IFEG   20353
INSTITUTO DE FISICA ENRIQUE GAVIOLA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Sedimentary rock porosity studied by electromagnetic techniques: Nuclear Magnetic Resonance and Dielectric Permittivity
Autor/es:
RAMIA M.E.; MARTÍN C.A.
Lugar:
Córdoba
Reunión:
Otro; Trabajos de Física de FaMAF; 2012
Institución organizadora:
FaMAF - UNC
Resumen:
The present work involves a comprehensive experimental study of porosity and pore size distribution of sedimentary rocks, from oil fields formations, by means of two electromagnetic techniques, namely proton (1H) Nuclear Magnetic Resonance (NMR) and Dielectric Constant (DC) as function of the frequency, both providing complementary results. The NMR yields an accurate determination of the relative pore size distribution and movable and irreducible fluids. The DC measurement allows to obtain the dc electrical resistivity of the samples with different degrees of hydration. Thus, combining these techniques allow the determination of the tortuosity factor, by means of Archies’s relation, and from it the average pore channel length These measurements are performed on a fully hydrated (saturated), centrifuged, dried and cleaned rocks and also on samples with the irreducible fluids. Finally the results are complemented with capillary pressure measurements to obtain the total volume associated with the pore channels related to the rock permeability. Additionally, the work presents a novel method of the use of a network analyzer to measure the DC.