Francesco ParisioLiveEO GmbH · SAR
Francesco Parisio
PhD
InSAR monitoring of ground deformation.
About
39
Publications
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417
Citations
Citations since 2017
Introduction
Additional affiliations
March 2019 - present
January 2017 - February 2019
August 2012 - June 2016
Education
August 2012 - June 2016
September 2009 - December 2011
September 2005 - July 2009
Publications
Publications (39)
Failure in brittle rock happens because micro-cracks in the crystal structure coalesce and form a localized fracture. The propagation of the fracture is in turn strongly influenced by dissipation in the fracture process zone. The classical theory of linear elastic fracture mechanics falls short in describing failure when the dissipation in the frac...
The numerical treatment of propagating fractures as embedded discontinuities is a challenging task for which an analyst has to select a suitable numerical method from a range of options. Since their inception in the mid-80s, smeared approaches for fracture simulation such as non-local damage, gradient damage or more lately phase-field modelling hav...
Supercritical geothermal systems are appealing sources of sustainable and carbon-free energy located in volcanic areas. Recent successes in drilling and exploration have opened new possibilities and spiked interest in this technology. Experimental and numerical studies have also confirmed the feasibility of creating fluid conducting fractures in se...
This study is focused on the modeling of the seismic response in a supercritical geothermal system subjected to a long-term cold and isothermal re-injection during 20 years of exploitation. The modeling aims to assess the usability of seismic-methods for monitoring supercritical geothermal reservoir. We use a synthetic data set for the analysis of...
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Developing high-enthalpy geothermal systems requires a sufficiently permeable formation to extract energy through fluid circulation. Injection experiments above water’s critical point have shown that fluid flow can generate a network of highly conductive tensile cracks. However, what remains unclear is the role played by fluid and solid rheology on...
Fluid injection into geological formations for energy resource development frequently induces (micro)seismicity. If intensely shaking the ground, induced earthquakes may cause injuries and/or economic loss, with the consequence of jeopardizing the operation and future development of these geoenergy projects. To achieve an improved understanding of...
In this study, we present results of an in situ stress state estimation for the Los Humeros geothermal field (Mexico) located in the eastern section of the Trans-Mexican Volcanic Belt. During more than 40 years of geothermal energy production, issues related to induced seismicity, reservoir depletion, subsidence, and wellbore stability have occurre...
Supercritical/superhot geothermal success depends on successful drilling. However, wellbore stability in supercritical environments has not been investigated because imposing sufficient stress on high-temperature granite with true triaxial loading is difficult. We conducted wellbore failure experiments on 200–450 °C granite under true triaxial stre...
In order to properly simulate complex hydrogeological or geotechnical processes it is crucial to reasonably capture the mechanical behavior of the geomaterials (soils or rocks, specifically). Mechanically speaking, a constitutive relation is needed for the calculation of the effective stress tensor as part of the constitutive closing of the thermo-...
The presence of heterogeneously distributed mineral grain boundaries introduces a characteristic length-scale leading to a size-dependent strength and toughness of brittle rocks. This study focuses on fracture nucleation and quasi-static propagation in three-point bending experiments in notched beams. We employed a variational approach to fracture...
Plain Language Summary
The subsurface will play an important role in decarbonizing the economy. The transition to carbon neutrality can be accelerated by utilizing geothermal energy, returning carbon underground, and storing energy in the subsurface to offset the fluctuations in production of renewables. These low‐carbon geoenergy technologies ofte...
Superhot geothermal environments with temperatures of approximately 400–500 °C at depths of approximately 2–4 km are attracting attention as new kind of geothermal resource. In order to effectively exploit the superhot geothermal resource through the creation of enhanced geothermal systems (superhot EGSs), hydraulic fracturing is a promising techni...
OpenGeoSys (OGS) is a scientific open-source initiative for the numerical simulation of thermo-hydro-mechanical/chemical (THMC) processes in porous and fractured media. The basic concept of OGS consist on providing a flexible numerical framework, using primarily the Finite Element Method (FEM) for solving multi-field coupled
processes with applicat...
Displaced faults crossing the reservoir could significantly increase the induced earthquake frequency in geo‐energy projects. Understanding and predicting the stress variation in such cases is essential to minimize the risk of induced seismicity. Here, we adopt the inclusion theory to develop an analytical solution for the stress response to pore p...
Plain Language Summary
Geologic carbon storage, which consists in returning carbon deep underground, should be part of the solution to effectively reach carbon neutrality by the middle of the century to mitigate climate change. CO2 has been traditionally proposed to be stored in sedimentary rock at depths below 800 m, where CO2 becomes a dense flui...
Natural phenomena such as seismicity, volcanism, and fluid circulation in volcanic areas are influenced by the mechanical response of intact basalt. When subjected to a wide range of environmental loading conditions, basalt exhibits inelastic deformation characteristics ranging from brittle to ductile behavior. In this manuscript, we present a new...
Plain Language Summary
At Acoculco, Mexico, the temperature of the rock at 2 km depth is approximately 300°C, which can be potentially exploited for the production of geothermal energy. To produce deep geothermal energy, water must be extracted from the rock, which is currently not possible in Acoculco because the host rock, a granite, is practical...
Data gathered from two geothermal exploration wells in the Acoculco caldera, within the Trans-Mexican Volcanic Belt, indicated that temperature is high enough for economic utilization, but permeability is insufficient. Hence, heat exploitation at this location may only be possible by Enhanced Geothermal System (EGS) technologies. To evaluate the po...
In every tight formation reservoir, natural fractures play an important role for mass and energy transport and stress distribution. Enhanced Geothermal Systems (EGS) make no exception and stimulation aims at increasing the reservoir permeability to enhance fluid circulation and heat transport. EGS development relies upon the complex task of predict...
Contrasting deformation mechanisms precede volcanic eruptions and control precursory signals. Density increase and high uplifts consistent with magma intrusion and pressurization are in contrast with dilatant responses and reduced surface uplifts observed before eruptions. We investigate the impact that the rheology of rocks constituting the volcan...
The disposal of highly radioactive spent nuclear fuel in deep geological media will require excavating a large number of galleries in low-permeable rocks, altering initial rock integrity at the repository site. The FE tunnel excavated in Opalinus Clay at the Mont Terri Underground Research Laboratory (Switzerland) is a unique full-scale experiment...
Scientific visualization developed successful methods for scalar and vector fields. For tensor fields, however, effective, interactive visualizations are still missing despite progress over the last decades. We present a general approach for the generation of separating surfaces in symmetric, second-order, three-dimensional tensor fields. These sur...
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The correct representation of the failure of geomaterials that feature strength anisotropy and polyaxiality is crucial for many applications. In this contribution, we propose and evaluate through a comparative study a generalized framework that covers both features. Polyaxiality of strength is modeled with a modified Van Eekelen approach, while the...
The concept of material or configurational forces, albeit not new, is one of those innovations in theoretical mechanics that has struggled to reach the success of wide-spread acceptance, or even familiarity. Perhaps, one reason for this is to be found in the few available introductory examples or in the non-trivial physical-mathematical approach of...
The constitutive modeling of shales is an important topic in the geomechanics community as it is often
encountered in advanced applications such as nuclear waste storage, CO2 sequestration, and unconventional oil and gas exploitation. The goal of this work is to describe, within a unique plastic-damage framework, the full mechanical behavior of sha...
Current geomechanical applications imply nonisothermal processes of unsaturated geomaterials, in most cases following stress paths different from the classical triaxial compression often used in laboratory testing. Although the effects of temperature, suction, and stress-path direction (Lode’s angle) on the strength of geomaterials have been invest...
Understanding the hydro-mechanical behavior of shale is fundamental to assess the safety of
deep geological nuclear repository sites. Several countries have adopted argillaceous
formations as host geological media for the repository. In Switzerland, the candidate for
hosting the deep geological repository site is Opalinus Clay. This thesis aims at...
Shales have become increasingly important because they play key roles in modern energy and environmental geomechanics applications, such as nuclear waste storage, non-conventional oil and gas operations and CO2 geological storage. Shale behaves in a quasi-brittle manner, often exhibiting linear elasticity before reaching its peak stress. Furthermor...
Couplings between plasticity and damage theories are seen nowadays as the best solution to solve problems related to the constitutive modeling of many shales. Such geomaterials can be characterized as quasi-brittle, i.e. They show no or negligible plastic irreversible deformations before the peak of stress is reached. In the present paper we will p...
A constitutive model that couples elastic-plastic and damage theories is developed to predict the mechanical behavior of a shale from the Mont Terri rock laboratory (Opalinus Clay). The framework of continuum damage mechanics allows to predict the degradation of the elastic parameters with strains, while the coupling with plasticity correctly repro...
Projects
Projects (4)
Experiments proved the possibility of exploiting supercritical geothermal resources in the ductile crust, demonstrating that fractures in crystalline rock are still sufficiently permeable and and that permeability enhancement through hydraulic stimulation is possible (Watanabe et al. 2017a, Watanabe et al. 2017b). At high temperature, hydrofracture network morphology changes from planar to dendritic patterns: adequate conceptual frameworks that describe these phenomena are the objective of “HIGHER”. Models for the brittle-ductile transition of rocks (Parisio et al. 2019) have been successfully employed to describe high-temperature rheology. A successful extension to describe the above mentioned experimental phenomena requires addressing several open questions relating fluid and rock rheology to fracture morphology and permeability evolution. Experiments will be conducted at Tohoku University, and, based on the experimental results, models of hydraulic fracture propagation will be developed and implemented into the open-source multi-physics finite elements code OpenGeoSys (www.opengeosys.org). The explanatory capabilities of the newly developed concepts towards intricate dynamical processes in the earth’s crust will be assessed in simulations of selected large-scale scenarios to be conducted by the German-Japanese team utilizing High Performance Computing (HPC) capabilities. This study will unravel the complex mechanisms behind fluid driven fracture formation beyond the brittle condition in the earth crust.
This ERC StG project aims at developing a novel methodology to predict and mitigate induced seismicity. Fluid injection related to underground resources has become widespread, causing numerous cases of induced seismicity. If felt, induced seismicity has a negative effect on public perception and may jeopardize wellbore stability and infrastructure, which has led to the cancellation of several projects. Therefore, forecasting injection-induced earthquakes is a big challenge that must be overcome to deploy geo-energies to significantly reduce CO2 emissions and thus mitigate climate change and reduce related health issues.
OpenGeoSys (OGS) is a scientific open source project (https://www.opengeosys.org/) for the development of numerical methods for the simulation of thermo-hydro-mechanical-chemical (THMC) processes in porous and fractured media. OGS is implemented in C++, it is object-oriented with an focus on the numerical solution of coupled multi-field problems (multi-physics). Parallel versions of OGS are available relying on both MPI and OpenMP concepts. Application areas of OGS are currently CO2 sequestration, geothermal energy, water resources management, hydrology and waste deposition. OGS is comprised of the THMC-simulator (simply referred to as OGS) and a visualization tool (Data Explorer). OGS is developed by the OpenGeoSys Community.
