As the world runs out of fossil fuels and looks out for alternate sources of clean energy, there is good news from the Krishna-Godavari (KG) basin. The methane hydrate deposit in this basin is a rich source that will ensure adequate supplies of methane, a natural gas.

Methane is a clean and economical fuel. It is estimated that one cubic meter of methane hydrate contains 160-180 cubic meters of methane. Even the lowest estimate of methane present in the methane hydrates in KG Basin is twice that of all fossil fuel reserves available worldwide.

Studies so far

As per the study conducted by researchers at the Agharkar Research Institute (ARI), an autonomous institute of the Department of Science and Technology, Govt. of India have found that the methane hydrate deposits are located in the Krishna-Godavari (KG) basin are of biogenic origin. Methane hydrate is formed when hydrogen-bonded water and methane gas come into contact at high pressures and low temperatures in oceans. It has further identified the methanogens that produced the biogenic methane trapped as methane hydrate, which can be a significant source of energy.

This study has shown that methanogens under these elevated pressure and temperature conditions are well adapted to these conditions and are different in methane-producing activities. Understanding of these methane-producing methanogenic communities under such an extreme and pristine environment was very important. 

The study using molecular and culturing techniques revealed maximum methanogenic diversity in the KG basin, which is one of the prominent reasons to confirm it to be the extreme source of biogenic methane in comparison to the Andaman and Mahanadi basins.

The kinetics study based on their model also predicted the rate of biogenic methane generation in KG Basin hydrates to be 0.031 millimoles methane/gTOC/Day, resulting in total deposits of methane around 0.56 to 7.68trillion cubic feet (TCF).

(The author is a trainer for Civil Services aspirants. The views expressed here are personal.)