Abstract
The baseline methane for shallow groundwater can provide an important evidence to interpret possible methane stray associated with shale gas exploration. This study investigated and traced methane content and its origin of shallow groundwater in a karst aquifer in the Fuling shale gas block, SW China. The results show that methane contents of shallow groundwater are all less than 0.01 mg L−1 and volumetric content in dissolved gas ranges from not detected to 0.0064%. The δ13C-CH4 ranges from −74.4 to −49.1‰, suggesting biogenic origin. For the first time, the δ13C-CH4 and 3He/4He end-numbers were determined.
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