Initial Measurements of Petrophysical Properties on Rocks from the Los Azufres, Mexico, Geothermal Field Page: 4 of 10
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PROCEEDINGS, Eleventh Workshop on Geothermal Reservoir Engineering.
Stanford University, Stanford, California, January 21-23, 1986
INITIAL MEASUREMENTS OF PETROPHYSICAL PROPERTIES ON ROCKS FROM THE
LOS AZUFRES, MEXICO, GEOTHERMAL FIELD
E. Contreras and E. Iglesias
Instituto de Investigaciones El ctricas
Apartado Postal 475
Cuernavaca, Morelos, Mexico.
Petrophysical properties of geothermal
reservoir rocks are valuable
information for many activities,
including reservoir characterization,
modelling, field test analysis and
planning of exploitation techniques.
Petrophysical data of rocks from
geothermal reservoirs located in
volcanic areas is in general very
scarce. In particular, no
petrophysical data of rocks from the
Los Azufres geothermal field area has
ever been published.
This work presents the results of
initial petrophysical studies on
outcrop rocks and drill core samples
from the Los Azufres geothermal field.
These studies are the first part of an
ongoing experimental program intended
to establish a data-base about physical
properties of the Los Azufres rocks, in
support of the many reservoir
engineering activities which require of
The experimental work carried out
consisted of laboratory measurements of
density, porosity, permeability,
compressibility, thermal conductivity,
thermal expansion, electrical
resistivity and sonic wave velocities.
Some of the experiments were aimed 'at
investigation of the effects of
temperature, pressure,, saturation and
other parameters on the physical
properties of rocks.
DESCRIPTION OF SAMPLES
The specimens for this study were cut
from outcrop rocks collected at eight
sites in the Los Azufres area and drill
core samples from the wells Al, A5, A9
and A19. Fig. 1 is a map showing the
approximate location of the outcrop
sampling sites, which are indicated by
numbers 1 to 8, and the four wells.
Comision Federal de Electricidad
Av. Las Camelinas 3527, Piso 7
Morelia, Michoacdn, Mexico.
Fig. 1. Map of the
Geothermal . field area
approximate location of
sampling sites and wells.
Taking into account the geology of the
area, the .outcrop rocks were sampled
from specific sites thought to be
representative of the subsurface
formations. Care was taken to avoid
sampling outcrop rocks showing evidence
of weathering processes. The drill
core samples were provided by Comision
Federal de Electricidad (CFE) from its
valuable stock of cores retrieved
during drilling operations.
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SURFACE ROCK SAMPLING SITES
LOCATION OF SOME WELLS
SAMPLES WERE STUDIED
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Contreras, E.; Iglesias, E. & Razo, E. Initial Measurements of Petrophysical Properties on Rocks from the Los Azufres, Mexico, Geothermal Field, article, January 21, 1986; United States. (https://digital.library.unt.edu/ark:/67531/metadc885779/m1/4/: accessed April 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.