Electrical Resistivity Tomography (ERT) for Monitoring of CO2 Migration - from Tool Development to Reservoir Surveillance at the Ketzin Pilot Site

Schmidt‐Hattenberger, Cornelia; Bergmann, Peter G.; Bösing, D.; Labitzke, T.; Möller, M.; Schröder, Stephan; Wagner, F.; Schütt, Hartmut

doi:10.1016/j.egypro.2013.06.329

Cited by 33 publications

(9 citation statements)

References 13 publications

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“…The measurements of electrical resistivity tomography at the Ketzin site are based on a vertical electrical resistivity array (VERA) (Schmidt‐Hattenberger et al . , , , ), which consists of 45 downhole electrodes that are deployed in the three wells Ktzi200, Ktzi201, and Ktzi202 (Fig. a).…”

Section: Electrical Resistivity Tomography At the Ketzin Sitementioning

confidence: 99%

Fluid injection monitoring using electrical resistivity tomography — five years of injection at Ketzin, Germany

Bergmann

Schmidt‐Hattenberger

Labitzke

et al. 2016

Geophysical Prospecting

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Between the years 2008 and 2013, approximately 67 kilotons of CO2 have been injected at the Ketzin site, Germany. As part of the geophysical monitoring programme, time‐lapse electrical resistivity tomography has been applied using crosshole and surface‐downhole measurements of electrical resistivity tomography. The data collection of electrical resistivity tomography is partly based on electrodes that are permanently installed in three wells at the site (one injection well and two observation wells). Both types of ERT measurements consistently show the build‐up of a CO2‐related resistivity signature near the injection point. Based on the imaged resistivity changes and a petrophysical model, CO2 saturation levels are estimated. These CO2 saturations are interpreted in conjunction with CO2 saturations inferred from neutron‐gamma loggings. Apart from the CO2–brine substitution response in the observed resistivity changes, significant imprints from the dynamic behaviour of the CO2 in the reservoir are observed.

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Section: Electrical Resistivity Tomography At the Ketzin Sitementioning

confidence: 99%

Fluid injection monitoring using electrical resistivity tomography — five years of injection at Ketzin, Germany

Bergmann

Schmidt‐Hattenberger

Labitzke

et al. 2016

Geophysical Prospecting

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“…Over the last decades, methods to study the electric resistivity of the subsurface -such as magnetotellurics (e.g., Muñoz et al, 2018or Blecha et al, 2018 and electrical resistivity tomography (ERT; e.g., Storz et al, 2000;Schütze and Flechsig, 2002;Schmidt-Hattenberger et al, 2013) -have proven to be especially useful when fluids are involved, as T. Nickschick et al: Large-scale ERT in the Cheb Basin they are used as efficient techniques for noninvasive imaging of subsurface structures. A multitude of experiments that focus on carbon dioxide in particular have been carried out, mainly at carbon capture and storage sites, which are typically well explored and where the fluid injection system is controllable (Carrigan et al, 2013;Nakatsuka et al, 2010;Schmidt-Hattenberger et al, 2013;Bergmann et al, 2017). However, when it comes to natural CO 2 emanation sites, such as volcanically or magmatically active areas, this is often not the case: the fluid system can often be very complex and variable in space and time, hence requiring special approaches (Finizola et al, 2009;Pettinelli et al, 2010;Revil et al, 2008Revil et al, , 2011Gresse et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Large-scale electrical resistivity tomography in the Cheb Basin (Eger Rift) at an International Continental Drilling Program (ICDP) monitoring site to image fluid-related structures

Nickschick¹,

Flechsig²,

Mrlina³

et al. 2019

Solid Earth

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Abstract. The Cheb Basin, a region of ongoing swarm earthquake activity in the western Czech Republic, is characterized by intense carbon dioxide degassing along two known fault zones – the N–S-striking Počatky–Plesná fault zone (PPZ) and the NW–SE-striking Mariánské Lázně fault zone (MLF). The fluid pathways for the ascending CO2 of mantle origin are one of the subjects of the International Continental Scientific Drilling Program (ICDP) project “Drilling the Eger Rift” in which several geophysical surveys are currently being carried out in this area to image the topmost hundreds of meters to assess the structural situation, as existing boreholes are not sufficiently deep to characterize it. As electrical resistivity is a sensitive parameter to the presence of conductive rock fractions as liquid fluids, clay minerals, and also metallic components, a large-scale dipole–dipole experiment using a special type of electric resistivity tomography (ERT) was carried out in June 2017 in order to image fluid-relevant structures. We used permanently placed data loggers for voltage measurements in conjunction with moving high-power current sources to generate sufficiently strong signals that could be detected all along the 6.5 km long profile with 100 and 150 m dipole spacings. After extensive processing of time series for voltage and current using a selective stacking approach, the pseudo-section is inverted, which results in a resistivity model that allows for reliable interpretations depths of up than 1000 m. The subsurface resistivity image reveals the deposition and transition of the overlying Neogene Vildštejn and Cypris formations, but it also shows a very conductive basement of phyllites and granites that can be attributed to high salinity or rock alteration by these fluids in the tectonically stressed basement. Distinct, narrow pathways for CO2 ascent are not observed with this kind of setup, which hints at wide degassing structures over several kilometers within the crust instead. We also observed gravity and GPS data along this profile in order to constrain ERT results. A gravity anomaly of ca. −9 mGal marks the deepest part of the Cheb Basin where the ERT profile indicates a large accumulation of conductive rocks, indicating a very deep weathering or alteration of the phyllitic basement due to the ascent of magmatic fluids such as CO2. We propose a conceptual model in which certain lithologic layers act as caps for the ascending fluids based on stratigraphic records and our results from this experiment, providing a basis for future drillings in the area aimed at studying and monitoring fluids.

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“…The design of the existing Harvey 2 injection well did not permit the installation of a second electrode array, so conventional cross well measurements (Carrigan et al, 2013, Bergmann et al, 2012, Christensen et al, 2006, Schmidt-Hattenberger et al, 2013., Schmidt-Hattenberger et al, 2013, Yang et al, 2014 were not possible. For the In-Situ laboratory experiment, time-lapse detection of changes in electrical properties around the instrumented monitoring well was the objective.…”

Section: Introductionmentioning

confidence: 99%

Time lapse in-hole electrical resistivity surveying during a shallow release of CO2 gas: Harvey, Western Australia

Harris

Costall

Nguyen

et al. 2019

ASEG Extended Abstracts

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Electrical Resistivity Tomography (ERT) for Monitoring of CO2 Migration - from Tool Development to Reservoir Surveillance at the Ketzin Pilot Site

Cited by 33 publications

References 13 publications

Fluid injection monitoring using electrical resistivity tomography — five years of injection at Ketzin, Germany

Fluid injection monitoring using electrical resistivity tomography — five years of injection at Ketzin, Germany

Large-scale electrical resistivity tomography in the Cheb Basin (Eger Rift) at an International Continental Drilling Program (ICDP) monitoring site to image fluid-related structures

Time lapse in-hole electrical resistivity surveying during a shallow release of CO2 gas: Harvey, Western Australia

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