TU Darmstadt / ULB / TUprints

Petrophysical characterization of the Los Humeros geothermal field (Mexico): from outcrop to parametrization of a 3D geological model

Weydt, Leandra M. ; Bär, Kristian ; Sass, Ingo (2022)
Petrophysical characterization of the Los Humeros geothermal field (Mexico): from outcrop to parametrization of a 3D geological model.
In: Geothermal Energy, 2022, 10
doi: 10.26083/tuprints-00021460
Article, Secondary publication, Publisher's Version

[img] Text
Copyright Information: CC BY 4.0 International - Creative Commons, Attribution.

Download (8MB)
Item Type: Article
Type of entry: Secondary publication
Title: Petrophysical characterization of the Los Humeros geothermal field (Mexico): from outcrop to parametrization of a 3D geological model
Language: English
Date: 2022
Place of Publication: Darmstadt
Year of primary publication: 2022
Publisher: Springer
Journal or Publication Title: Geothermal Energy
Volume of the journal: 10
Collation: 48 Seiten
DOI: 10.26083/tuprints-00021460
Corresponding Links:
Origin: Secondary publication via sponsored Golden Open Access

The Los Humeros Volcanic Complex has been characterized as a suitable target for developing a super-hot geothermal system (> 350 °C). For the interpretation of geophysical data, the development and parametrization of numerical geological models, an extensive outcrop analogue study was performed to characterize all relevant key units from the basement to the cap rock regarding their petrophysical properties, mineralogy, and geochemistry. In total, 226 samples were collected and analyzed for petrophysical and thermophysical properties as well as sonic wave velocities and magnetic susceptibility. An extensive rock property database was created and more than 20 lithostratigraphic units and subunits with distinct properties were defined. Thereby, the basement rocks feature low matrix porosities (< 5%) and permeabilities (< 10⁻¹⁷ m²), but high thermal conductivities (2–5 W m⁻¹ K⁻¹) and diffusivities (≤ 4·10⁻⁶ m²s⁻¹) as well as high sonic wave velocities (≥ 5800 m s⁻¹). Basaltic to dacitic lavas feature matrix porosities and permeabilities in the range of < 2–30% and 10⁻¹⁸–10⁻¹⁴ m², respectively, as well as intermediate to low thermal properties and sonic wave velocities. The pyroclastic rocks show the highest variability with respect to bulk density, matrix porosity (~ 4– > 60%) and permeability (10⁻¹⁸–10⁻¹³ m²), but feature overall very low thermal conductivities (< 0.5 W m⁻¹ K⁻¹) and sonic wave velocities (~ 1500–2400 m s⁻¹). Specific heat capacity shows comparatively small variations throughout the dataset (~ 700–880 J kg⁻¹ K⁻¹), while magnetic susceptibility varies over more than four orders of magnitude showing formation-related trends (10⁻⁶–10⁻¹ SI). By applying empirical correction functions, this study provides a full physiochemical characterization of the Los Humeros geothermal field and improves the understanding of the hydraulic and thermomechanical behavior of target formations in super-hot geothermal systems related to volcanic settings, the relationships between different rock properties, and their probability, whose understanding is crucial for the parametrization of 3D geological models.

Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-214604
Additional Information:

Keywords: Super-hot geothermal systems, Los Humeros geothermal field, Reservoir characterization, Petrophysical and thermophysical properties, Sonic wave velocities, Magnetic susceptibility

Classification DDC: 500 Science and mathematics > 550 Earth sciences and geology
Divisions: 11 Department of Materials and Earth Sciences > Earth Science > Geothermal Science and Technology
Date Deposited: 02 Jun 2022 11:09
Last Modified: 22 Aug 2022 09:07
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/21460
PPN: 495283088
Actions (login required)
View Item View Item