Open AccessFluid-Rock Characterization and Interactions in NMR Well Logging
Author(s) -
George J. Hirasaki,
Kishore K. Mohanty
Publication year - 2001
Language(s) - English
Resource type - Reports
DOI - 10.2172/782901
Subject(s) - propane , diffusion , methane , permeability (electromagnetism) , relaxation (psychology) , self diffusion , viscosity , chemistry , nuclear magnetic resonance , analytical chemistry (journal) , mineralogy , materials science , thermodynamics , physics , composite material , organic chemistry , membrane , computer science , psychology , social psychology , biochemistry , self service , computer security
This semi-annual report briefly summarizes the progress since the 1st Annual Report issued September, 2000 and the next annual report. More detailed results will be in the annual reports. The main emphasis on fluid properties was on measurements of the relaxation time and self-diffusion coefficient of ethane and propane. Ethane is similar to methane while propane is more similar to the higher alkanes. The ratio of T1 and T2 is demonstrated to be a function of both viscosity and the NMR frequency. The diffusion-induced T2 in a uniform magnetic gradient was simulated in one dimension to seek improved understanding NMR diffusion in restricted geometry. Analytical solutions can be found for this system if the correct region of validity is used. Estimation of permeability of vuggy carbonates has been problematic because the pore body size does not correlate well with pore throat size. CT scans and CPMG NMR measurements were made on a set of vuggy carbonate rocks
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