کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8123708 1522538 2016 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Multi-scale x-ray computed tomography analysis of coal microstructure and permeability changes as a function of effective stress
ترجمه فارسی عنوان
تجزیه و تحلیل توموگرافی کامپیوتری اشعه ایکس چندمتغیره از ریز ساختار زغال سنگ و تغییرات نفوذ پذیری به عنوان عملکرد استرس موثر
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی اقتصادی
چکیده انگلیسی
Gas permeability (k) and porosity (φ) are the most important parameters in CBM/ECBM and CCS in deep unmineable coal seams. k and φ depend on the coal microstructure, and k and φ significantly change with varying effective stress. However, how the coal microstructure is related to such permeability and porosity changes is only poorly understood. We thus imaged sub-bituminous coal samples at two resolutions (medium - 33.7 μm and high - 3.43 μm voxel size) in 3D with an x-ray micro-computed tomography as a function of applied effective stress; and investigated how cleat morphology, k and φ are influenced by the changes in effective stress and how these parameters are interrelated. In the images, three phases were identified: microcleats (void), a mineral phase (carbonate) and the coal matrix. When effective stress increased, the cleats became narrow and closed or disconnected. This resulted in a dramatic permeability drop with increasing effective stress, while porosity decreased only linearly.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Coal Geology - Volume 165, 1 August 2016, Pages 149-156
نویسندگان
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