By Ross Kelly 

SYDNEY-- Woodside Petroleum Ltd. abandoned plans to buy part of a large natural-gas discovery offshore Israel for up to US$2.5 billion, raising fresh concerns about its ability to increase production following several big setbacks in Australia.

Woodside's decision to walk away followed more than a year of talks with the owners of the gas discovery, known as Leviathan, which include Noble Energy Inc. and Delek Drilling LP. A deal was initially held up while the Israeli government drew up a policy for gas exports, and delayed further while the Leviathan companies overhauled plans to develop a field estimated to contain 18.9 trillion cubic feet of natural gas.

Leviathan--one of the world's biggest deep water gas discoveries in a decade--could transform Israel, a country largely dependent on energy imports, and give it a new economic advantage over neighbors in the Middle East. Planned to come online in 2017, Leviathan's development comes as Europe debates the security of its energy supply in the wake of geopolitical tensions involving Russia and Ukraine.

To Woodside, the purchase of a minority stake in Leviathan also had the potential to be transformational. The company is heavily reliant on exports of oil and natural gas from Australia, but has few options to lift its output there. Hopes of expanding the Pluto LNG terminal in Australia were dashed when Woodside failed to find enough gas, while a decision to build another gas-export project nearby--Browse--has been delayed by a minimum of two years.

The Leviathan deal was to be the biggest among a string of overseas acquisitions by Woodside in countries ranging from Myanmar to Ireland, as Chief Executive Peter Coleman looked to find new reserves of oil and gas to offset its challenges in Australia.

Woodside, Australia's second-biggest oil producer behind BHP Billiton Ltd., initially agreed to take a 30% stake in Leviathan, but the terms of the deal were changed in February after a new estimate of the field's size. It agreed then to take a 25% stake for $850 million, followed by milestone payments that hinged on the development of the resource.

Early ideas for development included a gas-export facility in Cyprus, giving Woodside an opportunity to use its expertise in producing liquefied natural gas, or LNG, for export at large refrigeration terminals that typically cost tens of billions of dollars to build.

Israel, however, is exploring the option of piping Leviathan gas to neighbors including Jordan after its government approved the export of up to 40% of the field's reserves. Noble has also advocated piping it under the sea to Turkey, rather than investing in a costly LNG plant.

"The plans for development of the Leviathan discovery have significantly changed since we began the search for a partner approximately two years ago," Charles D. Davidson, Noble's chairman and chief executive said.

Woodside said negotiations didn't reach a commercially acceptable outcome, but didn't elaborate.

Mr. Coleman must now decide whether to return surplus cash to shareholders, or use it to buy another asset. Analysts at broker Macquarie Group last week warned that Woodside's earnings could fall by 35% over the balance of the decade if it doesn't commit to building new projects, or make an acquisition.

"They need to look at a combination of a capital return to shareholders, like a special dividend, and an acquisition," said Brad King, portfolio manager at fund manager Armytage Private.

Deals are complicated by rising global share markets, which make potential acquisition targets more expensive than a few years ago, Mr. King said. "They may have to look at the smaller end of the market for bolt-ons, perhaps in Australia's Cooper Basin or in the U.S."

Australian fund manager Equity Trustees last week sold all the Woodside stock in its growth fund, because it couldn't see a catalyst to rev up earnings. It now only owns Woodside shares in its income fund.

"When its payout ratio became 80%--twice its global peers--we saw very limited opportunity for growth of earnings," said George Boubouras, Equity Trustees's chief investment officer.

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

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