Integrated seismic ambient noise, magnetotellurics and gravity data for the 2D interpretation of the Vallès basin structure in the geothermal system of La Garriga-Samalús (NE Spain)

Mitjanas, Gemma; Ledo, Juanjo; Macau, Albert; Alías, Gemma; Queralt, Pilar; Bellmunt, F.; Rivero, L.; Gabàs, A.; Marcuello, Álex; Benjumea, Beatriz; Martí, Anna; Figueras, Sara

doi:10.1016/j.geothermics.2021.102067

Cited by 17 publications

(5 citation statements)

References 67 publications

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“…Reconstruction of the geological setting of a thermal system is one of the steps necessary for assessing the potential of a geothermal resource. Geophysical investigations have been profitably used to address this topic since their results can be used to indirectly reconstruct the geometry of the reservoir and of the fault systems driving the fluid circulation [19,[22][23][24]39,[61][62][63]71,72]. These methods are particularly applicable in areas where the geological data are limited to a few stratigraphic logs or where the alluvial cover conceals the subsurface structure.…”

Section: Discussionmentioning

confidence: 99%

“…An integrated approach based on the passive horizontal to vertical spectral ratio (HVSR) and the active multichannel analysis of surface waves (MASW) methods was applied to map the thickness of the Quaternary cover in the Daruvar spring area. Similar methodological approaches have been used in thermal areas where recent sediments conceal the geometry of the bedrock [39,[70][71][72].…”

Section: Seismic Investigationsmentioning

confidence: 99%

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Reconstruction of Fault Architecture in the Natural Thermal Spring Area of Daruvar Hydrothermal System Using Surface Geophysical Investigations (Croatia)

et al. 2023

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The sustainable utilization of geothermal energy mostly depends on the characteristics of the geothermal resource from which it is extracted. Among others, detailed geological modeling is a key factor for estimating the potential of a geothermal resource. This research focuses on the modeling and reconstruction of the geological setting of the Daruvar thermal spring area using geophysical techniques. An integrated geophysical approach based on electrical resistivity tomography (ERT) and both active and passive seismic (MASW and HVSR) methods was used. Based on ERT results and the stratigraphic logs of the wells in Daruvar, three resistivity layers/geological units were identified. The deepest layer with resistivity < 150 Ωm is the Triassic carbonate that constitutes the thermal aquifer. Sharp lateral variations in the resistivity distributions within the bedrock were interpreted as fault damage zones saturated with thermal waters. Integrating the results of the seismic methods, the thickness of the first seismic layer that corresponds to the Quaternary cover was estimated from 5 to 20 m. Here, results of the geophysical investigations were combined into a 3D geological model highlighting the occurrence of subvertical N-S and E-W trending faults in the Daruvar spring area. The N-S-trending fault was interpreted as a fault plane parallel to the regionally mapped Daruvar fault. This fault juxtaposes the Triassic carbonate complex of the thermal aquifer with a Neogene sedimentary sequence of significantly lower permeability. Neogene–Quaternary tectonic activity further increased the fracturing and the permeability field in the Daruvar spring area, as proven by the smaller scale E-W faults and the well logs. This fracture network permits a quick upwelling of thermal fluids resulting in thermal springs with temperatures up to 50 °C. This work proves that the construction of a detailed geological model is crucial for assessing the reservoir and fault geometries in thermal systems hosted in fractured carbonate rocks.

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Section: Discussionmentioning

confidence: 99%

Section: Seismic Investigationsmentioning

confidence: 99%

Reconstruction of Fault Architecture in the Natural Thermal Spring Area of Daruvar Hydrothermal System Using Surface Geophysical Investigations (Croatia)

et al. 2023

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“…The construction of valid and reliable geological models requires the integration of both geological and geophysical data. Numerous studies have demonstrated the effectiveness of combining multiple geophysical techniques with geological data to constrain geological models (e.g., Ayala et al, 2022;Mitjanas et al, 2021;Henke et al, 2020;Le Pape et al, 2017;Pous et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

High-Resolution Scan of the Pyrenean Crustal Structure Combining Magnetotelluric and Gravity Data

Piña-Varas

Soto²,

Clariana³

et al. 2023

Preprint

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“…The magnetotelluric (MT) method is commonly employed to investigate deep geothermal resources as it can characterize the electrical resistivity of deep geothermal system structures [1][2][3][4]. Over the last decades, much research has focused on 3D MT modeling and the development of 3D MT inversion codes (e.g., [5][6][7][8][9][10][11][12][13][14]).…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Magnetotelluric Characterization of the Travale Geothermal Field (Italy)

et al. 2022

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The geoelectrical features of the Travale geothermal field (Italy), one of the most productive geothermal fields in the world, have been investigated by means of three-dimensional (3D) magnetotelluric (MT) data inversion. This study presents the first resistivity model of the Travale geothermal field derived from derivative-based 3D MT inversion. We analyzed MT data that have been acquired in Travale over the past decades in order to determine its geoelectrical dimensionality, directionality, and phase tensor properties. We selected data from 51 MT sites for 3D inversion. We carried out a number of 3D MT inversion tests by changing the type of data to be inverted, the inclusion of static-shift correction at some sites where new time-domain electromagnetic soundings (TDEM) were acquired, the grid rotation, as well as the starting model in order to assess the connection between the inversion model and the geology. The final 3D model herein presents deep elongated resistive bodies between the depths of 1.5 and 8 km. They are transverse to the Apennine structures and suggest a correlation with the strike-slip tectonics. Comparison with a seismic velocity model and well log data suggests a highly-fractured volume of rocks with vapor-dominated circulation. The outcome of this study provides new insights into the complex geothermal system of Travale.

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Integrated seismic ambient noise, magnetotellurics and gravity data for the 2D interpretation of the Vallès basin structure in the geothermal system of La Garriga-Samalús (NE Spain)

Cited by 17 publications

References 67 publications

Reconstruction of Fault Architecture in the Natural Thermal Spring Area of Daruvar Hydrothermal System Using Surface Geophysical Investigations (Croatia)

Reconstruction of Fault Architecture in the Natural Thermal Spring Area of Daruvar Hydrothermal System Using Surface Geophysical Investigations (Croatia)

High-Resolution Scan of the Pyrenean Crustal Structure Combining Magnetotelluric and Gravity Data

Three-Dimensional Magnetotelluric Characterization of the Travale Geothermal Field (Italy)

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