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 Archiess 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.