Wolfgang Weinzierl

Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences

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Heidrun Kopp

GEOMAR Helmholtz Centre for Ocean Research Kiel

Mireille Laigle

Observatoire de la Côte d’Azur

Ernst R. Flueh

GEOMAR Helmholtz Centre for Ocean Research Kiel

Philippe Charvis

Géoazur

Mikaël Evain

Ifremer

A. Galvé

Université Côte d'Azur

Dirk Klaeschen

GEOMAR Helmholtz Centre for Ocean Research Kiel

Bernd Wiese

Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences

Alfred Hirn

Institut de physique du globe de Paris

Anne Bécel

Lamont-Doherty Earth Observatory

Cooperative Institutions

Centre National de la Recherche Scientifique

Institut de physique du globe de Paris

Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences

Université Paris Cité

Géoazur

University of Potsdam

Centre de Géosciences

Université Côte d'Azur

Observatoire de la Côte d’Azur

GEOMAR Helmholtz Centre for Ocean Research Kiel

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Pre-Injection Site Investigations in a Poro-Elastic Description of the Svelvik Ridge

SSRN Electronic Journal (2021)

Wolfgang Weinzierl Eduardo Barros Alv-Arne Grimstad Bernd Wiese O. Leeuwenburgh

We present the results of a rock physics driven workflow to analyze and steer a planned CO2 migration campaign, it combines a rock-physical seismic model, reservoir model and Bayesian scenario framework to assess monitoring configurations. The injection of CO2 into the subsurface requires a detailed understanding of the petrophysical properties and rock physical frame of the formation under stress. The underlying assumptions made for the unconsolidated high porosity formation have a significant impact on the expected seismic response. For a shallow aquifer pressure and saturation dependent elastic parameters are derived within a rock physical description. Distinguishing pressure and saturation related changes of the acoustic impedance is subject to the sensitivities of the properties used to derive the underlying seismic P- and S-velocities as well as densities. These uncertainties can induce a non-negligible variability in the footprint of a seismic image of the CO2 plume. The rock physics model is based on a solid frame consisting of quartz and clay and saturated with water and gas. The integrated workflow coupled with dynamic simulations provides a possibility to define and evaluate conformance measures during operation. Within this context the workflow is applied to the extended Svelvik CO2 field laboratory, which can be considered as a big sandbox model with capabilities for up-scaling to larger storage formations. An experimental design assessing the sensitivity of the information present for the site is translated into a scenario-based ensemble of dynamic models. Following, a practical quantitative workflow for a-priori assessment of monitoring strategies in probabilistic conformance verification is demonstrated. The results provide insight into the impact of different aspects of geophysical monitoring configurations (e.g., sparsity, noise levels, detection thresholds and timing) on the conformance verification accuracy.

10.2139/ssrn.3813040

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Volumetric Impact of Fault Perturbation within the First Fresnel Zone

Wolfgang Weinzierl Lothar Schulte Victor Aarre

Summary Resolution within seismic imaging has to be understood in all three dimensions to make quantitative approximations of subsurface geometries. Constructive interference of incident spherical waves within the first Fresnel zone will limit the resolvable dips due to spatial aliasing. Motivated by the problem of estimating the effect on the volumetric ranges, which we can anticipate when allowing trapping features to be equally probable within the first Fresnel zone, we can construct multiple realizations of a geological setting. After an initial vertical slicing along the faults, to obtain the mean frequency and velocity within a horizontal window in the vicinity of the structural heterogeneities, we stochastically perturb the fault interpretations. The frequency and velocity dependent perturbation of the dips are analytically derived based on geometric considerations. The anticipated maxima of the repositioned fault dips allow to specify thresholds for deterministic definitions of high and low cases for the faults geometries in a framework. The structural models, resulting by repositioning the faults, show significant alterations of the hanging and footwall horizon terminations due to the varying dips. The outlined method is applied to the structural and stratigraphic interpretation obtained for a prospect in the Gulf of Mexico. The spatial variations of the bounding features, of the entrapped object, results in a spread of volumetric outcomes when analyzing the gross rock volume of a compartment.

Fresnel zone

10.1190/segam2015-5836516.1

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A Methodology to Seperate and Analyze a Seismic Wide Angle Profile

The EGU General Assembly (2010)

Wolfgang Weinzierl Heidrun Kopp

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Demonstration of a successful soft chemical stimulation in a geothermal sandstone reservoir in Mezőberény (Hungary)

Geothermics (2024)

Maren Brehme Ábel Markó Máté Osvald Günter Zimmermann Wolfgang Weinzierl

10.1016/j.geothermics.2024.102980

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Composition and deep structure of island arc crust in the central Lesser Antilles: Insights for the formation of continental crust

The EGU General Assembly (2011)

Heidrun Kopp Wolfgang Weinzierl Mireille Laigle Ernst R. Flueh A. Hirn

Continental Margin

Island arc

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A 3D seismic tomography of the Lesser Antilles Subduction Zone offshore Dominica and Martinique islands

The EGU General Assembly (2010)

Mikaël Evain A. Galvé Philippe Charvis Mireille Laigle Ernst R. Flueh

Martinique

Seismic Tomography

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Formation of continental crust: Insights from island arc crustal structure

Heidrun Kopp Wolfgang Weinzierl Mireille Laigle Ernst R. Flueh A. Hirn

Continental Margin

Island arc

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Generalized Spectral Decomposition and its Use in Spectral Balancing

Proceedings (2017)

Wolfgang Weinzierl V. Aarre S. Courtade

Summary A new spectral balancing method based on a continuous wavelet transform is introduced. A hybrid spectral decomposition method, customizable to behave either as a short time Fourier or continuous wavelet transform, is used to decompose the input into its constituent frequencies. Anelastic attenuation processes are accounted for by construction of mother wavelets, being scaled and dilated. This new method is true-amplitude, lifting weaker amplitude frequencies to the same level as the amplitude of the strongest frequency band. The improvements within an interpretation context are evident when comparing the input and spectrally enhanced output. We test the new spectral balancing method on a 3D onshore survey acquired across the Teapot Dome structure, Wyoming. Previously unresolved features in the original amplitude are resolved on the spectrally balanced output. Spectral balancing provides additional information which often is obscured or masked by the limited bandwidth in conventional post-stack data.

10.3997/2214-4609.201700532

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Designing Cross-Well Seismic for Fiber Optics: A Case Study for the Svelvik CO2 Test Site

A. Wuestefeld Wolfgang Weinzierl A. Romdhane

Summary Cross-Well seismic allows for high accuracy and resolution characterisation of subsurface velocity changes. It is particularly useful if the location of the expected change is known. The revitalization of the Svelvik CO2 field test site provides a unique opportunity to scale and develop monitoring strategies aimed at increasing the value of information obtained from individual monitoring streams. In this context cross-well seismic will provide a characterisation of subsurface velocity changes with high accuracy. In addition to geophones, the wells will be equipped with fibre-optic cables for DAS measurements to verify conformance and containment. In this work, we perform a synthetic study to assess the sensitivity of a seismic cross-well acquisition layout using DAS measurements caused by velocity changes due to CO2 injection at the planned field test site. In a first stage, the effect of well spacing is studied. We also derive and compare various parameters using DAS signals and evaluate their applicability to decide on the presence of containment breaches. We identify critical shot-receiver positions to monitor containment and assess conformance. We analyse the effect of wrapping angles of helical fibres in comparison to a conventional straight fibre.

Geophone

Containment (computer programming)

10.3997/2214-4609.2019x604013

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Preinjection AVO conceptual modeling for the Svelvik CO2 field laboratory

Wolfgang Weinzierl Bernd Wiese Stefan Lüth Dennis Rippe Conny Schmidt-Hattenberger

The offset dependent variation of the acoustic impedance has been used throughout the lifecycle of oilfields to discriminate pressure and saturation differences. While there are many ambiguities caused by overburden, tuning, morpho- and lithological effects the analysis provides additional insights to the distribution of pore pressure and fluids in a given rock physics framework. An experimental design assessing the sensitivity of AVO effects in a rock physical context is proposed. The methodology is applied to a planned CO2 injection test at the Svelvik CO2 Field Laboratory, South of Oslo, Norway. The geology is inspired from a recent site characterization (Bakk et al., 2012) and is supplemented with different conceptual features. The information present for the site is translated into a scenario based ensemble of static models. A detailed understanding of the underlying rock physics model is required not only to design the monitoring campaigns before injection, but will provide the basis to alter the underlying parameters defining the magnitude and sensitivity of simulated and measured acoustic impedances. Distinguishing pressure and saturation related changes of the acoustic impedance is subject to the sensitivities of the properties used to derive the underlying seismic P- and S-velocities as well as densities. These uncertainties can induce a non-negligible variability in the footprint of a seismic image of the CO2 plume. This allows to explain subtle heterogeneities of highly simplified simulations. Designing cost efficient surveys to obtain an effective coverage of the injected CO2 and discrimination of fluid and saturation related pore effects require a rigorous approach in the quantification of the rock physical properties upfront. Presentation Date: Wednesday, October 17, 2018 Start Time: 9:20:00 AM Location: Poster Station 3 Presentation Type: Poster

Overburden

10.1190/segam2018-2989649.1

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