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Title: Chemical and isotope compositions of shallow groundwater in areas impacted by hydraulic fracturing and surface mining in the Central Appalachian Basin, Eastern United States

Abstract

Here, hydraulic fracturing of shale deposits has greatly increased the productivity of the natural gas industry by allowing it to exploit previously inaccessible reservoirs. Previous research has demonstrated that this practice has the potential to contaminate shallow aquifers with methane (CH4) from deeper formations. This study compares concentrations and isotopic compositions of CH4 sampled from domestic groundwater wells in Letcher County, Eastern Kentucky in order to characterize its occurrence and origins in relation to both neighboring hydraulically fractured natural gas wells and surface coal mines. The studied groundwater showed concentrations of CH4 ranging from 0.05 mg/L to 10 mg/L, thus, no immediate remediation is required. The δ13C values of CH4 ranged from 66‰ to 16‰, and δ2H values ranged from –286‰ to –86‰, suggesting an immature thermogenic and mixed biogenic/thermogenic origin. The occurrence of CH4 was not correlated with proximity to hydraulically fractured natural gas wells. Generally, CH4 occurrence corresponded with groundwater abundant in Na+, Cl, and HCO3 , and with low concentrations of SO4–2. The CH4 and SO4–2 concentrations were best predicted by the oxidation/reduction potential of the studied groundwater. CH4 was abundant in more reducing waters, and SO4–2 was abundant in more oxidizing waters. Additionally, groundwater in greatermore » proximity to surface mining was more likely to be oxidized. This, in turn, might have increased the likelihood of CH4 oxidation in shallow groundwater.« less

Authors:
 [1];  [1];  [1];  [2];  [1];  [1]
  1. The Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
Work for Others (WFO); USDOE
OSTI Identifier:
1328326
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Applied Geochemistry
Additional Journal Information:
Journal Volume: 71; Journal Issue: C; Journal ID: ISSN 0883-2927
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; methane; groundwater; isotopes; hydraulic fracturing; surface mining

Citation Formats

LeDoux, St. Thomas M., Szynkiewicz, Anna, Faiia, Anthony M., Mayes, Melanie A., McKinney, Michael L., and Dean, William G. Chemical and isotope compositions of shallow groundwater in areas impacted by hydraulic fracturing and surface mining in the Central Appalachian Basin, Eastern United States. United States: N. p., 2016. Web. https://doi.org/10.1016/j.apgeochem.2016.05.007.
LeDoux, St. Thomas M., Szynkiewicz, Anna, Faiia, Anthony M., Mayes, Melanie A., McKinney, Michael L., & Dean, William G. Chemical and isotope compositions of shallow groundwater in areas impacted by hydraulic fracturing and surface mining in the Central Appalachian Basin, Eastern United States. United States. https://doi.org/10.1016/j.apgeochem.2016.05.007
LeDoux, St. Thomas M., Szynkiewicz, Anna, Faiia, Anthony M., Mayes, Melanie A., McKinney, Michael L., and Dean, William G. Tue . "Chemical and isotope compositions of shallow groundwater in areas impacted by hydraulic fracturing and surface mining in the Central Appalachian Basin, Eastern United States". United States. https://doi.org/10.1016/j.apgeochem.2016.05.007. https://www.osti.gov/servlets/purl/1328326.
@article{osti_1328326,
title = {Chemical and isotope compositions of shallow groundwater in areas impacted by hydraulic fracturing and surface mining in the Central Appalachian Basin, Eastern United States},
author = {LeDoux, St. Thomas M. and Szynkiewicz, Anna and Faiia, Anthony M. and Mayes, Melanie A. and McKinney, Michael L. and Dean, William G.},
abstractNote = {Here, hydraulic fracturing of shale deposits has greatly increased the productivity of the natural gas industry by allowing it to exploit previously inaccessible reservoirs. Previous research has demonstrated that this practice has the potential to contaminate shallow aquifers with methane (CH4) from deeper formations. This study compares concentrations and isotopic compositions of CH4 sampled from domestic groundwater wells in Letcher County, Eastern Kentucky in order to characterize its occurrence and origins in relation to both neighboring hydraulically fractured natural gas wells and surface coal mines. The studied groundwater showed concentrations of CH4 ranging from 0.05 mg/L to 10 mg/L, thus, no immediate remediation is required. The δ13C values of CH4 ranged from 66‰ to 16‰, and δ2H values ranged from –286‰ to –86‰, suggesting an immature thermogenic and mixed biogenic/thermogenic origin. The occurrence of CH4 was not correlated with proximity to hydraulically fractured natural gas wells. Generally, CH4 occurrence corresponded with groundwater abundant in Na+, Cl–, and HCO3– , and with low concentrations of SO4–2. The CH4 and SO4–2 concentrations were best predicted by the oxidation/reduction potential of the studied groundwater. CH4 was abundant in more reducing waters, and SO4–2 was abundant in more oxidizing waters. Additionally, groundwater in greater proximity to surface mining was more likely to be oxidized. This, in turn, might have increased the likelihood of CH4 oxidation in shallow groundwater.},
doi = {10.1016/j.apgeochem.2016.05.007},
journal = {Applied Geochemistry},
number = C,
volume = 71,
place = {United States},
year = {2016},
month = {5}
}

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