Results of a 3D seismic survey at the Travale (Italy) test site

Casini, Michele; Ciuffi, Simonetta; Fiordelisi, A.; Mazzotti, Alfredo; Stucchi, E.

doi:10.1016/j.geothermics.2009.11.003

Cited by 34 publications

(18 citation statements)

References 3 publications

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“…Lüschen et al (2014) point out that the short history of 3D seismic surveys for geothermal exploration is in sharp contrast to the oil and gas industry, where the technology is well adopted. One of the first large-scale (>33 km 2 ) 3D seismic surveys for geothermal exploration was performed in 2003 by the Ente Nazionale per l'Energia Elettrica (ENEL) at the Lardello-Travale geothermal area in southern Tuscany, Italy (Casini et al 2010). Fractured zones within the deep geothermal reservoir were identified and characterized.…”

Section: Introductionmentioning

confidence: 99%

Temporal evolution of fault systems in the Upper Jurassic of the Central German Molasse Basin: case study Unterhaching

Budach

Moeck

Lüschen

et al. 2017

Int J Earth Sci (Geol Rundsch)

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Section: Introductionmentioning

confidence: 99%

Temporal evolution of fault systems in the Upper Jurassic of the Central German Molasse Basin: case study Unterhaching

Budach

Moeck

Lüschen

et al. 2017

Int J Earth Sci (Geol Rundsch)

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“…The Larderello-Travale geothermal field is located in southern Tuscany, in a region known for centuries for its mines and, more recently, for the exploitation of endogenous fluids which are localized in fracture systems inside the reservoir rocks (Casini et al 2010).…”

Section: Introductionmentioning

confidence: 99%

A feasibility study on the expected seismic AVA signatures of deep fractured geothermal reservoirs in an intrusive basement

Aleardi

Mazzotti

2014

J. Geophys. Eng.

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The deep geothermal reservoirs in the Larderello-Travale field (southern Tuscany) are found in intensively fractured portions of intrusive/metamorphic rocks. Therefore, the geothermal exploration has been in search of possible fracture signatures that could be retrieved from the analysis of geophysical data. In the present work we assess the feasibility of finding seismic markers in the pre-stack domain which may pinpoint fractured levels. Thanks to the availability of data from boreholes that ENEL GreenPower drilled in the deep intrusive basement of this geothermal field, we derived the expected amplitude versus angle (AVA) responses of the vapour reservoirs found in some intensely, but very localized, fractured volumes within the massive rocks. The information we have available limit us to build 1D elastic and isotropic models only and thus anisotropy effects related to the presence of fractures cannot be properly modelled.We analysed the velocities and the density logs pertaining to three wells which reached five deep fractured zones in the basement. The AVA response of the fractured intervals is modelled downscaling the log data to seismic scale and comparing the analytical AVA response (computed with the Aki and Richards approximation) and the AVA extracted from a synthetic common mid point (calculated making use of a reflectivity algorithm). The results show that the amplitude of the reflections from the fractured level is characterized by negative values at vertical incidence and by decreasing absolute amplitudes with the increase of the source to receiver offset. This contrasts with many observations from hydrocarbon exploration in clastic reservoirs where gas-sand reflections often exhibit negative amplitudes at short offsets but increasing absolute amplitudes for increasing source to receiver offsets. Thereby, some common AVA attributes considered in silicoclastic lithologies would lead to erroneous fracture localization. For this reason we propose a modified AVA indicator which may highlight fracture locations in this peculiar rock type.

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“…Other examples are discussed in Casini et al . () who performed post‐stack time migration to the three‐dimensional (3D) seismic data from the Travale geothermal field, and in Giustiniani, Tinivella and Nicolich () who carried out the post‐stack time migration of CROP seismic lines. Some of the previous works have also tried to obtain the seismic images of the K‐Horizon in the depth domain.…”

Section: K‐horizon and Previous Workmentioning

confidence: 99%

Advanced three‐dimensional seismic imaging of deep supercritical geothermal rocks in Southern Tuscany

Jusri

Bertani

Buske

2019

Geophysical Prospecting

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A B S T R A C TThe seismic K-Horizon is the key to gaining understanding on the deep supercritical geothermal rocks in Southern Tuscany. The K-Horizon is hosted in metamorphic rocks, which cause strong seismic wavefield scattering resulting in a poor signal-to-noise ratio. Our study aims to reveal high-resolution seismic images of the K-Horizon below a geothermal field in Southern Tuscany, using an advanced threedimensional seismic depth imaging approach. The key seismic pre-processing steps in the time domain include muting a large amount of persistent noise based on the statistical analysis of the seismic amplitudes, and tomostatics technique to correct for static effects. We carried out seismic depth imaging using Kirchhoff Pre-Stack Depth Migration and Fresnel Volume Migration techniques. Each migration technique was tested with constant and heterogeneous three-dimensional velocity models. Due to the difficulties in determining emergent angles for this low signal-to-noise ratio data set, the migration results with the heterogeneous three-dimensional velocity model show less coherent reflections compared to the migration results using the constant velocity model. Both velocity models however lead to relatively the same structure and depth of the K-Horizon, indicating the similarity of the average velocities along the wave propagation paths in both velocity models. With both velocity models Fresnel Volume Migration yields the K-Horizon with better reflection coherency and higher signal-to-noise ratio than standard Kirchhoff Pre-Stack Depth Migration. Nevertheless, both migration techniques have been able to reveal the K-Horizon with relatively high resolution and provide a reliable basis for geothermal rock characterization as well as steering of the first geothermal well penetrating the K-Horizon.

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Results of a 3D seismic survey at the Travale (Italy) test site

Cited by 34 publications

References 3 publications

Temporal evolution of fault systems in the Upper Jurassic of the Central German Molasse Basin: case study Unterhaching

Temporal evolution of fault systems in the Upper Jurassic of the Central German Molasse Basin: case study Unterhaching

A feasibility study on the expected seismic AVA signatures of deep fractured geothermal reservoirs in an intrusive basement

Advanced three‐dimensional seismic imaging of deep supercritical geothermal rocks in Southern Tuscany

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