A novel warped-space concept for interactive 3D-geometry-inversion to improve seismic imaging

Alvers, Michael R.; Götze, H.-J.; Barrio-Alvers, Liliana; Schmidt, Sabine; Lahmeyer, B.; Plonka, Christian

doi:10.3997/1365-2397.32.4.74375

Cited by 20 publications

(6 citation statements)

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“…The workflow described therein allows the exact calculation of the gravimetric and magnetic potential, the three field components, and the six gradients in each case. This was initially programmed as IGAS (Interactive Gravimetric Application System) in the languages ALGOL and FORTRAN, and in the following decades was continuously developed further (using Java) into the actual already mentioned software package IGMAS+, which is cross-platform and is available for operating systems Windows, Linux, and MacOS (Schmidt et al, 2010;Alvers et al, 2014Alvers et al, , 2015aSchmidt et al, 2011Schmidt et al, , 2020Anikiev et al, 2020Anikiev et al, , 2021Götze et al, 2021). Because of the triangulated model structure, the software can handle complex structures (multi Z surfaces) like the overhangs of salt domes very well.…”

Section: The Public Forward Modeling Tool Igmas+mentioning

confidence: 99%

“…What can we conclude so far? Alvers (1998), Alvers et al (2013) and Alvers et al (2014) showed on the basis of extensive test calculations and modeling examples that the evolution strategy with covariance matrix adaptation is an optimization method which, under various constraints (penalty term and geometry limits), can optimize a considerable number of free parameters in a reasonable number of function calls and thus in a reasonable computation time. The algorithms are largely independent of strategy-internal parameters and behave numerically stable to small variations in initial models and the use of sequences of other random numbers.…”

Section: Evolution Strategy As a Tool For Lattice Optimizationmentioning

confidence: 99%

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Inversion of potential fields by interactive optimization of 3D subsurface models using a spring-based space warping and evolution strategy

Alvers¹,

Götze

Anikiev

et al. 2023

GEOPHYSICS

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Rapid development of dynamic data-integrative modeling of geological processes and subsurface structures is an important factor for sustainable utilization of natural resources. One of the current gaps is the interactive construction of realistic threedimensional models of the Earth´s underground. We present here a methodology of 3-D interactive processing of potential fields - gravity and magnetics - as well as their potentials and derivatives, combining forward and inverse modeling. Forward computations are based on the approximation of geological subsurface structures by polyhedra with triangulated surfaces. Inverse computations for the model geometry are performed by means of Covariance-Matrix-Adaptation Evolution Strategy (CMAES), which is proved to be efficient in case of a strongly non-linear problem and highdimensional parameter space, as in potential field models. The main disadvantage is related to triangulation, as certain algorithmic constraints must be applied during approximation of geological body shapes. To avoid topology distortions we use a concept of warping the space containing the model, rather than the model itself. However, the optimized lengths of grid sides are dependent on each other, which degrades the self-adaptation of the CMA-ES. The elegant solution is to introduce a system of virtual elastic springs connecting the grid nodes. We present a numerical formulation of this system and provide a proof of concept rather than an overview of theoretical concepts of inversion schemes. The new workflow is tested on the 3-D SEAM model and applied to a real case study of salt dome modeling in the Northwest German Basin. In the context of the inversion procedure described here we demonstrate how an interpreter can visually control and influence the quality of the inversion on a timeline.

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Section: The Public Forward Modeling Tool Igmas+mentioning

confidence: 99%

Section: Evolution Strategy As a Tool For Lattice Optimizationmentioning

confidence: 99%

Inversion of potential fields by interactive optimization of 3D subsurface models using a spring-based space warping and evolution strategy

Alvers¹,

Götze

Anikiev

et al. 2023

GEOPHYSICS

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“…Subsequently, the mapped seismic horizons were converted from two-way travel time (TWT) to depth using standard VSP (vertical seismic profile) logs. The resulted depth maps were used to constrain the initial input geometries for the 3D gravity and magnetic modelling performed by the IGMAS+ software (Alvers et al 2014;Schmidt et al 2015).…”

Section: D Seismic Reflection Datamentioning

confidence: 99%

“…The software platform IGMAS+ offers an interdisciplinary modelling approach integrating independent data sets from seismic, boreholes, and geology, and thus reducing the ambiguity of potential field inversion. The superposition of a voxel model and triangulated surfaces gives possibility to produce complex ("hybrid") models allowing to describe geological structures in a more realistic way (Schmidt et al 2011;Alvers et al 2014).…”

Section: D Modelling With Igmas+mentioning

confidence: 99%

“…Seismic and well data interpretation coupled with an integrated potential field modelling can provide valuable information from larger depths too, where other geophysical methods are hardly applicable (e.g., Götze et al 2007;Reynisson et al 2009;Alvers et al 2014;Tschirhart and Pehrsson 2016). Magmatic intrusions beneath volcanic structures have been studied worldwide using combination of several geophysical methods to get valuable constraints on their subsurface structural configuration.…”

Section: Introductionmentioning

confidence: 99%

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Intraplate volcanism in the Danube Basin of NW Hungary: 3D geophysical modelling of the Late Miocene Pásztori volcano

Pánisová

Balázs

Zalai

et al. 2017

Int J Earth Sci (Geol Rundsch)

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Three-dimensional geophysical modelling of the early Late Miocene Pásztori volcano (ca. 11-10 Ma) and adjacent area in the Little Hungarian Plain Volcanic Field of the Danube Basin was carried out to get an insight into the most prominent intracrustal structures here. We have used gridded gravity and magnetic data, interpreted seismic reflection sections and borehole data combined with re-evaluated geological constraints. Based on petrological analysis of core samples from available six exploration boreholes, the volcanic rocks consist of a series of alkaline trachytic and trachyandesitic volcanoclastic and effusive rocks. The measured magnetic susceptibilities of these samples are generally very low suggesting a deeper magnetic source. The age of the modelled Pásztori volcano, buried beneath a 2 km-thick Late Miocene-to-Quaternary sedimentary sequence, is 10.4 +/− 0.3 Ma belonging to the dominantly normal C5 chron. Our model includes crustal domains with different effective induced magnetizations and densities: uppermost 0.3-1.8 km thick layer of volcanoclastics underlain by a trachytic-trachyandesitic coherent and volcanoclastic rock units of a maximum 2 km thickness, with a top situated at minimal depth of 2.3 km, and a deeper magmatic pluton in a depth range of 5-15 km. The 3D model of the Danube Basin is consistent with observed high ΔZ magnetic anomalies above the volcano, while the observed Bouguer gravity anomalies correlate better with the crystalline basement depth. Our analysis contributes to deeper understanding of the crustal architecture and the evolution of the basin accompanied by alkaline intraplate volcanism.

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Uncertainties in Geomodelling Related to Geophysical Inversion

Götze¹,

Wellmann²

2020

Encyclopedia of Solid Earth Geophysics

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In order to be able to make reliable predictions about the quality and validity of geomodelling, the knowledge and quantification of uncertainties in input and output parameters is of increasing importance. For this purpose, the influence of the uncertainties and their extent on the result of the modelling is investigated by statistical methods. The evaluation of these uncertainties is specifically important when geomodelling is combined with geophysical inversion.

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A novel warped-space concept for interactive 3D-geometry-inversion to improve seismic imaging

Cited by 20 publications

References 0 publications

Inversion of potential fields by interactive optimization of 3D subsurface models using a spring-based space warping and evolution strategy

Inversion of potential fields by interactive optimization of 3D subsurface models using a spring-based space warping and evolution strategy

Intraplate volcanism in the Danube Basin of NW Hungary: 3D geophysical modelling of the Late Miocene Pásztori volcano

Uncertainties in Geomodelling Related to Geophysical Inversion

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