تخمین شاخص منطقه جریانی با استفاده از نتایج تشدید مغناطیس هسته

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استاد، گروه زمین‎شناسی کاربردی، دانشکده علوم زمین، دانشگاه خوارزمی، تهران، ایران

2 دکترا، گروه زمین‎شناسی کاربردی، دانشکده علوم زمین، دانشگاه خوارزمی، تهران، ایران

3 استاد، گروه ژئوتکنیک، دانشکده عمران و محیط زیست، دانشگاه صنعتی امیرکبیر، تهران، ایران

چکیده

هدف اصلی در این مطالعه، بررسی امکان تخمین پارامتر شاخص منطقه جریانی در سنگ‌های کربناته با استفاده از ادغام مفهوم واحدهای جریان هیدرولیکی و مدل‎های تراوایی تشدید مغناطیس هسته است. برای بررسی قابلیت تخمین شاخص منطقه جریانی با استفاده از روش تشدید مغناطیس هسته از دو مدل اصلی تراوایی تیمور- کوتز و T2 میانگین، با توجه به گستردگی استفاده از آنها در سرتاسر دنیا، استفاده شده است. یکی از مهم‎ترین نکات در این مطالعه استفاده از نتایج آزمایش تشدید مغناطیس هسته در آزمایشگاه بر روی مغزه بوده که در ایران سابقه نداشته است. در این مطالعه 24 نمونه کربناته انتخاب و آزمایشات تخلخل، تراوایی و همچنین تشدید مغناطیس هسته بر روی آنها انجام شد. سپس با استفاده از نتایج آزمایشات تخلخل و تراوایی، شاخص منطقه جریانی مغزه تعیین و به عنوان شاخصی جهت ارزیابی دقت روش تشدید مغناطیس هسته در تخمین شاخص منطقه جریانی در نظر گرفته شد. با استفاده از پارامترهای به دست آمده از آزمایش تشدید مغناطیس هسته و مدل‎های تراوایی تشدید مغناطیس هسته، مقدار شاخص منطقه جریانی تخمین و با مقدار شاخص منطقه جریانی مغزه مقایسه شد. با توجه به نتایج به دست آمده به نظر می‌رسد مدل‌های تراوایی تشدید مغناطیس هسته، با ضرایب معمول، توانایی مناسبی برای تخمین شاخص منطقه جریانی را ندارند و نیاز به اصلاح ضرایب با توجه به جنس سنگ‎ها وجود دارد.

کلیدواژه‌ها


عنوان مقاله [English]

Estimation of Flow Zone Indicator by Using Nuclear Magnetic Resonance

نویسندگان [English]

  • Seyed Mahmoud Fatemi Aghda 1
  • Mashaallah Taslimi 2
  • Ahmad Fahimifar 3
1 Professor, Department of Applied Geology, Faculty of Geological Science, Kharazmi University, Tehran, Iran
2 Ph.D., Department of Applied Geology, Faculty of Geological Science, Kharazmi University, Tehran, Iran
3 Professor, Department of Geotechnic, Faculty of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran
چکیده [English]

The main aim of this study is to examine the feasibility of estimation of flow zone indicator in carbonate rocks by integration of hydraulic flow unit concept a nuclear magnetic resonance technology. The two main permeability models Timur-Cotes and mean T2 models, because of worldwide usage of these models, were used for evaluating the ability of nuclear magnetic resonance to estimate the flow zone indicator. One of the most important points in this study is the use of the experimental results of the nuclear magnetic resonance in laboratory on core that is never done in Iran. In this study, 24 carbonate samples were selected, and porosity, permeability and nuclear magnetic resonance experiments were performed. Then, using the results of the porosity and permeability tests, the flow zone indicator was determined and was considered as an index for evaluating the accuracy of the nuclear magnetic resonance method. Using the parameters obtained from the nuclear magnetic resonance test and nuclear magnetic resonance permeability models, flow zone indicator was estimated and compared with the core flow zone indicator. According to the results, it seems that the nuclear magnetic resonance permeability models, with the routine coefficients, do not have the proper ability to estimate the flow zone indicator, and it is necessary to correct the coefficients according to the lithology of rocks.

کلیدواژه‌ها [English]

  • Permeability
  • porosity
  • Nuclear magnetic resonance
  • Timur-Coates Permeability Model
  • Mean T2 Permeability Model

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