Bastien Dupuy

SINTEF | Stiftelsen for industriell og teknisk forskning

The goal of the workshop was to explore innovative applications of Uncrewed Aerial Systems (UAS) in the context of avalanche risk assessment, avalanche control and prevention, as well as for search and rescue. The workshop constituted also the final seminar of the GEOSFAIR project.

The cryosphere is strongly impacted by climate change and the cryosphere response is a dreadful example of the climate change influence on Earth. Monitoring of the snow cover is highly relevant for numerous applications including avalanche hazard assessment, water supply, flood and debris flow forecasting, glacier mass balance and hydropower indust...

Large-scale CO 2 and energy storage is a mandatory part of the green shift to reduce CO 2 emissions and limit consequences of climate change. Large-scale storage will require the use of shut-down depleted hydrocarbon fields to take advantage of well-characterized reservoirs and cap rocks. Thanks to extensive data from historical hydrocarbon product...

Uncrewed aerial vehicles (UAVs) are increasingly used to monitor snow conditions. Routine operational use by roadway owning organisations for avalanche risk assessments require an understanding of UAV and sensor technology as well as of relevant organisational aspects. To investigate these areas, the Norwegian public-sector innovation project "Geoh...

Carbon capture and storage (CCS) is an inevitable action to achieve CO2 emission reduction targets including becoming net-zero by 2050. Increased efforts are therefore required to identify suitable locations for large-scale CO2 storage. In addition to large aquifers, shut down oil and gas fields in the North Sea are logical candidates for offshore...

We describe and evaluate a methodology combining high‐resolution seismic waveform tomography and rock physics inversion to monitor the CO 2 plume at Sleipner. For geophysical monitoring, we derive P‐wave velocity by applying Full‐Waveform Inversion (FWI) to both baseline and monitor data. We then infer selected rock physics parameters using a Rock...

More than 750 wildcat wells have been drilled in the Norwegian North Sea since 1966. Some of these wells could pose a risk for the environment, climate, and future CO2 and hydrogen storage projects by being potential leakage pathways for subsurface gases (mainly CH4 and stored CO2 and hydrogen). To ensure well integrity, these wells were secured by...

Risk assessment of CO 2 storage requires the use of geophysical monitoring techniques to quantify changes in selected reservoir properties such as CO 2 saturation, pore pressure and porosity. Conformance monitoring and associated decision-making rest upon the quantified properties derived from geophysical data, with uncertainty assessment. A genera...

The three-year (2017-2020) Pre-ACT project was established as one of the three large projects in the first round of the Accelerating CCS Technologies (ACT) program (https://act-ccs.eu). Pre-ACT was a collaborative effort between partners from six research institutes and four companies with an active role in CCS. The project ambition was to deliver...

Safe CO2 storage requires conformance verification, i.e. confirmation that the pressure and CO2 accumulation are consistent with modelling forecasts within a given uncertainty range. Quantitative estimates of relevant reservoir parameters (e.g. pore pressure and fluid saturations) are usually derived from geophysical monitoring data (e.g. seismic,...

Combining monitoring data and reservoir simulations of CO 2 storage sites is crucial for improving our understanding of a site, verifying conformance and allowing us to utilise fully all available data. In this way we can include relevant flow physics in our quantitative interpretations of monitoring data and constrain our simulations so they are c...

Depletion or injection into a reservoir implies stress changes and strains in the reservoir and its surroundings. This may lead to measurable time‐shifts for seismic waves propagating in the subsurface. To better understand the offset dependence of time‐shifts in the overburden, we have systematically quantified the time‐shifts of three different o...

CO2 saturations are estimated at Sleipner using a two‐step imaging workflow. The workflow combines seismic tomography (full‐waveform inversion) and rock physics inversion and is applied to a 2D seismic line located near the injection point at Sleipner. We use baseline data (1994 vintage, before CO2 injection) and monitor data which was acquired aft...

Reliable quantification of carbon dioxide properties and saturation is crucial for monitoring of CO2 underground storage projects. This paper focuses on quantitative seismic characterization of CO2 at Sleipner storage pilot. We evaluate a methodology combining high-resolution seismic waveform tomography, with uncertainty quantification and rock phy...

A feasibility study of inverting for CO2 elastic properties using a model based AVO inversion is carried out. We use principal component analysis on a set of PP reflection coefficients to calculate an optimal basis function for the AVO response of the CO2 plume. The method is applied to the marine seismic data recorded on the CO2 storage site at Sl...

We propose an innovative approach to calculate pore pressure from seismic velocities using Biot-Gassmann theory and Skempton coefficient. The first synthetic tests on North Sea overpressured shales show reliable results which are close to the pore pressure estimated with conventional empirical Bowers formula. The new method is promising as it does...

The estimation of quantitative rock physics properties is of great importance for reservoir characterization and monitoring in CO2 storage or enhanced oil recovery as an example.We have combined the high-resolution results of full-waveform inversion (FWI) methods with rock physics inversion. Because we consider a generic and dynamic rock physics mo...

The quantitative estimation of rock physics properties is of great importance in any reservoir characterization. We have studied the sensitivity of such poroelastic rock physics properties to various seismic viscoelastic attributes (velocities, quality factors, and density). Because we considered a generalized dynamic poroelastic model, our analysi...

Extracting detailed earth information from an ensemble of seismic traces is a challenge facing full-waveform inversion. So far, success on synthetic and real data has been accomplished primarily for the twin purposes of complex structural imaging and geologic interpretation. An ongoing issue for the seismic-imaging community, in addition to buildin...

Based on analytic relations, we compute the reflection and transmission responses of a periodically layered medium with a stack of elastic shales and partially saturated sands. The sand layers are considered anelastic (using patchy saturation theory) or elastic (with effective velocity). Using the patchy saturation theory, we introduce a velocity d...

We consider the mix of two scales of periodicity in a finely layered system: the layering itself which carries a strong macroscopic frequency dependence and the partial saturation of sands layers. These layers are patchy saturated, and the P-waves have strong dispersion due to mesoscale wave-induced flow phenomena. We choose three porosity models t...

We consider the mix of two scales of periodicity in a finely layered system: the layering itself which carries a strong macroscopic frequency dependence and the partial saturation of sands layers. These layers are patchy saturated, and the P-waves have strong dispersion due to mesoscale wave-induced flow phenomena. We choose three porosity models t...

Time lapse seismic data has been acquired for the monitoring of an underground blow-out. Using time-lapse FWI techniques, we obtain P-wave velocity images for baseline (before the blow-out) and monitor models (after). The difference between both velocities is about 100 m/s in a 480 m deep sand layer. Using poroelastic Biot-Gassmann based relations...

Partially saturated rocks are considered to be major sources of seismic wave velocity dispersion and attenuation in recorded real data. From the physical description of partially saturated gas-water and oil-water reservoirs, we use upscaling theories to compute an equivalent frequency-dependent porous medium. These homogenization methods are associ...

Partially saturated rocks are considered to be major sources of seismic wave velocity dispersion and attenuation in recorded real data. From the physical description of partially saturated gas-water reservoirs, we use upscaling theories to compute an equivalent frequency-dependent porous medium. These homogenization methods are associated with meso...

Full waveform inversion (FWI) of seismic traces recorded at the free surface allows the reconstruction of the physical parameters structure on the underlying medium. For such a reconstruction, an optimization problem is defined, where synthetic traces, obtained through numerical techniques as finite-difference or finite-element methods in a given m...

The quantitative imaging of the Earth subsurface is a major challenge in geophysics. In oil and gas exploration and production, aquifer management and other applications such as the underground storage of CO2 , seismic imaging techniques are implemented to provide as much information as possible on fluid-filled reservoir rocks. Biot theory (Biot, 1...

Seismic wave propagation is often used for subsurface investigation, related either to reservoir issues (oil, gas or CO2 storage) or geotechnical problems (slope stability, water resources, territory management). Indeed, near surface media are rather heterogeneous, complex and partially fluid-filled. These characteristics are more or less sensitive...

Seismic wave propagation in multiphasic porous media have various environmental (natural risks, geotechnics, groundwater pollutions...) and ressources (aquifers, oil and gas, CO2 storage...) issues. When seismic waves are crossing a given material, they are distorted and thus contain information on fluid and solid phases. This work focuses on the c...

Full waveform inversion (FWI) of seismic traces recorded at the free surface allows the reconstruction of the physical parameters structure on the underlying medium. Our two main objectives are the reconstruction of multiple classes of parameters on one side and the formulation of both the acoustic and elastic FWI for 3D geometries. A quasi-Newtoni...

Biphasic media with a dynamic interaction between fluid and solid phases must be taken into account to accurately describe seismic wave amplitudes in subsurface and reservoir geophysical applications. Consequently, the modeling of the wave propagation in heteregeneous porous media, which includes the frequency-dependent phenomena of the fluidsolid...

Seismic wave propagation in heterogenous 2D porous media have to be considered for subsurface investigation, related either to reservoir issues (oil, gas or CO2 storage) or geotechnical problems (slope stability, water resources). Indeed, taking into account the biphasic constitution of the medium and the dynamic interaction between fluid and solid...