Noble Gases and Methane in Texas Groundwater

This Waterlines episode discusses a 2016 study of methane in shallow groundwater wells in Parker and Hood Counties, Texas, within the Barnett Shale region. The paper uses dissolved noble gases—especially krypton and xenon—alongside methane and well-log information to evaluate whether methane in sampled water wells likely came from deep production wells, shallow natural accumulations, or other pathways. The researchers found that methane and crustal noble gases often varied together, pointing to a common sedimentary source, likely the Strawn Group. In four high-methane wells, atmospheric noble gases were strongly depleted in a pattern consistent with local gas-water contact, suggesting small shallow gas accumulations reached by wells that penetrate the Strawn Group. The study did not find a correlation between noble-gas indicators and distance to nearby gas production wells, so its data did not support methane migration from nearby Barnett or Strawn production wells in this sample set.Full paper citation: Wen, Tao, M. Clara Castro, Jean-Philippe Nicot, Chris M. Hall, Toti Larson, Patrick Mickler, and Roxana Darvari. 2016. “Methane Sources and Migration Mechanisms in Shallow Groundwaters in Parker and Hood Counties, Texas—A Heavy Noble Gas Analysis.” Environmental Science & Technology 50 (21): 12012–12021. https://doi.org/10.1021/acs.est.6b01494.Disclosure: This episode package is designed for a podcast using AI-generated voices; the hosts you hear are not human recordings.