globalchange  > 气候变化事实与影响
DOI: 10.5194/hess-19-2763-2015
Scopus记录号: 2-s2.0-84934979571
论文题名:
Understanding NMR relaxometry of partially water-saturated rocks
作者: Mohnke O; , Jorand R; , Nordlund C; , Klitzsch N
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2015
卷: 19, 期:6
起始页码: 2763
结束页码: 2773
语种: 英语
Scopus关键词: Magnetic storage ; Pore size ; Relaxation time ; Rocks ; Water supply systems ; NMR relaxation time ; Nuclear magnetic resonance relaxometry ; Relaxation time distribution ; Saturation dependents ; Surface-to-volume ratio ; Triangular cross-sections ; Water distributions ; Water saturated rock ; Nuclear magnetic resonance ; amplitude ; capillary pressure ; cross section ; drainage ; nuclear magnetic resonance ; porosity ; rock property ; saturated medium ; water content
英文摘要: Nuclear magnetic resonance (NMR) relaxometry measurements are commonly used to characterize the storage and transport properties of water-saturated rocks. Estimations of these properties are based on the direct link of the initial NMR signal amplitude to porosity (water content) and of the NMR relaxation time to pore size. Herein, pore shapes are usually assumed to be spherical or cylindrical. However, the NMR response at partial water saturation for natural sediments and rocks may differ strongly from the responses calculated for spherical or cylindrical pores, because these pore shapes do not account for water menisci remaining in the corners of desaturated angular pores. Therefore, we consider a bundle of pores with triangular cross sections. We introduce analytical solutions of the NMR equations at partial saturation of these pores, which account for water menisci of desaturated pores. After developing equations that describe the water distribution inside the pores, we calculate the NMR response at partial saturation for imbibition and drainage based on the deduced water distributions. For this pore model, the NMR amplitudes and NMR relaxation times at partial water saturation strongly depend on pore shape, i.e., arising from the capillary pressure and pore shape-dependent water distribution in desaturated pores with triangular cross sections. Even so, the NMR relaxation time at full saturation only depends on the surface-to-volume ratio of the pore. Moreover, we show the qualitative agreement of the saturation-dependent relaxation-time distributions of our model with those observed for rocks and soils. © Author(s) 2015. CC Attribution 3.0 License.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78494
Appears in Collections:气候变化事实与影响

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作者单位: Institute for Applied Geophysics and Geothermal Energy (GGE), E.ON Energy Research Center (E.ON ERC), RWTH Aachen University, Mathieustrasse 10, Aachen, Germany

Recommended Citation:
Mohnke O,, Jorand R,, Nordlund C,et al. Understanding NMR relaxometry of partially water-saturated rocks[J]. Hydrology and Earth System Sciences,2015-01-01,19(6)
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