October 5 2011 at 05:00am
By Jan Willem Eggink, General Manager Upstream Operations, Shell South Africa
Some of you may have seen this image on television or the internet. A man reaches across and turns on his kitchen tap. He takes a lighter and applies it to the stream of water, it bursts into flame. The flame is attributed to the presence of methane gas.
It is a powerful image. But it is important to be clear about the source of the gas. While critics suggest natural gas drilling as the cause, there is considerable evidence that dissolved methane can occur naturally in ground water. Indeed, according to the Department of Water Affairs, methane gas has been found in shallow water wells in the Karoo. read more
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