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NMR imaging of multiphase flow in porous media
Author(s) -
Chen Songhua,
Qin Fangfang,
Kim KyungHoe,
Watson A. Ted
Publication year - 1993
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690390602
Subject(s) - saturation (graph theory) , porous medium , transverse plane , porosity , relaxation (psychology) , nuclear magnetic resonance , mechanics , materials science , physics , composite material , engineering , mathematics , psychology , social psychology , combinatorics , structural engineering
Nuclear magnetic resonance (NMR) imaging techniques are used to determine porosity and saturation distributions. Difficulties in quantitation which arise from the short transverse relaxation times exhibited by fluids in porous media are addressed. Procedures are presented whereby transverse relaxation during the signal acquisition process is modeled to obtain accurate estimates of intrinsic magnetization intensity, and thus porosity and saturation. Special consideration is given to saturation/position dependence and multiexponential behavior of transverse relaxation. These procedures are validated with results for longitudinal profile images. The use of thin‐slice cross‐sectional profile images are demonstrated by observing fluid displacement in a rock sample with structural heterogeneities.