IGEBA   23946
INSTITUTO DE GEOCIENCIAS BASICAS, APLICADAS Y AMBIENTALES DE BUENOS AIRES
Unidad Ejecutora - UE
capítulos de libros
Título:
Rock magnetic properties of drill cutting from a hydrocarbon
Autor/es:
MENA, MABEL; WALTHER, ANA MARÍA
Libro:
Remagnerization and Chemical alteration of sedimentary rocks.
Editorial:
GEOLOGICAL SOCIETY OF LONDON, SPECIAL PUBLICATIONS
Referencias:
Lugar: LONDON; Año: 2012;
Resumen:
Abstract:
The Golfo San Jorge Basin is one of the most important hydrocarbon-producing basins
in Argentina. A study of magnetic properties performed on drill cutting from an oil well drilled in
this basin was carried out. The cutting samples, taken from an interval of about 400 m thickness,
correspond to the upper units of the Pozo D-129 Formation, the main source rock of the basin. Magnetic
susceptibility measurements were made and rock-magnetism studies were conducted. Concentration
indices of the different magnetic species determined were calculated based on
isothermal remanent magnetization acquisition curves. A correlation analysis among magnetic
properties, hydrocarbon content and well logs (sonic, neutron, density, induction, resistivity and
photoelectric factor) was performed. Several kinds of significant correlations were found: a positive
correlation between susceptibility and relative hydrocarbon content; a positive correlation
between magnetic properties and porosities (especially good with the neutron log porosity); and
a negative correlation between the concentration indices of some magnetic species (magnetite
and pyrrhotite) and resistivity. Pyrrhotite could be directly related to the presence or migration
of hydrocarbons through the porous units.
The qualitative correlations between magnetic data and key petrophysical parameters such as
porosity, along with the association of magnetic mineralogy to hydrocarbon presence or migration,
suggest the potential usefulness of these techniques for subsurface exploration.
in Argentina. A study of magnetic properties performed on drill cutting from an oil well drilled in
this basin was carried out. The cutting samples, taken from an interval of about 400 m thickness,
correspond to the upper units of the Pozo D-129 Formation, the main source rock of the basin. Magnetic
susceptibility measurements were made and rock-magnetism studies were conducted. Concentration
indices of the different magnetic species determined were calculated based on
isothermal remanent magnetization acquisition curves. A correlation analysis among magnetic
properties, hydrocarbon content and well logs (sonic, neutron, density, induction, resistivity and
photoelectric factor) was performed. Several kinds of significant correlations were found: a positive
correlation between susceptibility and relative hydrocarbon content; a positive correlation
between magnetic properties and porosities (especially good with the neutron log porosity); and
a negative correlation between the concentration indices of some magnetic species (magnetite
and pyrrhotite) and resistivity. Pyrrhotite could be directly related to the presence or migration
of hydrocarbons through the porous units.
The qualitative correlations between magnetic data and key petrophysical parameters such as
porosity, along with the association of magnetic mineralogy to hydrocarbon presence or migration,
suggest the potential usefulness of these techniques for subsurface exploration.
The Golfo San Jorge Basin is one of the most important hydrocarbon-producing basins
in Argentina. A study of magnetic properties performed on drill cutting from an oil well drilled in
this basin was carried out. The cutting samples, taken from an interval of about 400 m thickness,
correspond to the upper units of the Pozo D-129 Formation, the main source rock of the basin. Magnetic
susceptibility measurements were made and rock-magnetism studies were conducted. Concentration
indices of the different magnetic species determined were calculated based on
isothermal remanent magnetization acquisition curves. A correlation analysis among magnetic
properties, hydrocarbon content and well logs (sonic, neutron, density, induction, resistivity and
photoelectric factor) was performed. Several kinds of significant correlations were found: a positive
correlation between susceptibility and relative hydrocarbon content; a positive correlation
between magnetic properties and porosities (especially good with the neutron log porosity); and
a negative correlation between the concentration indices of some magnetic species (magnetite
and pyrrhotite) and resistivity. Pyrrhotite could be directly related to the presence or migration
of hydrocarbons through the porous units.
The qualitative correlations between magnetic data and key petrophysical parameters such as
porosity, along with the association of magnetic mineralogy to hydrocarbon presence or migration,
suggest the potential usefulness of these techniques for subsurface exploration.