An improved technique for computing permeability from NMR measurements in mudstones

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doi: 10.1029/2011JB008353
Author(s): Daigle, Hugh; Dugan, Brandon
Author Affiliation(s): Primary:
Rice University, Department of Earth Science, Houston, TX, United States
Volume Title: Journal of Geophysical Research
Source: Journal of Geophysical Research, 116(B8). Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0148-0227
Note: In English. 54 refs.; illus., incl. 2 tables, sketch maps
Summary: We develop a technique for extending nuclear magnetic resonance (NMR) permeability estimation to clay-rich sediments. Our technique builds on the Schlumberger-Doll Research (SDR) equation by using porosity, grain size, specific surface, and magnetic susceptibility data to yield more accurate permeability estimation in mudstones with large pore surface areas and complex mineralogies. Based on measurements of natural sediments as well as resedimented laboratory mixtures of silica, bentonite, and kaolinite powders, we find that our method predicts permeability values that match measured values over four orders of magnitude and among lithologies that vary widely in grain size, mineralogy, and surface area. Our results show that the relationship between NMR data and permeability is a function of mineralogy and grain geometry, and that permeability predictions in clay-rich sediments can be improved with insights regarding the nature of the pore system made by the Kozeny theory. This technique extends the utility of NMR measurements beyond typical reservoir-quality rocks to a wide range of lithologies.
Year of Publication: 2011
Key Words: 06 Petrology, Sedimentary; Asia; Atlantic Ocean; Clastic rocks; Clay minerals; Far East; Grain size; Granulometry; Gulf of Mexico; Honshu; Japan; Keathley Canyon; Magnetic properties; Magnetic susceptibility; Marine sediments; Mineral composition; Mississippi Canyon; Mudstone; NMR spectra; Nankai Complex; North Atlantic; North Pacific; Northwest Pacific; Pacific Ocean; Paleomagnetism; Permeability; Porosity; Sedimentary rocks; Sediments; Sheet silicates; Silicates; Spectra; West Pacific
Coordinates: N280000 N290000 W0890000 W0901500
N300000 N360000 E1400000 E1300000
Record ID: 2012023819
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