Sentences with phrase «where higher methane concentrations»

So far our data do not show any evidence for rapid water contamination, as we do not see evidence of these diluted brines (type D water) associated with distance to natural gas wells (the Osborn 2011 paper) in wells where higher methane concentrations were observed.

Not exact matches

No random sampling; authors appear to have simply cherry - picked water wells previously known to have high concentrations of methane, although they never actually mention in the report which wells they sampled or where they're located: «Jackson said the study was indeed not random, but that was because they needed homeowners permission to test their water.»

This is about as far as one could get from high levels (relative to most atmospheric concentrations) of methane over large areas high in the atmosphere in the Arctic where there is very little (direct) human activity.

«Methane migration through the 1 - to 2 - km - thick geological formations that overlie the Marcellus and Utica shales is less likely as a mechanism for methane contamination than leaky well casings, but might be possible due to both the extensive fracture systems reported for these formations and the many older, uncased wells drilled and abandoned over the last century and a half in Pennsylvania and New York [where they did their study]... More research is needed across this and other regions to determine the mechanism (s) controlling the higher methane concentrations we observed.Methane migration through the 1 - to 2 - km - thick geological formations that overlie the Marcellus and Utica shales is less likely as a mechanism for methane contamination than leaky well casings, but might be possible due to both the extensive fracture systems reported for these formations and the many older, uncased wells drilled and abandoned over the last century and a half in Pennsylvania and New York [where they did their study]... More research is needed across this and other regions to determine the mechanism (s) controlling the higher methane concentrations we observed.methane contamination than leaky well casings, but might be possible due to both the extensive fracture systems reported for these formations and the many older, uncased wells drilled and abandoned over the last century and a half in Pennsylvania and New York [where they did their study]... More research is needed across this and other regions to determine the mechanism (s) controlling the higher methane concentrations we observed.methane concentrations we observed.»

NATURALLY OCCURRING METHANE CAPTURE — Methane emissions may occur from land areas where coal or other high concentrations of un-extracted fossil fuels are present underground, resulting in a naturally occurring source of greenhouse gas (GHG) emiMETHANE CAPTURE — Methane emissions may occur from land areas where coal or other high concentrations of un-extracted fossil fuels are present underground, resulting in a naturally occurring source of greenhouse gas (GHG) emiMethane emissions may occur from land areas where coal or other high concentrations of un-extracted fossil fuels are present underground, resulting in a naturally occurring source of greenhouse gas (GHG) emissions.

Naturally Occurring Methane Capture Carbon Offsets — Methane emissions may occur from land areas where coal or other high concentrations of un-extracted fossil fuels are present underground, resulting in a naturally occurring source of GHG emissions.

There are probably «blooms» of methanotrophs where the concentrations are high, and mixed populations of microbes of wildly varing composition across the methane / oxygen / temperature gradients.