Soil gas data acquisition is essential for initial identification and preliminary quantification of natural hydrogen. However, these readings may be skewed by atmospheric air contamination, resulting in elevated nitrogen and CO2 readings. 

Drilling shallow wells for more objective readings of hydrogen concentrations, along with the GC and isotopic geochemistry adds a lot to the AOI acreage prospectivity picture.

Shallow drilling campaign may also be for obtaining samples for soil degassing tests.