Comparative study of geophysical and soil–gas investigations at the Hartoušov (Czech Republic) natural CO2 degassing site

Sandig, Claudia; Sauer, U.; Bräuer, Karin; Serfling, Ulrich; Schütze, Claudia

doi:10.1007/s12665-014-3242-5

Cited by 14 publications

(8 citation statements)

References 56 publications

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“…In addition, other deep biosphere habitats may exist that are associated with CO 2 reservoirs in geological trapping structures, as indicated by an increase in gas flow rates after swarm earthquakes pointing to a gas release after seismically induced fracking of sealing layers (Sandig et al, 2014 ; Sauer et al, 2014 ; Schuessler et al, 2016 ; Fischer et al, 2017 ). Additionally, Kämpf and Bankwitz ( 2005 ) described dm- to m-sized cavities in sediments of the nearby Nová Ves II open-cast mine at 50 mbs (meter below surface), which developed along fluid migration pathways.…”

Section: Introductionmentioning

confidence: 99%

Microbial Signatures in Deep CO2-Saturated Miocene Sediments of the Active Hartoušov Mofette System (NW Czech Republic)

et al. 2020

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The Hartoušov mofette system is a natural CO2 degassing site in the central Cheb Basin (Eger Rift, Central Europe). In early 2016 a 108 m deep core was obtained from this system to investigate the impact of ascending mantle-derived CO2 on indigenous deep microbial communities and their surrounding life habitat. During drilling, a CO2 blow out occurred at a depth of 78.5 meter below surface (mbs) suggesting a CO2 reservoir associated with a deep low-permeable CO2-saturated saline aquifer at the transition from Early Miocene terrestrial to lacustrine sediments. Past microbial communities were investigated by hopanoids and glycerol dialkyl glycerol tetraethers (GDGTs) reflecting the environmental conditions during the time of deposition rather than showing a signal of the current deep biosphere. The composition and distribution of the deep microbial community potentially stimulated by the upward migration of CO2 starting during Mid Pleistocene time was investigated by intact polar lipids (IPLs), quantitative polymerase chain reaction (qPCR), and deoxyribonucleic acid (DNA) analysis. The deep biosphere is characterized by microorganisms that are linked to the distribution and migration of the ascending CO2-saturated groundwater and the availability of organic matter instead of being linked to single lithological units of the investigated rock profile. Our findings revealed high relative abundances of common soil and water bacteria, in particular the facultative, anaerobic and potential iron-oxidizing Acidovorax and other members of the family Comamonadaceae across the whole recovered core. The results also highlighted the frequent detection of the putative sulfate-oxidizing and CO2-fixating genus Sulfuricurvum at certain depths. A set of new IPLs are suggested to be indicative for microorganisms associated to CO2 accumulation in the mofette system.

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Section: Introductionmentioning

confidence: 99%

Microbial Signatures in Deep CO2-Saturated Miocene Sediments of the Active Hartoušov Mofette System (NW Czech Republic)

et al. 2020

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“…Nickschick et al (2015) calculated that between 23 and 97 tons of CO 2 are emitted diffusively and advectively each day in an area of about 0.33 km 2 in the HMF. They related the heavy degassing to the presence of a deep-seated, reactivated N-S-running fault [Počatky-Plesná fault zone (PPZ), Bankwitz et al (2003); Nickschick et al (2015)], which was indicated by analyzing a digital terrain model, geoelectric and gravity measurements ), as well as by self-potential (SP) (Sandig et al 2014) and ground penetrating radar (GPR) (Hubatka et al 2004).…”

Section: Site Descriptionmentioning

confidence: 99%

“…While many studies have focused on CO 2 capture and storage sites, far fewer studies exist that used geoelectrical methods at natural, terrestrial degassing sites. Most of these CO 2 degassing studies either used geoelectrical methods (Flechsig et al 2008;Nickschick et al 2015;Pettinelli et al 2010;Schütze et al 2012a, b) or combined them with self-potential methods (Revil et al 2008(Revil et al , 2011Byrdina et al 2009;Finizola et al 2010;Sandig et al 2014;Sauer et al 2013). Although all of these studies can reveal the underground structure of degassing sites (Ramirez et al 2003;Bergmann et al 2012Bergmann et al , 2016, the aspect of changes over time within these degassing sites has only been scarcely researched (Drahor et al 2012;Fedele et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Architecture and temporal variations of a terrestrial CO2 degassing site using electric resistivity tomography and self-potential

Nickschick

Flechsig

Meinel

et al. 2017

Int J Earth Sci (Geol Rundsch)

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“…This requires the sealing of the porous and permeable horizons by a tight caprock and the long-term integrity of both open and abandoned wells, which have reached the horizons (Wiese et al 2013;Ngoc et al 2014;Sandig et al 2014). In the North German Basin there are a number of horizons serving as tight barrier rocks, including shale and salt horizons with permeability values in the range of 10 -21 -10 -19 m 2 (Brasser et al 2008;Reinicke et al 2011;Kissinger et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Risk assessment of abandoned wells affected by CO2

et al. 2015

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Flawless operation during injection and a longterm seal of the storage reservoir after injection are the prerequisites for successful CO 2 storage in the geological subsurface. This requires the sealing of the porous permeable horizons by a tight caprock and long-term integrity of open and abandoned wells which have penetrated these horizons. As a basic requirement for the inception of a CO 2 injection scheme in any sequestration project, the integrity of the existing wells in the field must be proven. This paper reviews the relevant items including the geology, relevant wells and their standards, well integrity, and integrity evaluation methods. At the end, a novel concept is introduced to evaluate well integrity for abandoned wells. It is concluded that the verification of technical well integrity is significantly more difficult for abandoned wells, because measurements and tests to close information gaps are no longer possible. If information is lacking for a direct assessment, the quantification of the risk of leakage is only possible indirectly. For an indirect assessment, a realistic risk assessment should consider the composite system casing-cement-rock as a whole and also include self-healing caused by CO 2 interaction with the composite system and/or the indigenous rock. The proposed new method covers both qualitative and quantitative analysis, and it is more comprehensive, sophisticated and easier to implement.

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Comparative study of geophysical and soil–gas investigations at the Hartoušov (Czech Republic) natural CO2 degassing site

Cited by 14 publications

References 56 publications

Microbial Signatures in Deep CO2-Saturated Miocene Sediments of the Active Hartoušov Mofette System (NW Czech Republic)

Microbial Signatures in Deep CO2-Saturated Miocene Sediments of the Active Hartoušov Mofette System (NW Czech Republic)

Architecture and temporal variations of a terrestrial CO2 degassing site using electric resistivity tomography and self-potential

Risk assessment of abandoned wells affected by CO2

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