Structural model and slip-dilation tendency analysis at the Copahue geothermal system: Inferences on the reservoir geometry

Barcelona, Hernán; Yagupsky, Daniel; Vigide, Nicolás C.; Senger, Martin

doi:10.1016/j.jvolgeores.2019.03.007

Cited by 26 publications

(15 citation statements)

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“…The original definition of fracture susceptibility by Streit & Hillis (2004) was concerned with safe injection limits for CO2 in potential reservoirs in Australia. Moeck et al (2009) used slip tendency to quantify the relative stability of different fault sets in different horizons in a geothermal reservoir in the North German Basin, and Barcelona et al (2019) used a similar method for Copahue geothermal reservoir in Argentina. For CCS, Williams et al, (2016Williams et al, ( , 2018 have used slip tendency analyses of faults in potential sandstone reservoirs on the UK continental shelf, including the North Sea and East Irish Sea basins.…”

Section: Importance and Previous Workmentioning

confidence: 99%

De-risking the energy transition by quantifying the uncertainties in fault stability

Healy¹,

Hicks²

2022

Preprint

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The operations needed to decarbonise our energy systems increasingly involve faulted rocks in the subsurface. To manage the technical challenges presented by these rocks and the justifiable public concern over induced seismicity, we need to assess the risks. Widely used measures for fault stability, including slip and dilation tendency and fracture susceptibility, can be combined with Response Surface Methodology from engineering and Monte Carlo simulations to produce statistically viable ensembles for the analysis of probability. In this paper, we describe the implementation of this approach using custom-built open source Python code (pfs – probability of fault slip). The technique is then illustrated using two synthetic datasets and two case studies drawn from active or potential sites for geothermal energy in the UK, and discussed in the light of induced seismicity focal mechanisms. The analysis of probability highlights key gaps in our knowledge of the stress field, fluid pressures and rock properties. Scope exists to develop, integrate and exploit citizen science projects to generate more and better data, and simultaneously include the public in the necessary discussions about hazard and risk.

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Section: Importance and Previous Workmentioning

confidence: 99%

De-risking the energy transition by quantifying the uncertainties in fault stability

Healy¹,

Hicks²

2022

Preprint

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“…Here, a trans-tensional-NE 53 transfer zone is developed, linking the LOFS and the Antiñir-Copahue Fault System (e.g. Sielfeld 54 et al, 2017).The geothermal area of interest lies to the north and northwest of the Copahue volcanic 56 edifice, with several surface emissions including fumaroles, bubbling pools, mud pools and thermal 57 springs, which are spatially associated with local extensional faults which act as fluid preferential 58 pathways (Nakanishi et al, 1995;Melnick et al, 2006;Barcelona et al, 2019). The area has been 59 studied extensively over the last thirty years, and, in the early 1990s, the Japanese International 60 Cooperation Agency (JICA) carried out a deep drilling campaign and a feasibility study for 61 developing a high-enthalpy geothermal field.…”

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“…3 1. INTRODUCTION 48 Barcelona et al, 2019;2020) -which affect the ignimbrites of the Las Mellizas volcanic sequence 95 (JICA, 1992; Barcelona et al, 2020). Five active geothermal zones are recognized within the area, 96 with evident surface manifestations consisting of hot springs, boiling pools, bubbling pools, and 97 mud pools with temperatures of up to 96°C, and fumaroles that reach temperatures of up to 135°C 98 (Agusto et al, 2013).…”

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confidence: 99%

“…Termas de Copahue (TC), Cabañita (CB), and Anfiteatro (AF) are located northeast of the volcano 100 and appear to be spatially associated with NE-and WNW-striking fault systems (Melnick et al, 101 2006; Barcelona et al, 2019). The Chancho-có (CC) geothermal field is located on the northern 102 flank of the volcano, in the WNW-striking Chancho-có Fault, in close proximity to the volcanic-103 hydrothermal system.…”

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“…The complex fault systems interaction, under an extensional 105 stress field, defines a NE-striking fault with high dilation tendency, while the WNW-striking faults 106 are related to medium to low dilation tendency (Barcelona et al, 2019). This fault architecture 107 controls the permeability and pathways of the hydrothermal fluids and meteoric water, and their 108 isotopic and chemical variations (Barcelona et al, 2019). 109…”

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Structural control on shallow hydrogeochemical processes at Caviahue-Copahue Volcanic Complex (CCVC), Argentina

Tardani

Roulleau

Pinti

et al. 2021

Journal of Volcanology and Geothermal Research

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The Caviahue-Copahue Volcanic Complex (CCVC) hosts one of Argentina's most 25 important geothermal systems. To provide new insights into origin, circulation, and residence time 26 of fluids, the chemical and isotopic composition ( 3 He/ 4 He, δ 2 H-δ 18 O in H2O; δ 13 C-δ 18 O in CO2; 27 87 Sr/ 86 Sr) of thermal waters was measured together with the 3 H and 14 C activities. Water samples 28 were collected from hot springs (LM, TC, LMM, CB and AF) representing the five major thermal 29 zones of the CCVC and assumed to be steam-heated meteoric waters, and a well condensate (COP-30 2). The LMM, CB, and AF chemical composition and 87 Sr/ 86 Sr ratios show that water chemistry is 31 acquired locally from exchange with volcanic rocks (Sr, SiO2, among others) and from steam (H2S). 32 Two surface geothermal manifestations (LM and TC), along with the well condensate, COP-2, 33 contain a higher contribution of deep-originating fluids, with 87 Sr/ 86 Sr indicating possible 34 contribution from deep-seated granitoids or sediments from the underlying basement. 35Radiocarbon-based residence times indicate ages ranging between 13,540 and 17,520 yrs BP, 36 representing the minimum age for the geothermal reservoir waters. Tritium is mainly absent in hot 37 spring waters except for LMM and CB where the activity is close to the detection limit. This 38 indicates a minimum age older than 70 yrs for the water circulating in the shallow circuit. This 39 result suggests that shallow meteoric water have a more complex and/or deeper circuit, resulting 40 in older residence times. Helium isotopes in the CCVC span a wide range, from a pure mantle-41 derived value, of 8.35Ra, to a more crustal radiogenic signature, of 4.6Ra. The spatial variation is 42 explained by associating the geochemical data with the geological context, which includes the 43 distribution of fault-fracture meshes and different sources of magmatic volatiles underlying the 44Copahue volcano. The first order control on helium isotope signatures observed in this study seems 45 to be dominated by the degree of crustal assimilation of the magmatic sources, which is in turn 46 controlled by the local arrays of faults.The Copahue stratovolcano, part of the Caviahue-Copahue Volcanic Complex (CCVC), is 49 an active volcano that hosts a high-enthalpy geothermal system (JICA, 1992) that represents a 50 promising resource for geothermal energy in Argentina (Barcelona et al., 2020). The CCVC is 51 located in the Southern Volcanic Zone (SVZ, 33 -46 ° S) of the Andes, at the northern termination 52 of the intra-arc, strike-slip, Liquiñe-Ofqui Fault System (LOFS). Here, a trans-tensional-NE 53 transfer zone is developed, linking the LOFS and the Antiñir-Copahue Fault System (e.g. Sielfeld 54 et al, 2017).The geothermal area of interest lies to the north and northwest of the Copahue volcanic 56 edifice, with several surface emissions including fumaroles, bubbling pools, mud pools and thermal 57 springs, which are spatially associated with local extensional faults which act as fluid p...

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Hydrogeochemistry of an Acid River and Lake Related to an Active Volcano. The Case of Study: Agrio River—Copahue Volcano in Patagonia, Argentina

Llano

Lamberti

Sierra

et al. 2021

Environmental Assessment of Patagonia's Water Resources

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Structural model and slip-dilation tendency analysis at the Copahue geothermal system: Inferences on the reservoir geometry

Cited by 26 publications

References 56 publications

De-risking the energy transition by quantifying the uncertainties in fault stability

De-risking the energy transition by quantifying the uncertainties in fault stability

Structural control on shallow hydrogeochemical processes at Caviahue-Copahue Volcanic Complex (CCVC), Argentina

Hydrogeochemistry of an Acid River and Lake Related to an Active Volcano. The Case of Study: Agrio River—Copahue Volcano in Patagonia, Argentina

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