Royal Dutch Shell Plc
Cove's main asset is an 8.5 percent stake in the Rovuma Offshore Area 1, in Mozambique, where operator Anadarko
The project partners plan to build plants to freeze the gas into liquefied natural gas (LNG) and ship it to Asian markets.
Analysts said the small size of the stake meant Shell would likely approach other parties in the project and offer to buy part of their stakes.
As the number one LNG player, Shell absolutely must be in East Africa... we should assume that 8.5 percent is too small for them, said Irene Himona, oil analyst at Societe Generale.
Shell said it had a firm intention to make a 195 pence per share cash bid, which Cove's directors said on Wednesday they would recommend to shareholders.
Cove's shares jumped 25 percent to trade at 193.07 pence at 1311 GMT. Shell's shares were flat, in line while the STOXX Europe 600 Oil and Gas index <.SXEP> traded down 0.4 percent.
Analysts at Citigroup agreed the deal made sense for Shell but said the valuation looks stretched.
Richard Savage at Mirabaud said in a research note that the price suggested that Shell expected the declared reserves to be increased in time.
Shell's proposed bid is an over 70 percent premium to Cove's closing share price on January 4, when Cove announced plans to sell, although investors were already betting on a bid at that point.
Himona said other bidders could yet emerge and analysts at Westhouse tipped the Korea National Oil Corp
Any deal to buy Cove, which also has interests in Tanzania and Kenya, is subject to Mozambique government approval.
MAJOR NEW FRONTIER
Neighboring the Rovuma find, Italy's Eni
On Tuesday, the Tanzanian government said British gas and oil firm BG Group
Analysts expect Mozambique could emerge as a major centre of LNG export. Bernstein noted that project build costs should be lower in the other emerging LNG province, Australia.
Japan's reduction in focus on nuclear power after the disaster at the Fukishima plant has contributed to expectations that Asia will continue to drive strong LNG prices for years to come despite strong production growth due to shale discoveries.
In addition to Anadarko, Japan's Mitsui <8031.T> and Indian groups Bharat Petroleum
Morgan Stanley advised Shell on the bid, while Standard Chartered advised Cove.
Separately, Shell said Malcom Brinded, the head of Shell's oil and gas exploration and production operations outside the America's, would step down.
Brinded, who was a contender for the Chief Executive role before Peter Voser was appointed in 2009, will be replaced by Andrew Brown, currently head of Shell's operations in Qatar, where two major gas projects have come on line in the past year.
($1=0.6321 British pounds)
(Editing by Mark Potter and Mike Nesbit)