Assertion: hydrogen sulfide's concentration | /r/HasProperty | observed crude
Facets:
value: in the bakken formation
type: TEMPORAL
Source sentences:
text: In 2011 it was reported that increased concentration of Template:Chem, possibly due to oil field practices, was observed in the Bakken formation crude and presented challenges such as "health and environmental risks, corrosion of wellbore, added expense with regard to materials handling and pipeline equipment, and additional refinement requirements".
text: In 2011 it was reported that increased concentration of H 2 S, possibly due to oil field practices, was observed in the Bakken formation crude and presented challenges such as "health and environmental risks, corrosion of wellbore, added expense with regard to materials handling and pipeline equipment, and additional refinement requirements".