US energy major Chevron Corporation will buy up to 40% stake in Reliance Industries gas rich D-6 block in the Krishan-Godavari (KG) basin, and become a co-promoter of its new export-oriented refinery.Reliance sources said Chevron will invest 40% of the development cost for bringing to production the 14.5 trillion cubic feet gas field off the Andhra coast.Chevron, which currently has a lubricant blending and marketing operation in India, has been looking at partnering Reliance for marketing natural gas produced from the D-6 field.
