TY - JOUR
T1 - Methane concentrations in water wells unrelated to proximity to existing oil and gas wells in northeastern Pennsylvania
AU - Siegel, Donald I.
AU - Azzolina, Nicholas A.
AU - Smith, Bert J.
AU - Perry, A. Elizabeth
AU - Bothun, Rikka L.
N1 - Publisher Copyright:
© 2015 American Chemical Society.
PY - 2015/4/7
Y1 - 2015/4/7
N2 - 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.
AB - 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.
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U2 - 10.1021/es505775c
DO - 10.1021/es505775c
M3 - Article
C2 - 25764141
AN - SCOPUS:84926484879
SN - 0013-936X
VL - 49
SP - 4106
EP - 4112
JO - Environmental Science and Technology
JF - Environmental Science and Technology
IS - 7
ER -