Petrophysical and mechanical rock property database of the Los Humeros and Acoculco geothermal fields (Mexico)
L. Weydt,Ángel Andrés Ramírez-Guzmán,A. Pola,Baptiste Lepillier,Juliane Kummerow,Giuseppe Mandrone,Cesare Comina,Paromita Deb,Gianluca Norini,Eduardo Gonzalez-Partida,Denis Ramón Avellán,José Luis Macías,Kristian Bär,Ingo Sass +13 more
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TLDR
Weydt et al. as discussed by the authors developed a new workflow to overcome the gap of knowledge of the reservoir properties, which is used for the interpretation of geophysical data and the parameterization of numerical models and thus are the basis for economic reservoir assessment.Abstract:
. 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/tudatalib-201.10 ), 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.read more
Citations
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Journal ArticleDOI
The mechanical behaviour and failure modes of volcanic rocks: a review
Michael J. Heap,Marie Violay +1 more
TL;DR: A review of recent developments in the understanding of the mechanical behavior and failure modes of volcanic rocks can be found in this article, where the effective pressure required for the onset of hydrostatic inelastic compaction in volcanic rocks decreases as a function of increasing porosity.
Peer ReviewDOI
Machine learning in subsurface geothermal energy: Two decades in review
Esuru Rita Okoroafor,Connor Smith,K. Ochie,Chinedu Joseph Nwosu,Halldora Gudmundsdottir,M. (Jabs) Aljubran +5 more
Journal ArticleDOI
An approach to reconstruct the thermal history in active magmatic systems: Implications for the Los Humeros volcanic complex, Mexico
TL;DR: In this article, the authors presented a methodology for thermal assessment in active volcanic systems, whereby field-based geological, geochemical and petrological data are integrated to define the transient heat sources of a magma plumbing system.
Journal ArticleDOI
Database of petrophysical properties of the Mid-German Crystalline Rise
TL;DR: Weinert et al. as discussed by the authors presented a database of petrophysical properties of the mid-German crystalline rise, measured on 224 locations in Bavaria, Hessen, and Thuringia and comprising 26,951 single data points.
Journal ArticleDOI
The tensile strength of hydrothermally altered volcanic rocks
Michael J. Heap,Claire E. Harnett,Fabian B. Wadsworth,H. Albert Gilg,Lucille Carbillet,Marina Rosas-Carbajal,Jean-Christophe Komorowski,Patrick Baud,Valentin R. Troll,Frances M. Deegan,Eoghan P. Holohan,Roberto Moretti +11 more
TL;DR: In this paper , the authors measured the tensile strength of variably altered volcanic rocks, quantified as the weight percentage of secondary (alteration) minerals, varied from 6 to 62.8 wt%.
References
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Ki-iti Horai,Junichi Susaki +1 more
TL;DR: In this paper, the effect of high pressure up to 12 kbar on thermal conductivity of silicate rocks was determined by the transient hot wire method on 23 samples, with the exception of one sedimentary rock, one meteorite and manufactured fused and crystalline quartz.
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Journal ArticleDOI
Structural analysis and thermal remote sensing of the Los Humeros Volcanic Complex: Implications for volcano structure and geothermal exploration
Gianluca Norini,Gianluca Groppelli,Roberto Sulpizio,Gerardo Carrasco-Núñez,Pablo Dávila-Harris,C. Pellicioli,Francesco Zucca,R. de Franco +7 more
TL;DR: In this paper, a structural analysis of the Los Humeros Volcanic Complex (LHVC) is presented, focused on Quaternary tectonic and volcano-tectonic features, including the areal distribution of monogenetic volcanic centers.
Journal ArticleDOI
Experimental investigations on the thermal conductivity characteristics of Beishan granitic rocks for China's HLW disposal
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