MELBOURNE, Australia—Oil Search Ltd. rejected an all-stock offer from Woodside Petroleum Ltd. that valued the company at about 11.64 billion Australian dollars (US$8.26 billion), derailing a bid to form a regional oil-and-gas champion.

Oil Search in a statement Monday said that after a detailed evaluation of the offer, its board concluded the offer was "highly opportunistic and grossly undervalues" a company with clear growth opportunities and a track record of delivery.

Had it gone ahead, the deal would have been one of the biggest in the oil-and-gas industry since Royal Dutch Shell PLC signed a US$70 billion deal to buy BG Group PLC in April. It might also have kickstarted further mergers and acquisitions in the sector, where many financially-stretched companies are viewed as possible sellers or targets following a more than 50% drop in oil prices since last summer.

Still, Oil Search held the door open to a higher offer, saying it would engage with any proposal that reflected compelling value for shareholders.

Woodside in response said it was disappointed its nonbinding offer had been rejected without Oil Search meeting with the larger Australian oil-and-gas producer to negotiate terms of a possible deal.

For Woodside, which has struggled in recent years to pin down opportunities to continue growing its production, the deal would have increased its bet on natural gas and the continuing growth in Asia's appetite for cleaner-burning fuels at a time of low prices.

Oil Search's main asset is a 29% stake in a US$19 billion liquefied natural gas project in Papua New Guinea known as PNG LNG, which is being led by Exxon Mobil Corp. It also is involved in other gas fields in the poor South Pacific nation, including a large project being developed in partnership with France's Total SA.

The company said its growth opportunities in Papua New Guinea, including the planned expansion of the PNG LNG project, have the scope to double production from current levels by the early 2020s. It added it is well placed to fund these developments, with access to competitively priced project financing from Exxon Mobil, Total and other venture partners.

"We have a low cost, high quality, production base which is generating strong cash flows and excellent growth opportunities," Oil Search Chairman Rick Lee said.

Woodside's offer, comprising one of its shares for every four of Oil Search's, represented a 14% premium to Oil Search's closing share-price the day before the offer was announced last Monday, although shares in both companies had dropped nearly 30% up to that point in 2015. Woodside said that Oil Search's investors, which include Papua New Guinea's government with an almost 10% stake, would have held almost 32% in the merged company.

Several analysts said the approach on its rival highlights Woodside's apparent need to add growth projects to its portfolio of assets, which are largely focused on Australia's west coast. Woodside has repeatedly delayed an investment decision on the massive Browse LNG project off Western Australia, while last year it abandoned a planned US$2.5 billion investment in the Leviathan natural-gas discovery off Israel's coast.

In Australia alone, companies have invested more than US$200 billion in recent years on vast LNG developments that chill gas into a liquid for export. As they begin to export fuel, at prices linked to crude-oil prices, it is adding to the current supply-glut in global gas-markets and adding further stress to some companies' balance sheets despite expectations countries like China will continue to increase demand over the coming years.

Santos Ltd., Australia's fourth-largest oil-and-gas company which has a 13.5% stake in the PNG LNG project, recently said it would consider offers for its assets following a 70% share-price slump. Another Australian company, Origin Energy Ltd., in August unloaded a majority stake in New Zealand power company Contact Energy Ltd. for about US$1.13 billion to cut debt after it borrowed heavily to fund a major LNG project on Australia's east coast.

Oil Search last month reported a record half-year profit, boosted by increased production from the PNG LNG project. It expects output this year of 27 million to 29 million barrels of oil equivalent, while Woodside has forecast output of 86 million to 94 million barrels of oil equivalent this year against 95.1 million in 2014.

Write to Robb M. Stewart at robb.stewart@wsj.com

 

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(END) Dow Jones Newswires

September 13, 2015 21:25 ET (01:25 GMT)

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