Eur. Phys. J. Appl. Phys.
Volume 42, Number 3, June 2008
|Page(s)||321 - 326|
|Section||Imaging, Microscopy and Spectroscopy|
|Published online||06 May 2008|
Relaxation-diffusion processes in natural porous media: sedimentary rocks
Universidad Central de Venezuela, Facultad de Ciencias, Escuela de
Física, Centro de Física Molecular y Médica, Laboratorio de
Física Molecular, Caracas, Venezuela
2 Instituto de Ciencias de la Tierra, Caracas, Venezuela
Corresponding author: firstname.lastname@example.org
Revised: 1 March 2008
Accepted: 5 March 2008
Published online: 6 May 2008
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.
PACS: 33.25.+k – Nuclear resonance and relaxation / 76.60.Es – Relaxation effects / 76.60.Lz – Spin echoes / 82.56.Lz – Diffusion
© EDP Sciences, 2008
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