Microbial Methane Emissions

A new study led by researchers at McGill University has revealed that microbial methane emissions from non-producing oil and gas wells are nearly 1,000 times higher than previously estimated, raising fresh concerns about hidden sources of greenhouse gases.

The study, titled “Origins of Subsurface Methane Leaking from Nonproducing Oil and Gas Wells in Canada,” found that while most methane leaks originate from deep thermogenic sources formed under high temperatures in petroleum reservoirs, the contribution of microbial methane has been significantly underestimated. 

 What is Microbial Methane?

Microbial (biogenic) methane is produced by microorganisms called methanogens in oxygen-deprived (anaerobic) environments.

It plays a crucial role in the global carbon cycle and is commonly generated in:

• Wetlands
• Rice paddies
• Landfills
• Digestive systems of ruminants

 Key Findings

• Methane leakage from abandoned wells includes both thermogenic and microbial sources
• Microbial methane emissions are far higher than earlier estimates
• Study based on 401 non-producing wells, mainly in western Canada
• Over 90% of such wells are located in this region

 Why It MattersMethane is a highly potent greenhouse gas, significantly contributing to global warming. The findings suggest that current emission inventories may be underreporting methane levels, which could affect climate policy and mitigation strategies.

Source: DTE