشریه علوم زمین خوارزمی

تخمین ضرایب هیدرودینامیک در آبخوان‌های آلوده به نفت

نویسندگان
فاطمه ابراهیمی 1
محمد نخعی 1
حمید رضا ناصری 2
کمال خدائی 2
1 دانشگاه خوارزمی
2 دانشگاه شهید بهشتی
10.22034/KJES.2023.8.2.103041
چکیده
یکی از مهمترین نگرانی ها در آبخوان های مجاور به تاسیسات نفتی، آلودگی ناشی از نشت LNAPL ها می باشد. این ترکیبات با توجه به وزن کمترشان نسبت به آب، به صورت لایه در روی سطح آب شناور می­مانند و همراه با جریان آب گسترش پیدا می­کنند. بازیافت LNAPL ها همواره مشکل و پر­هزینه است. این مطالعه قصد دارد با تعیین ضرایب هیدرودینامیکی LNAPL هزینه­های بازیافت را مدیریت نماید. ضرایب هیدرودینامیکی شامل قابلیت انتقال و آبدهی ویژه می باشد. در این مطالعه برای اولین بار بجای عبارت آبدهی ویژه از عبارت نفت دهی ویژه با توجه به نوع سیال موجود در آبخوان، استفاده شده است. برای محاسبه نفت دهی ویژه و حجم کل LNAPL از مدلسازی حجم LNAPL شناور روی سطح ایستابی توسط نرم افزار Rockwork و برای محاسبه ضریب قابلیت انتقال LNAPL از مدل LDRM (LNAPL Distribution and Recovery Model) استفاده شد. بدین صورت که پارامترهای خاک و LNAPL شامل تخلخل، هدایت هیدرولیکی اشباع آب، پارامترهای ونگنوختن، چگالی­های جرمی آب و LNAPL، کشش­های سطحی آب- LNAPL ، LNAPL-هوا و آب- هوا، ویسکوزیتی­های آب وLNAPL به عنوان پارامترهای ورودی به مدل LDRM معرفی شد و ضریب قابلیت انتقال و حجم ویژه قابل استحصال به عنوان نتایج خروجی از آن استخراج گردید. در پایان با کمک نتایج بدست آمده نقشه­های ضریب قابلیت انتقال، ضخامت و حجم قابل استحصال LNAPL تهیه و جهت یافتن بهترین محل­های بازیافت معرفی شدند.
کلیدواژه‌ها
ضرایب هیدرودینامیک
نفت دهی ویژه
قابلیت انتقال LNAPL
مدل LDRM

عنوان مقاله English

Estimation of Hydrodynamic Coefficients in Oil-Contaminated Aquifers

نویسندگان English

Fatemeh Ebrahimi 1
Mohammad Nakhaei 1
Hamid Reza Nassery 2
Kamal Khodaei 2
چکیده English

One of the most important concerns in aquifers adjacent to oil facilities is pollution caused by LNAPL leaks. Because these compounds have less weight than water, they float on the surface of the water as a layer and move along with the water flow. Recovery of LNAPLs is always difficult and expensive. This study aims to manage the recovering costs by determining the hydrodynamic coefficients of LNAPL. The hydrodynamic coefficients include transmissivity and specific yield. In this study, for the first time, instead of the term specific yield, the term oil specific yield has been used according to the type of fluid in the aquifer. The Rockwork model was used to calculate the oil specific yield and LDRM (LNAPL Distribution and Recovery Model) model was used to calculate LNAPL transmissivity coefficient. The inputs of the LDRM model include soil and LNAPL parameters, porosity, hydraulic conductivity of water saturation, van Genuchten parameters, mass densities of water and LNAPL, surface tensions of water-LNAPL, LNAPL-air and water-air, viscosities of water and LNAPL. From the inputs, LNAPL transmissivities and recoverable and total LNAPL specific volumes were extracted as output results. With the help of the obtained results, maps of LNAPL transmissivities, thickness and recoverable volume of LNAPL were prepared and the best recovery locations were introduced.

کلیدواژه‌ها English

Hydrodynamic Coefficients
Oil Specific Yield
LNAPL Transmissivity
LDRM Model
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