Background resistivity model from seismic velocities

Werthmüller, Dieter; Ziolkowski, Anton; Wright, David

doi:10.1190/geo2012-0445.1

Cited by 41 publications

(14 citation statements)

References 29 publications

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“…Faust, 1953;Brito dos Santos et al, 1988;Hacikoylu et al, 2006;Werthmüller et al, 2013). In Hontomín, the log data of the GW1 and the H4 wells were used to derive resistivity-velocity relationships for the subsurface and compute a 3-D velocity model of the site, using the 3-D resistivity model as a reference.…”

Section: Resistivity-velocity Relationshipsmentioning

confidence: 99%

Joint interpretation of magnetotelluric, seismic, and well-log data in Hontomín (Spain)

et al. 2016

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Abstract. Hontomín (N of Spain) hosts the first Spanish CO 2 storage pilot plant. The subsurface characterization of the site included the acquisition of a 3-D seismic reflection and a circumscribed 3-D magnetotelluric (MT) survey. This paper addresses the combination of the seismic and MT results, together with the available well-log data, in order to achieve a better characterization of the Hontomín subsurface. We compare the structural model obtained from the interpretation of the seismic data with the geoelectrical model resulting from the MT data. The models correlate well in the surroundings of the CO 2 injection area with the major structural differences observed related to the presence of faults. The combination of the two methods allowed a more detailed characterization of the faults, defining their geometry, and fluid flow characteristics, which are key for the risk assessment of the storage site. Moreover, we use the well-log data of the existing wells to derive resistivity-velocity relationships for the subsurface and compute a 3-D velocity model of the site using the 3-D resistivity model as a reference. The derived velocity model is compared to both the predicted and logged velocity in the injection and monitoring wells, for an overall assessment of the computed resistivityvelocity relationships. The major differences observed are explained by the different resolution of the compared geophysical methods. Finally, the derived velocity model for the near surface is compared with the velocity model used for the static corrections in the seismic data. The results allowed extracting information about the characteristics of the shallow unconsolidated sediments, suggesting possible clay and water content variations. The good correlation of the velocity models derived from the resistivity-velocity relationships and the well-log data demonstrate the potential of the combination of the two methods for characterizing the subsurface, in terms of its physical properties (velocity, resistivity) and structural/reservoir characteristics. This work explores the compatibility of the seismic and magnetotelluric methods across scales highlighting the importance of joint interpretation in near surface and reservoir characterization.

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Section: Resistivity-velocity Relationshipsmentioning

confidence: 99%

Joint interpretation of magnetotelluric, seismic, and well-log data in Hontomín (Spain)

et al. 2016

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“…Resistivity-velocity relationships have been used to calculate one physical parameter as a function of the other in numerous works (e.g. Faust, 1953;Brito dos Santos et al, 1988;Hacikoylu et al, 2006;Werthmüller et al, 2013). In Hontomín, the log data of the GW1 and the H4 wells were used to derive resistivity-velocity relationships for the subsurface and compute a 3-D velocity model of the site, using the 3-D resistivity model as a reference.…”

Section: Resistivity-velocity Relationshipsmentioning

confidence: 99%

“…Successful CO 2 storage sites include a complete characterization, dedicated to understanding the characteristics of the subsurface as well as ensuring the suitability, safety, and security of the site (e.g. Chadwick et al, 2004;Förster et al, 2006;White, 2013). The selection of Hontomín as a pilot CO 2 storage site motivated a multidisciplinary characterization of the area, aimed to unravel the main characteristics of the subsurface structures.…”

Section: Introductionmentioning

confidence: 99%

Joint interpretation of magnetotelluric, seismic and well-log data in Hontomín (Spain)

Ogaya¹,

Alcalde²,

Marzán³

et al. 2016

Preprint

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Abstract. Hontomín (N of Spain) hosts the first Spanish CO2 storage pilot plant. The subsurface characterisation of the site included the acquisition of a 3D seismic reflection and a circumscribed 3D magnetotelluric (MT) survey. This paper addresses the combination of the seismic and MT results, together with the available well-log data, in order to achieve a better characterisation of the Hontomín subsurface. We compare the structural model obtained from the interpretation of the seismic data with the geoelectrical model resulting from the MT data. The models corr elate well in the surroundings of the CO2 injection area with the major structural observed related to the presence of faults. The combination of the two methods allowed a more detailed characterisation of the faults, defining their structural and fluid flow characteristics, which is key for the risk assessment of the storage site. Moreover, we use the well-log data of the existing wells to derive resistivity-velocity relationships for the subsurface formations and compute a 3D velocity model of the site using the 3D resistivity model as a reference. The derived velocity model is compared to both the predicted and logged velocity in the injection and monitoring wells, for an overall assessment of the resistivity-velocity relationships computed. Finally, the derived velocity model is compared in the near surface with the velocity model used for the static corrections in the seismic data. The results allowed extracting information about the characteristics of the shallow subsurface, enhancing the presence of clays and water content variations. The good correlation of t he velocity models and well-log data demonstrate the potential of the two methods for characterising the subsurface, in terms of its physical properties (velocity, resistivity) and structural/reservoir characteristics. This work explores the compatibility of the seismic and magnetotelluric methods across scales highlighting the importance of joint interpretation in reservoir characterisation.

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“…Primary applications of such cross-property relationship include filling in data gaps when one property is more readily available than the other. Advanced uses of such relationship include the input of a priori information to reduce ambiguity in the inversion process (Mukerji et al 2009;Werthmu¨ller et al 2013). (1953) has shown that both resistivity and velocity behave similarly with increasing depth.…”

Section: Background Resistivitymentioning

confidence: 99%

“…A second widely used alternative is the construction of the resistivity cube based on a velocity-porosity-resistivity petrophysical models available in the literature (Hashin & Shtrikman 1962;Hermance 1979;Werthmu¨ller et al 2013).…”

Section: Model Building Workflowmentioning

confidence: 99%

Marlim R3D: a realistic model for CSEM simulations - phase I: model building

Carvalho

Menezes

2017

Braz. J. Geol.

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ABSTRACT:The marine controlled-source electromagnetic (CSEM) method provides complementary information to seismic imaging in the exploration of sedimentary basins. The CSEM is mainly used for reservoir scanning and appraisal. The CSEM interpretation workflow is heavily based on inversion and forward -modeling for hypothesis testing. Until the recent past, the effectiveness of a given workflow was achieved after the drilling results, as there wasn't any geological complex model available to serve as a benchmark. In the present paper, we describe the workflow to build up Marlim R3D, a realistic and complex geoelectric model. Marlim R3D aims to be a reference model of turbidite reservoirs of the Brazilian continental margin. Our model is based on seismic interpretation and constrained by the input of available well-log information. The workflow used is composed of seven steps: seismic and well-log dataset loading, well-tie, Vp cube construction, Vp resistivity calibration, time-depth conversion, resistivity cube construction, and quality-control check. As a result, we obtained an interpreted dataset composed by main stratigraphic horizons, pseudo-well logs, and the resistivity cubes. These elements were made freely available for research or commercial use, under the Creative Common License, at the Zenodo platform. KEYWORDS

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Background resistivity model from seismic velocities

Cited by 41 publications

References 29 publications

Joint interpretation of magnetotelluric, seismic, and well-log data in Hontomín (Spain)

Joint interpretation of magnetotelluric, seismic, and well-log data in Hontomín (Spain)

Joint interpretation of magnetotelluric, seismic and well-log data in Hontomín (Spain)

Marlim R3D: a realistic model for CSEM simulations - phase I: model building

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