Petrophysical and mechanical rock property database of the Los Humeros and Acoculco geothermal fields (Mexico)
Por:
Weydt, Leandra M., Ramírez-Guzmán A.A., Pola, Antonio, Lepillier, Baptiste, Kummerow, Juliane, Mandrone, Giuseppe, Comina, Cesare, Deb, Paromita, Norini, Gianluca, Gonzalez-Partida, Eduardo, Ramon Avellan, Denis, Maciás J.L., Bär K., Sass, Ingo
Publicada:
23 feb 2021
Categoría:
Earth and planetary sciences (miscellaneous)
Resumen:
Petrophysical and mechanical rock properties are key parameters for the
characterization of the deep subsurface in different disciplines such as
geothermal heat extraction, petroleum reservoir engineering or mining.
They are commonly used for the interpretation of geophysical data and
the parameterization of numerical models and thus are the basis for
economic reservoir assessment. However, detailed information regarding
petrophysical and mechanical rock properties for each relevant target
horizon is often scarce, inconsistent or distributed over multiple
publications. Therefore, subsurface models are often populated with
generalized or assumed values resulting in high uncertainties.
Furthermore, diagenetic, metamorphic and hydrothermal processes
significantly affect the physiochemical and mechanical properties often
leading to high geological variability. A sound understanding of the
controlling factors is needed to identify statistical and causal
relationships between the properties as a basis for a profound reservoir
assessment and modeling.
Within the scope of the GEMex project (EU H2020, grant agreement no.
727550), which aims to develop new transferable exploration and
exploitation approaches for enhanced and super-hot unconventional
geothermal systems, a new workflow was applied to overcome the gap of
knowledge of the reservoir properties. Two caldera complexes located in
the northeastern Trans-Mexican Volcanic Belt - the Acoculco and Los
Humeros caldera were selected as demonstration sites.
The workflow starts with outcrop analog and reservoir core sample
studies in order to define and characterize the properties of all key
units from the basement to the cap rock as well as their mineralogy and
geochemistry. This allows the identification of geological
heterogeneities on different scales (outcrop analysis, representative
rock samples, thin sections and chemical analysis) enabling a profound
reservoir property prediction.
More than 300 rock samples were taken from representative outcrops
inside the Los Humeros and Acoculco calderas and the surrounding areas
and from exhumed ``fossil systems'' in Las Minas and Zacatlan.
Additionally, 66 core samples from 16 wells of the Los Humeros
geothermal field and 8 core samples from well EAC1 of the Acoculco
geothermal field were collected. Samples were analyzed for particle and
bulk density, porosity, permeability, thermal conductivity, thermal
diffusivity, and heat capacity, as well as ultrasonic wave velocities,
magnetic susceptibility and electric resistivity. Afterwards,
destructive rock mechanical tests (point load tests, uniaxial and
triaxial tests) were conducted to determine tensile strength, uniaxial
compressive strength, Young's modulus, Poisson's ratio, the bulk
modulus, the shear modulus, fracture toughness, cohesion and the
friction angle. In addition, X-ray diffraction (XRD) and X-ray
fluorescence (XRF) analyses were performed on 137 samples to provide
information about the mineral assemblage, bulk geochemistry and the
intensity of hydrothermal alteration.
An extensive rock property database was created (Weydt et al., 2020;
https://doi.org/10.25534/tudatalib201.10), comprising 34 parameters
determined on more than 2160 plugs. More than 31 000 data entries were
compiled covering volcanic, sedimentary, metamorphic and igneous rocks
from different ages (Jurassic to Holocene), thus facilitating a wide
field of applications regarding resource assessment, modeling and
statistical analyses.
Filiaciones:
Weydt, Leandra M.:
Department of Geothermal Science and Technology, Technische Universität Darmstadt, Schnittspahnstraße 9, Darmstadt, 64287, Germany
Tech Univ Darmstadt, Dept Geothermal Sci & Technol, Schnittspahnstr 9, D-64287 Darmstadt, Germany
Ramírez-Guzmán A.A.:
Escuela Nacional de Estudios Superiores - Unidad Morelia, Universidad Nacional Autónoma de México, Antigua Carretera a Pátzcuaro 8701, Morelia, Michoacán, 58190, Mexico
Pola, Antonio:
Escuela Nacional de Estudios Superiores - Unidad Morelia, Universidad Nacional Autónoma de México, Antigua Carretera a Pátzcuaro 8701, Morelia, Michoacán, 58190, Mexico
Univ Nacl Autonoma Mexico, Unidad Morelia, Escuela Nacl Estudios Super, Antigua Carretera Patzcuaro 8701, Morelia 58190, Michoacan, Mexico
Lepillier, Baptiste:
Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, Delft, 2628CD, Netherlands
Delft Univ Technol, Fac Civil Engn & Geosci, Stevinweg 1, NL-2628 CD Delft, Netherlands
Kummerow, Juliane:
GFZ Research Centre for Geoscience, Telegrafenberg, Potsdam, 14473, Germany
GFZ Res Ctr Geosci, D-14473 Potsdam, Germany
Mandrone, Giuseppe:
Department of Earth Sciences, University of Turin, Via Valperga Caluso 35, Turin, 10125, Italy
Univ Turin, Dept Earth Sci, Via Valperga Caluso 35, I-10125 Turin, Italy
Comina, Cesare:
Department of Earth Sciences, University of Turin, Via Valperga Caluso 35, Turin, 10125, Italy
Univ Turin, Dept Earth Sci, Via Valperga Caluso 35, I-10125 Turin, Italy
Deb, Paromita:
Institute for Applied Geophysics and Geothermal Energy, E.ON Energy Research Center, RWTH Aachen, Mathieustraße 10, Aachen, 52074, Germany
Rhein Westfal TH Aachen, Inst Appl Geophys & Geothermal Energy, E ON Energy Res Ctr, Mathieustr 10, D-52074 Aachen, Germany
Norini, Gianluca:
Istituto di Geologia Ambientale e Geoingegneria, Consiglio Nazionale Delle Ricerche, Via Roberto Cozzi 53, Milan, 20125, Italy
CNR, Ist Geol Ambientale & Geoingegneria, Via Roberto Cozzi 53, I-20125 Milan, Italy
Gonzalez-Partida, Eduardo:
Centro de Geociencias, Universidad Nacional Autónoma de México, Juriquilla, Querétaro, 76230, Mexico
Univ Nacl Autonoma Mexico, Ctr Geociencias, Juriquilla 76230, Queretaro, Mexico
Ramon Avellan, Denis:
CONACYT - Instituto de Geofísica, Universidad Nacional Autónoma de México, Antigua Carretera a Pátzcuaro 8701, Morelia, Michoacán, 58190, Mexico
Univ Nacl Autonoma Mexico, CONACYT, Inst Geofis, Antigua Carretera Patzcuaro 8701, Morelia 58190, Michoacan, Mexico
Maciás J.L.:
Instituto de Geofísica - Unidad Michoacán, Universidad Nacional Autónoma de México, Antigua Carretera a Pátzcuaro 8701, Morelia, Michoacán, 58190, Mexico
Bär K.:
Department of Geothermal Science and Technology, Technische Universität Darmstadt, Schnittspahnstraße 9, Darmstadt, 64287, Germany
Sass, Ingo:
Department of Geothermal Science and Technology, Technische Universität Darmstadt, Schnittspahnstraße 9, Darmstadt, 64287, Germany
Darmstadt Graduate School of Excellence Energy Science and Engineering, Jovanka-Bontschits Straße 2, Darmstadt, 64287, Germany
Tech Univ Darmstadt, Dept Geothermal Sci & Technol, Schnittspahnstr 9, D-64287 Darmstadt, Germany
Darmstadt Grad Sch Excellence Energy Sci & Engn, Jovanka Bontschits Str 2, D-64287 Darmstadt, Germany
Univ Nacl Autonoma Mexico, Unidad Michoacan, Inst Geofis, Antigua Carretera Patzcuaro 8701, Morelia 58190, Michoacan, Mexico
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