Methane Sources and Migration Mechanisms in Shallow Groundwaters in Parker and Hood Counties, Texas - A Heavy Noble Gas Analysis
This study places constraints on the source and transport mechanisms of methane found in groundwater within the Barnett Shale footprint in Texas using dissolved noble gases, with particular emphasis on ^sup 84^Kr and 132Xe. Dissolved methane concentrations are positively correlated with crustal ^sup...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Tao Wen [verfasserIn] |
|---|
| Format: |
Artikel |
|---|---|
| Sprache: |
Englisch |
| Erschienen: |
2016 |
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| Schlagwörter: |
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| Übergeordnetes Werk: |
Enthalten in: Environmental science & technology - Washington, DC : ACS Publ., 1967, 50(2016), 21, Seite 12012 |
|---|---|
| Übergeordnetes Werk: |
volume:50 ; year:2016 ; number:21 ; pages:12012 |
| Links: |
|---|
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| 245 | 1 | 0 | |a Methane Sources and Migration Mechanisms in Shallow Groundwaters in Parker and Hood Counties, Texas - A Heavy Noble Gas Analysis |
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| 520 | |a This study places constraints on the source and transport mechanisms of methane found in groundwater within the Barnett Shale footprint in Texas using dissolved noble gases, with particular emphasis on ^sup 84^Kr and 132Xe. Dissolved methane concentrations are positively correlated with crustal ^sup 4^He, ^sup 21^Ne, and ^sup 40^Ar and suggest that noble gases and methane originate from common sedimentary strata, likely the Strawn Group. In contrast to most samples, four water wells with the highest dissolved methane concentrations unequivocally show strong depletion of all atmospheric noble gases (^sup 20^Ne, ^sup 36^Ar, ^sup 84^Kr, ^sup 132^Xe) with respect to air-saturated water (ASW). This is consistent with predicted noble gas concentrations in a water phase in contact with a gas phase with initial ASW composition at 18 °C-25 °C and it suggests an in situ, highly localized gas source. All of these four water wells tap into the Strawn Group and it is likely that small gas accumulations known to be present in the shallow subsurface were reached. Additionally, lack of correlation of ^sup 84^Kr/^sup 36^Ar and ^sup 132^Xe/^sup 36^Ar fractionation levels along with ^sup 4^He/^sup 20^Ne with distance to the nearest gas production wells does not support the notion that methane present in these groundwaters migrated from nearby production wells either conventional or using hydraulic fracturing techniques. | ||
| 650 | 4 | |a Temperature effects | |
| 650 | 4 | |a Methane | |
| 650 | 4 | |a Wells | |
| 650 | 4 | |a Fluid dynamics | |
| 650 | 4 | |a Sediment transport | |
| 650 | 4 | |a Groundwater | |
| 650 | 4 | |a Hydraulic fracturing | |
| 700 | 0 | |a M Clara Castro |4 oth | |
| 700 | 0 | |a Jean-Philippe Nicot |4 oth | |
| 700 | 0 | |a Chris M Hall |4 oth | |
| 700 | 0 | |a Toti Larson |4 oth | |
| 700 | 0 | |a Patrick Mickler |4 oth | |
| 700 | 0 | |a Roxana Darvari |4 oth | |
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Tao Wen @@aut@@ M Clara Castro @@oth@@ Jean-Philippe Nicot @@oth@@ Chris M Hall @@oth@@ Toti Larson @@oth@@ Patrick Mickler @@oth@@ Roxana Darvari @@oth@@ |
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methane sources and migration mechanisms in shallow groundwaters in parker and hood counties, texas - a heavy noble gas analysis |
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Methane Sources and Migration Mechanisms in Shallow Groundwaters in Parker and Hood Counties, Texas - A Heavy Noble Gas Analysis |
| abstract |
This study places constraints on the source and transport mechanisms of methane found in groundwater within the Barnett Shale footprint in Texas using dissolved noble gases, with particular emphasis on ^sup 84^Kr and 132Xe. Dissolved methane concentrations are positively correlated with crustal ^sup 4^He, ^sup 21^Ne, and ^sup 40^Ar and suggest that noble gases and methane originate from common sedimentary strata, likely the Strawn Group. In contrast to most samples, four water wells with the highest dissolved methane concentrations unequivocally show strong depletion of all atmospheric noble gases (^sup 20^Ne, ^sup 36^Ar, ^sup 84^Kr, ^sup 132^Xe) with respect to air-saturated water (ASW). This is consistent with predicted noble gas concentrations in a water phase in contact with a gas phase with initial ASW composition at 18 °C-25 °C and it suggests an in situ, highly localized gas source. All of these four water wells tap into the Strawn Group and it is likely that small gas accumulations known to be present in the shallow subsurface were reached. Additionally, lack of correlation of ^sup 84^Kr/^sup 36^Ar and ^sup 132^Xe/^sup 36^Ar fractionation levels along with ^sup 4^He/^sup 20^Ne with distance to the nearest gas production wells does not support the notion that methane present in these groundwaters migrated from nearby production wells either conventional or using hydraulic fracturing techniques. |
| abstractGer |
This study places constraints on the source and transport mechanisms of methane found in groundwater within the Barnett Shale footprint in Texas using dissolved noble gases, with particular emphasis on ^sup 84^Kr and 132Xe. Dissolved methane concentrations are positively correlated with crustal ^sup 4^He, ^sup 21^Ne, and ^sup 40^Ar and suggest that noble gases and methane originate from common sedimentary strata, likely the Strawn Group. In contrast to most samples, four water wells with the highest dissolved methane concentrations unequivocally show strong depletion of all atmospheric noble gases (^sup 20^Ne, ^sup 36^Ar, ^sup 84^Kr, ^sup 132^Xe) with respect to air-saturated water (ASW). This is consistent with predicted noble gas concentrations in a water phase in contact with a gas phase with initial ASW composition at 18 °C-25 °C and it suggests an in situ, highly localized gas source. All of these four water wells tap into the Strawn Group and it is likely that small gas accumulations known to be present in the shallow subsurface were reached. Additionally, lack of correlation of ^sup 84^Kr/^sup 36^Ar and ^sup 132^Xe/^sup 36^Ar fractionation levels along with ^sup 4^He/^sup 20^Ne with distance to the nearest gas production wells does not support the notion that methane present in these groundwaters migrated from nearby production wells either conventional or using hydraulic fracturing techniques. |
| abstract_unstemmed |
This study places constraints on the source and transport mechanisms of methane found in groundwater within the Barnett Shale footprint in Texas using dissolved noble gases, with particular emphasis on ^sup 84^Kr and 132Xe. Dissolved methane concentrations are positively correlated with crustal ^sup 4^He, ^sup 21^Ne, and ^sup 40^Ar and suggest that noble gases and methane originate from common sedimentary strata, likely the Strawn Group. In contrast to most samples, four water wells with the highest dissolved methane concentrations unequivocally show strong depletion of all atmospheric noble gases (^sup 20^Ne, ^sup 36^Ar, ^sup 84^Kr, ^sup 132^Xe) with respect to air-saturated water (ASW). This is consistent with predicted noble gas concentrations in a water phase in contact with a gas phase with initial ASW composition at 18 °C-25 °C and it suggests an in situ, highly localized gas source. All of these four water wells tap into the Strawn Group and it is likely that small gas accumulations known to be present in the shallow subsurface were reached. Additionally, lack of correlation of ^sup 84^Kr/^sup 36^Ar and ^sup 132^Xe/^sup 36^Ar fractionation levels along with ^sup 4^He/^sup 20^Ne with distance to the nearest gas production wells does not support the notion that methane present in these groundwaters migrated from nearby production wells either conventional or using hydraulic fracturing techniques. |
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