Distribution, composition and origin of coalbed gases in excavation fields from the Preloge and Pesje mining areas, Velenje Basin, Slovenia

Lazar, Jerneja; Kanduč, Tjaša; Jamnikar, Sergej; Grassa, Fausto; Zavšek, Simon

doi:10.1016/j.coal.2014.05.007

Cited by 15 publications

(14 citation statements)

References 46 publications

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“…87 Sr is produced by the decay of 87 Rb with a half-life of 48.8 Ga (Faure, 1991 (Faure, 1991;Mcnutt, 2000). The geochemical and isotopic composition of carbon and 87 Sr/ 86 Sr isotopes of groundwater in the Velenje Basin, combined with mineralogical information, are applied to investigate the groundwater-rock interactions and geochemical processes that contribute to understanding the generation and source of coal seam gases, namely carbon dioxide and methane (KanDuč et al, 2012;seDlar et al, 2014;KanDuč et al, 2015A).…”

Section: Hydrogeochemistrymentioning

confidence: 99%

Hydrogeochemistry and isotope geochemistry of Velenje Basin groundwater

Kanduč¹,

Mori²,

Koceli³

et al. 2016

Geologija

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The geochemical and isotopic composition of groundwater in the Velenje Basin, Slovenia, was investigated between the years 2014 to 2015 to identify the geochemical processes in the major aquifers (Pliocene and Triassic) and the water-rock interactions. Thirty-eight samples of groundwater were taken from the aquifers, 19 in the mine and 19 from the surface. Groundwater in the Triassic aquifer is dominated by HCO , and Si, and has high alkalinity, with δ 13C DIC values in the range of -14.4 to +4.6 ‰. Based on the δ 13C DIC values in all the aquifers (Pliocene and Triassic), both processes influence the dissolution of carbonate minerals and dissolution of organic matter and in the Pliocene aquifers, methanogenesis as well. Based on Principal Component Analysis (PCA), and on geochemical and isotopic data we conclude that the following types of groundwater in Velenje Basin are present: Triassic aquifers with higher pH and lower conductivity and chloride, Pliocene, Pliocene 1 and Pliocene 2 aquifers with lower pH and higher conductivity and chloride contents, and Pliocene 3 and Pliocene 2, 3 aquifers with the highest pH values and lowest conductivities and chloride contents.

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Section: Hydrogeochemistrymentioning

confidence: 99%

Hydrogeochemistry and isotope geochemistry of Velenje Basin groundwater

Kanduč¹,

Mori²,

Koceli³

et al. 2016

Geologija

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“…The values of δ 13 C CO2 range from -18 to -6.4 ‰, depending on the source (Figure 3 B). The δ 13 C CO2 values that approach -6.4 ‰ (location Paka, South Preloge mine) could reflect bacterial CO 2 and/or endogenic CO 2 from underground coalmine activity (LAZAr et al, 2014), while values approaching -18 ‰ (Škalsko and Velenjsko jezero in November 2011) could be attributed to anthropogenic 2011 17.4.2011 6.6.2011 26.7.2011 14.9.2011 3.11.2011 23.12.2011 Temperature ( . The characteristic value of δ 13 C CO2 for a coal-burning chimney is -24.1 ‰ and is much lower in comparison to δ 13 C CO2 values in our study, where δ 13 C CO2 ranges from -18.0 to -6.4 ‰ ( Table 1).…”

Section: Resultsmentioning

confidence: 99%

Isotopic composition of carbon in atmospheric air; use of a diffusion model at the water/atmosphere interface in Velenje Basin

Kanduč¹

2015

Geologija

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Klju~ne besede: atmosferski ogljikov dioksid, ogljikovi izotopi, fazna meja zrak/voda, difuzijski model, Velenjski bazen, termoelektrarna, antropogeni vpliv Abstract CO 2 concentrations (partial pressure of CO 2 , pCO 2 ), and isotope compositions of carbon dioxide in air (δ 13 C CO2 ), temperature (T) and relative humidity (H) have been measured in the atmosphere in the Velenje Basin. Samples were collected monthly in the calendar year 2011 from 9 locations in the area where the largest thermal power plant in Slovenia with the greatest emission of CO 2 to the atmosphere (around 4M t/year) is located. Values of pCO 2 ranged from 239 to 460 ppm with an average value of 294 ppm, which is below the average atmospheric CO 2 pressure (360 ppm). δ 13 C CO2 ranged from -18.0 to -6.4 ‰, with an average value of -11.7 ‰. These values are similar to those measured in Wroclaw, Poland. We performed the comparison of δ 13 C CO2 values in atmospheric air with Wroclaw since researchers used similar approach to trace δ 13 C CO2 around anthropogenic sources. The isotopic composition of dissolved inorganic carbon (δ 13 C DIC ) in rivers and lakes from the Velenje basin changes seasonally from -13.5 to -7.1‰. The values of δ 13 C DIC indicate the occurrence of biogeochemical processes in the surface waters, with dissolution of carbonates and degradation of organic matter being the most important. A concentration and diffusion model was used to calculate the time of equilibration between dissolved inorganic carbon in natural sources (rivers) and atmospheric CO 2 . Izvle~ekTa {tudija opisuje rezultate analize koncentracij CO 2 v zraku (parcialni tlak CO 2 , pCO 2 ) in izotopske sestave ogljika v atmosferskem zraku (δ 13 C CO2 ), temperature (T) in relativne vlažnosti (H) v atmosferi iz Velenjskega bazena. Vzorce smo vzor~ili mese~no na 9 lokacijah v koledarskem letu 2011 na obmo~ju Velenjskega bazena, kjer je locirana najve~ja termoelektrarna v Sloveniji, ki predstavlja najve~jega proizvajalca emisij CO 2 v atmosfero (okoli 4 Mt/leto). Koncentracije pCO 2 v zraku se v ~asu te {tudije spreminjajo od 239 do 460 ppm. Merjene povpre~ne koncentracije pCO 2 v na{i {tudiji zna{ajo 294 ppm in so pod povpre~nim atmosferskim tlakom CO 2 , ki zna{a 360 ppm. Merjena δ 13 C CO2 se spreminja od -18,0 do -6,4 ‰ s povpre~no vrednostjo δ 13 C CO2 -11,7 ‰. Vrednosti atmosferskega CO 2 in δ 13 C CO2 so v ~asu te raziskave podobne vrednostim objavljenim za Wroclaw, Poljska. Naredili smo primerjavo z δ 13 C CO2 vrednostmi v atmosferskem zraku z Wroclawom, ker so raziskovalci uporabili podoben pristop sledenja δ 13 C CO2 vrednosti okrog antropogenih virov. Izotopska sestava raztopljenega anorganskega ogljika (δ 13 C DIC ) v rekah in jezerih Velenjskega bazena se je v letu 2011 sezonsko spreminjala od -13,5 do -7,1 ‰. Vrednosti δ 13 C DIC odražajo biogeokemijske procese v povr{inskih vodah, med katerimi sta najpomembnej{a raztapljanje karbonatov in razgradnja organske snovi. Izdelali smo tudi koncentracijski in izotopski difuzijski model za izra~un ~asa u...

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“…Velenje coal seam, owing to its top coal caving heights (up to 15 m) and extraction of the lignite in front of the hydraulic shields [27]. The rate at which the lignite can be excavated using this method depends on several factors, one of which is the amount of coalbed gas released since high advancement rates (> 9 m per day) significantly increase the risk of gas outbursts [28][29][30].…”

Section: Velenje Longwall Mining Methods (Vlmm)mentioning

confidence: 99%

Exploring the 2013–2018 degassing mechanism from the Pesje and Preloge excavation fields in the Velenje Coal basin, Slovenia: insights from molecular composition and stable isotopes

Kanduč

Sedlar

Novak

et al. 2021

Isotopes in Environmental and Health Studies

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Gas samples were collected from 25 m long horizontal boreholes drilled into the excavation field at 10°inclination to the longwall face in two mining areas, Pesje and Preloge, in the Velenje Coal Mine, Slovenia, from 2013 to 2018. The degassing mechanism of coalbed gas and its stable isotopic composition (δ 13 C CO2 , δ 13 C CH4 , and δ 2 H CH4 ) were investigated in boreholes in advance of eight working faces. The major coalbed gas constituents were CO 2 and methane. Gas concentrations and isotope values revealed that the methane is biogenic in origin with δ 13 C CH4 values of −69.4 to −29.5 ‰, δ 2 H CH4 values of −301 to −222 ‰, and a fractionation factor (α CO2 -CH4 ) of 0.998-1.073, suggesting that methane derives from microbial acetate fermentation and CO 2 reduction. The carbon dioxide methane index values ranged from 50.0-98.3 vol.% and δ 13 C CO2 values from −11.8 to −0.5 ‰, indicating that CO 2 is biogenic and endogenic in origin. The degassing mechanism results in isotope fractionation of methane and CO 2 for carbon isotopes up to 39.9 ‰ and up to 8.5 ‰, respectively, depending on the position of the excavation fields in space, e.g. under pre-mined coal area, fresh overburden.

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Distribution, composition and origin of coalbed gases in excavation fields from the Preloge and Pesje mining areas, Velenje Basin, Slovenia

Cited by 15 publications

References 46 publications

Hydrogeochemistry and isotope geochemistry of Velenje Basin groundwater

Hydrogeochemistry and isotope geochemistry of Velenje Basin groundwater

Isotopic composition of carbon in atmospheric air; use of a diffusion model at the water/atmosphere interface in Velenje Basin

Exploring the 2013–2018 degassing mechanism from the Pesje and Preloge excavation fields in the Velenje Coal basin, Slovenia: insights from molecular composition and stable isotopes

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