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Geochemical evidence for possible natural migration of Marcellus Formation brine to shallow aquifers in Pennsylvania.

Publication ,  Journal Article
Warner, NR; Jackson, RB; Darrah, TH; Osborn, SG; Down, A; Zhao, K; White, A; Vengosh, A
Published in: Proceedings of the National Academy of Sciences of the United States of America
July 2012

The debate surrounding the safety of shale gas development in the Appalachian Basin has generated increased awareness of drinking water quality in rural communities. Concerns include the potential for migration of stray gas, metal-rich formation brines, and hydraulic fracturing and/or flowback fluids to drinking water aquifers. A critical question common to these environmental risks is the hydraulic connectivity between the shale gas formations and the overlying shallow drinking water aquifers. We present geochemical evidence from northeastern Pennsylvania showing that pathways, unrelated to recent drilling activities, exist in some locations between deep underlying formations and shallow drinking water aquifers. Integration of chemical data (Br, Cl, Na, Ba, Sr, and Li) and isotopic ratios ((87)Sr/(86)Sr, (2)H/H, (18)O/(16)O, and (228)Ra/(226)Ra) from this and previous studies in 426 shallow groundwater samples and 83 northern Appalachian brine samples suggest that mixing relationships between shallow ground water and a deep formation brine causes groundwater salinization in some locations. The strong geochemical fingerprint in the salinized (Cl > 20 mg/L) groundwater sampled from the Alluvium, Catskill, and Lock Haven aquifers suggests possible migration of Marcellus brine through naturally occurring pathways. The occurrences of saline water do not correlate with the location of shale-gas wells and are consistent with reported data before rapid shale-gas development in the region; however, the presence of these fluids suggests conductive pathways and specific geostructural and/or hydrodynamic regimes in northeastern Pennsylvania that are at increased risk for contamination of shallow drinking water resources, particularly by fugitive gases, because of natural hydraulic connections to deeper formations.

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Published In

Proceedings of the National Academy of Sciences of the United States of America

DOI

EISSN

1091-6490

ISSN

0027-8424

Publication Date

July 2012

Volume

109

Issue

30

Start / End Page

11961 / 11966

Related Subject Headings

  • Water Supply
  • Water Pollutants, Chemical
  • Water Movements
  • Strontium Isotopes
  • Salts
  • Radium
  • Pennsylvania
  • Mass Spectrometry
  • Isotopes
  • Groundwater
 

Citation

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Warner, N. R., Jackson, R. B., Darrah, T. H., Osborn, S. G., Down, A., Zhao, K., … Vengosh, A. (2012). Geochemical evidence for possible natural migration of Marcellus Formation brine to shallow aquifers in Pennsylvania. Proceedings of the National Academy of Sciences of the United States of America, 109(30), 11961–11966. https://doi.org/10.1073/pnas.1121181109
Warner, Nathaniel R., Robert B. Jackson, Thomas H. Darrah, Stephen G. Osborn, Adrian Down, Kaiguang Zhao, Alissa White, and Avner Vengosh. “Geochemical evidence for possible natural migration of Marcellus Formation brine to shallow aquifers in Pennsylvania.Proceedings of the National Academy of Sciences of the United States of America 109, no. 30 (July 2012): 11961–66. https://doi.org/10.1073/pnas.1121181109.
Warner NR, Jackson RB, Darrah TH, Osborn SG, Down A, Zhao K, et al. Geochemical evidence for possible natural migration of Marcellus Formation brine to shallow aquifers in Pennsylvania. Proceedings of the National Academy of Sciences of the United States of America. 2012 Jul;109(30):11961–6.
Warner, Nathaniel R., et al. “Geochemical evidence for possible natural migration of Marcellus Formation brine to shallow aquifers in Pennsylvania.Proceedings of the National Academy of Sciences of the United States of America, vol. 109, no. 30, July 2012, pp. 11961–66. Epmc, doi:10.1073/pnas.1121181109.
Warner NR, Jackson RB, Darrah TH, Osborn SG, Down A, Zhao K, White A, Vengosh A. Geochemical evidence for possible natural migration of Marcellus Formation brine to shallow aquifers in Pennsylvania. Proceedings of the National Academy of Sciences of the United States of America. 2012 Jul;109(30):11961–11966.
Journal cover image

Published In

Proceedings of the National Academy of Sciences of the United States of America

DOI

EISSN

1091-6490

ISSN

0027-8424

Publication Date

July 2012

Volume

109

Issue

30

Start / End Page

11961 / 11966

Related Subject Headings

  • Water Supply
  • Water Pollutants, Chemical
  • Water Movements
  • Strontium Isotopes
  • Salts
  • Radium
  • Pennsylvania
  • Mass Spectrometry
  • Isotopes
  • Groundwater