The Angaro-Lenskoye field in Eastern Siberia has total estimated reserves of 1.22 trillion cubic metres.
If proven, that would put it in the same league as Kovykta, the region's biggest gas field, with reserves of 1.9 trillion cubic metres.
If the field turns out to be another giant, it could have an impact on negotiations by state gas monopoly Gazprom to take a majority stake in Kovykta, which is operated by a unit of TNK-BP.
However,
