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Relaxation-diffusion processes in natural porous media: sedimentary rocks

Published online by Cambridge University Press:  06 May 2008

D. Pérez ,
A. Benavides  and
M. Martín-Landrove
D. Pérez
Affiliation:
Universidad Central de Venezuela, Facultad de Ciencias, Escuela de Física, Centro de Física Molecular y Médica, Laboratorio de Física Molecular, Caracas, Venezuela
A. Benavides
Affiliation:
Instituto de Ciencias de la Tierra, Caracas, Venezuela
M. Martín-Landrove*
Affiliation:
Universidad Central de Venezuela, Facultad de Ciencias, Escuela de Física, Centro de Física Molecular y Médica, Laboratorio de Física Molecular, Caracas, Venezuela
*
[email protected]
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Abstract

Carr-Purcell-Meiboom-Gill (CPMG) experiments were made upon sedimentary rock samples at different RF pulsation rates. A dispersion of the transversal relaxation rate was observed. The experiments revealed that due to the diffusional processes there is a diminution of the second moment of the absorption line with the delay time between the RF pulses and the echo time, with a complex evolution characterized either as a stretched exponential or a power-law behavior as a function of the echo time, with parameters dependent on the characteristic time of the experiment, i.e., the delay between RF pulses. Results show that the observed behavior is dependent on permeability and geometrical properties of the sedimentary rock.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 42 , Issue 3 , June 2008 , pp. 321 - 326
Copyright
© EDP Sciences, 2008

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