Methane Sources and Migration Mechanisms in Shallow Groundwaters in Parker and Hood Counties, Texas—A Heavy Noble Gas Analysis
| Autor: | Chris M. Hall, Patrick J. Mickler, Roxana Darvari, Toti E. Larson, Jean-Philippe Nicot, Tao Wen, M. Clara Castro |
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| Rok vydání: | 2016 |
| Předmět: |
Water Wells
0208 environmental biotechnology Geochemistry 02 engineering and technology 010501 environmental sciences 01 natural sciences Methane Gas phase chemistry.chemical_compound Phase (matter) Environmental Chemistry Oil and Gas Fields Groundwater 0105 earth and related environmental sciences Hydrology geography geography.geographical_feature_category Noble gas General Chemistry Texas 020801 environmental engineering chemistry Sedimentary rock Oil shale Geology Water well |
| Zdroj: | Environmental Science & Technology. 50:12012-12021 |
| ISSN: | 1520-5851 0013-936X |
| DOI: | 10.1021/acs.est.6b01494 |
| Popis: | 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 84Kr and 132Xe. Dissolved methane concentrations are positively correlated with crustal 4He, 21Ne, and 40Ar 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 (20Ne, 36Ar, 84Kr, 132Xe) 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. Add... |
| Databáze: | OpenAIRE |
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