Methane concentrations in water wells unrelated to proximity to existing oil and gas wells in northeastern Pennsylvania

Donald I. Siegel, Nicholas A. Azzolina, Bert J. Smith, A. Elizabeth Perry, Rikka L. Bothun

Research output: Contribution to journalArticle

81 Scopus citations

Abstract

Recent studies in northeastern Pennsylvania report higher concentrations of dissolved methane in domestic water wells associated with proximity to nearby gas-producing wells [ Osborn et al. Proc. Natl. Acad. Sci. U. S. A. 2011, 108, 8172 ] and [ Jackson et al. Proc. Natl. Acad. Sci. U. S. A., 2013, 110, 11250 ]. We test this possible association by using Chesapeake Energys baseline data set of over 11,300 dissolved methane analyses from domestic water wells, densely arrayed in Bradford and nearby counties (Pennsylvania), and near 661 pre-existing oil and gas wells. The majority of these, 92%, were unconventional wells, drilled with horizontal legs and hydraulically fractured. Our data set is hundreds of times larger than data sets used in prior studies. In contrast to prior findings, we found no statistically significant relationship between dissolved methane concentrations in groundwater from domestic water wells and proximity to pre-existing oil or gas wells. Previous analyses used small sample sets compared to the population of domestic wells available, which may explain the difference in prior findings compared to ours.

Original languageEnglish (US)
Pages (from-to)4106-4112
Number of pages7
JournalEnvironmental Science and Technology
Volume49
Issue number7
DOIs
StatePublished - Apr 7 2015

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

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