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Table 3.

Hydrocarbon basins with prior published CH4 microseepage measurements. DOI: https://doi.org/10.1525/elementa.2020.00066.t3

Hydrocarbon BasinStudiesStudy RegionNumber of MeasurementsAverage Microseepage Flux (mg CH4 m–2 day–1)Median Microseepage Flux (mg CH4 m–2 day–1)
Tarim Tang et al. (2007, 2010, 2017) Northwest China 100 11.6 1.80 
Alps Etiope (2005), Etiope et al. (2019), Etiope and Klusman (2010), Sciarra et al. (2013)  Italy 372 231.0 5.72 
Pannonian-Transylvanian Etiope (2005)  Central Romania 23.5 11.0 
Peloponnesus Etiope et al. (2006, 2019) Kalamata, Greece 27 7.66 4.0 
Powder River Klusman et al., (2000), Klusman (2005)  Wyoming, United States 198 0.0977 0.129 
Railroad Valley Etiope et al. (2019), Klusman et al. (2000)  Nevada, United States 124 –0.0230 0.110 
Denver-Julesurg Etiope et al. (2019), Klusman et al. (2000)  Colorado, United States 252 0.459 0.655 
Piceance Klusman et al., (2000), Klusman (2003)  Colorado, United States 306 11.6 0.0593 
Raton LT Environmental (2007)  Colorado, United States 60 1,290 576 
Gulf Coast Etiope et al. (2019)  Texas, United States 65 0.246 -0.767 
N = 9 N = 12 N = 8 N = 1,509   
Appalachian This study Western New York State, United States 47 –0.606 –0.202 
Hydrocarbon BasinStudiesStudy RegionNumber of MeasurementsAverage Microseepage Flux (mg CH4 m–2 day–1)Median Microseepage Flux (mg CH4 m–2 day–1)
Tarim Tang et al. (2007, 2010, 2017) Northwest China 100 11.6 1.80 
Alps Etiope (2005), Etiope et al. (2019), Etiope and Klusman (2010), Sciarra et al. (2013)  Italy 372 231.0 5.72 
Pannonian-Transylvanian Etiope (2005)  Central Romania 23.5 11.0 
Peloponnesus Etiope et al. (2006, 2019) Kalamata, Greece 27 7.66 4.0 
Powder River Klusman et al., (2000), Klusman (2005)  Wyoming, United States 198 0.0977 0.129 
Railroad Valley Etiope et al. (2019), Klusman et al. (2000)  Nevada, United States 124 –0.0230 0.110 
Denver-Julesurg Etiope et al. (2019), Klusman et al. (2000)  Colorado, United States 252 0.459 0.655 
Piceance Klusman et al., (2000), Klusman (2003)  Colorado, United States 306 11.6 0.0593 
Raton LT Environmental (2007)  Colorado, United States 60 1,290 576 
Gulf Coast Etiope et al. (2019)  Texas, United States 65 0.246 -0.767 
N = 9 N = 12 N = 8 N = 1,509   
Appalachian This study Western New York State, United States 47 –0.606 –0.202 
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