SYDNEY--Woodside Petroleum Ltd. (WPL.AU) said it would renegotiate a deal to buy a stake in the world's biggest deepwater natural gas find in a decade, including paying a higher price than previously planned.

The Australian company has signed an initial agreement with owners of the Leviathan natural gas field offshore Israel, which include Noble Energy Inc. (NBL) and Delek Drilling L.P. (DEDR.L.TV), to take a 25% stake in the asset. A previous deal agreed in December, 2012, involved Woodside purchasing 30% of the discovery.

The move reflects higher estimates of the size of the Leviathan discovery. Investors now think the field may have as much as 18.9 trillion cubic feet of natural gas, compared with an earlier assessment of 17 trillion cubic feet.

Woodside said the parties plan to negotiate a "fully termed" agreement by Mar. 27.

The Perth-based company has been scouring the world to buy oil and natural gas discoveries after a series of setbacks in Australia, including a delay to the multibillion dollar Browse liquefied natural gas project, that has raised doubts about its ability to grow output over the next few years.

The memorandum of understanding involves Woodside making an upfront payment of US$850 million to get involved in Leviathan, compared to a previous US$696 million.

Another US$850 million payment would occur if a final investment decision is made to build a liquefied natural gas, or LNG, terminal to export some of the resource. Further payments would include 5.75% of Woodside's export gas revenue capped at US$1.3 billion, a royalty of 2.5% paid on oil production, and a one-time payment of US$50 million if the resource estimate rises above 20 trillion cubic feet.

Natural gas from Leviathan would used to meet Israel's domestic needs, and potentially supply foreign consumers, Woodside said.

Write to Ross Kelly at ross.kelly@wsj.com

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