Florence Delprat-Jannaud

• IFP Energies nouvelles

Oral presentation in session "Seismic Interpretation I - Automation through AI, Machine Learning, Deep Learning " of EAGE 2018

Poster presented at the SIAM-IS conference, 2018 https://www.siam-is18.dm.unibo.it/presentations/834 (last accessed 2018-10-17)

Identification and seismic mapping of mass-transport deposits (MTDs) are vital targets for marine geological studies both for a better understanding of mass wasting processes and geohazards and for economic prospects in sedimentary basins. In recent decades, refinements in the interpretation of these geobodies have benefited from increasingly good...

Presented at the SIAM-GS conference, September 2017

Risk assessment-led characterisation of a site for the geological storage of CO2 in the UK northern North Sea was performed for the EU SiteChar research project as one of a portfolio of sites. Implementation and testing of the SiteChar project site characterisation workflow has produced a ‘dry-run’ storage permit application that is compliant with...

The SiteChar research on the Southern Adriatic Sea site focused on the investigation of the geomechanical and hydrodynamic behaviour of the storage complex in the case of CO2 injection in a reservoir consisting of fractured carbonate formations. Special attention was paid to the effects that natural faults and fractures might have on CO2 migration,...

The Southern Adriatic Sea is one of the five prospective areas for CO2 storage being evaluated under the FP7 European Sitechar project. The potential reservoir identified in the investigated area is represented by a carbonate formation (Scaglia Formation-Late Cretaceous). This paper shows the site characterization applied to one of the structures i...

The FP7-funded SiteChar project examined the entire CO2 geological storage site characterisation process, from the initial feasibility studies through to the final stage of application for a CO2 storage permit based on criteria defined by the relevant European legislation. The SiteChar workflow for CO2 geological storage site characterisation provi...

Pore Network Model (PNM) is used to simulate mass transfer with mineral reaction in a single phase flow through porous medium which is here a sandstone sample from the reservoir formation of the Pakoslaw gas field. The void space of the porous medium is represented by an idealized geometry of pore-bodies joined by pore-throats. Parameters defining...

Carbon Capture and Storage (CCS) should be a key technology in order to achieve a decline in the CO2 emissions intensity of the power sector and other intensive industry, but this potential deployment could be restricted by cost issues as the International Energy Agency (IEA) in their last projections (World Energy Outlook 2013) has considered only...

In this paper, we present an overview of the SiteChar workflow model for site characterisation and assessment for CO2 storage. Site characterisation and assessment is required when permits are requested from the legal authorities in the process of starting a CO2 storage process at a given site. The goal is to assess whether a proposed CO2 storage s...

In this paper, we present an overview of the SiteChar workflow model for sitecharacterisation and assessment for CO2storage. Site characterisation and assessment is requiredwhen permits are requested from the legal authorities in the process of starting a CO2storageprocess at a given site. The goal is to assess whether a proposed CO2storage site ca...

The production of dry-run storage permit applications at two credible, if conceptual, CO2 storage sites allowed development of effective approaches to site characterization and identified the necessary levels of evidence required to assess the safety, containment and storage capacity of putative sites. This paper describes an exemplar permitting pr...

France Nord project is a Joint Industry Project that has grouped 4 public research institutes (BRGM, IFPEN, INERIS and Eifer) and 7 industrial partners (Total, GDF SUEZ, Storengy, EDF, Air Liquide, Lafarge and Vallourec) from 2008 to 2012. The first step of the France Nord project was to identify in the deep saline aquifers of the Paris Basin a geo...

Pre-characterisation of a CO2 storage site to be suitable for a storage permit application should be led and informed by risk assessment to anticipate, reduce and mitigate risks, and monitor unmitigated risks. A multi-store site is characterised in the UK northern North Sea from publicly available data as part of the EU-funded SiteChar research pro...

The Southern Adriatic Sea is one of the five perspective areas for CO2 storage being evaluated under the FP7 European SiteChar project. This site is the most challenging among those studied in this project, since the potential reservoir is hosted in a carbonate formation. In a first instance, the 3D geological static model at both regional and loca...

Korre A., Delprat-Jannaud F., Piessens K., Welkenhuysen K., Falus G., Vähäkuopus T., Nordbäck N., Poulsen N., Wickström L., Dudu A., Vincent C. J., Car M., Wójcicki A., Arts R., Hladik V., Molinero R., Martinez R., Komatina S., Akervoll I., Brüstle A. K., Götzl G., Brikmane B., Hatzignatiou D., State-ofthe- art of directives and regulatory regimes...

Carbon Capture and Storage (CCS) is one of the solutions that can significantly reduce CO2 during the transition from fossil fuel-based energy to an energy system based on renewable energy sources. Recent studies point out that sufficient storage capacity in saline aquifers and depleted gas fields is available to permanently store several decades w...

EU Member States are in the process of transposing European regulatory requirements that define the high-level conditions of a storage permit into their national laws. This regulatory framework defines a range of performance standards which recognise specific high-level uncertainties and long-term issues which storage developers will have to addres...

Carbon dioxide Capture and Storage (CCS) is a technology that could contribute significantly to reduced CO2 emissions to the atmosphere. By capturing carbon dioxide emitted from industrial processes, compressing it and injecting the CO2 into underground geological reservoirs of porous rock for permanent storage, it provides a bridging solution to m...

Transient electrokinetic coupling phenomena created at the microscopic scale by the passage of seismic waves through fluid-saturated porous media generate conversions between seismic and electromagnetic (EM) energy which can be observed at the macroscopic scale. Far from being a mere scientific curiosity, transient seismoelectric or electroseismic...

Well-seismic data such as vertical seismic profiles are supposed to provide detailed information about the elastic properties of the subsurface at the vicinity of the well. Heterogeneity of sedimentary terrains can lead to far from negligible multiple scattering, one of the manifestations of the nonlinearity involved in the mapping between elastic...

1D VSP nonlinear inversion provides accurate, and in particular high resolution estimation of an impedance profile. Unfortunately this technique is severely hampered by the 1D assumption. We propose here a 2D generalization of this technique. Although limited to gently laterally varying media, our approach is especially interesting in situations in...

We study the multiple scattering effects caused by fine-scale heterogeneity. For this purpose, it is unreasonable to rely on a linearization of the dependency of the wavefield in the parameters that describe the medium. Therefore, the only tools that correctly model wave propagation are based on the numerical solution of the (two-way) wave equation...

Waveform inversion aims at a quantitative estimation of the subsurface model. Such a quantitative estimation is a nonlinear problem: the relation between elastic parameters and waveform data is basically nonlinear. Perturbations in the velocity give rise to severe nonlinear perturbations in the wavefield. Other severe nonlinear effects appear when...

Geophysicists are quite aware of the important troubles that can be met when the seismic data are contaminated by multiple reflections. The situation they have in mind is the one where multiple reflections are generated by isolated interfaces associated with high impedance contrasts. We here study a more insidious effect of multiple scattering, nam...

The removal of multiple reflections remains a major challenge in seismic data processing. We develop a new method, inspired by the wavefield decomposition approach developed by Nemeth3 and based on a linearized waveform inversion to attenuate multiple reflections. Compared to Nemeth’s algorithm, we reduce significantly the inversion CPU time by a j...

All conventional seismic imaging techniques rely on the same scheme to model wave propagation within the subsurface. This "standard seismologist model" makes use of geometrical optics and neglects multiples scattering of waves, heterogeneities being assumed to be few and with weak amplitude. However these assumptions do not hold when we examine wel...

The removal of multiple reflections remains a ma- jor challenge in seismic data processing. Following Nemeth's Wavefield Decomposition Approach, we modify Ray+Born inversion so as to make it insensitive to the presence of multiple reflections. However, our method is not just an application of Nemeth's approach to multiple removal. It includes an up...

Quantitative migration or linearized inversion techniques rely on a linearization in the wave equation: the accuracy of the result depends on the accuracy of the linearization. The kinematics of events modeled using such a linearization depends on the reference velocity model. In this paper we show that, for acoustic wave propagation, the amplitude...

We present a new formulation of 3D traveltime reflection tomography designed to invert multi-valued arrivals. It is applied on a 3D data set recorded over a salt ridge from the North Sea.

Since the solution of reflection tomography is underdetermined, the use of a priori information is essential to compute a model that is satisfactory from a geological point of view. We propose to compute a model that, classically, matches in a least squares sense the observed travel times and that also satisfies some additional useful constraints o...

Applications of reflection tomography for the determination of complex geologic structures calls for the generalization of this method so that it can take triplications and other multiple arrivals into account. In this way, a new formulation of travel time inversion is proposed. It relies on the choice of an adequate parametric representation of tr...

The model calculated by traveltime inversion is underdetermined. One solution to this problem is to introduce a priori information so as to reduce the set of possible solutions to those satisfactory from a geological point of view. In this paper, the authors impose geological constraints on the relative position of the reflectors and in particular...

Many studies have shown the strong dependence of the solution of reflection tomography (or travel time inversion) in the model discretization interval: such solutions are purely numerical artifacts. The cause lies in the formulation of the reflection tomography which turns out to be an ill-posed problem unless properly regularized. Adequate regular...

Inversion of reflection travel times (or reflection tomography or tomographic inversion) allows determination of the structure of the subsurface from arrival times of reflected waves. Because the solution of a tomographic inversion is often underdetermined, it is essential to carry out an uncertainty analysis on the solution, which is classically d...