By Sarah Kent 

LONDON-- Royal Dutch Shell PLC's $70 billion offer for Britain's BG Group PLC may be the starting gun for a wave of oil deals that industry observers have been predicting since crude prices started to slump in June, analysts said.

"This could mark the beginning of a M&A rave, much like the one we saw in the late 1990s," Augustin Eden, research analyst at Accendo Markets, said in a note.

BG, with a market cap of about $46 billion, is likely the largest of the potential prey--small, midsize oil-and-gas companies that have been punished by oil prices that have collapsed in half over the past nine months, analysts said.

The world's biggest oil companies have fared somewhat better and will be looking at companies with attractive assets and fallen share prices, analysts said. BG's share price fell more than 20% in the past year before Shell's bid, but others dropped farther: Irish explorer Tullow Oil PLC has slumped around 60% and Premier Oil is down 50%.

Over the same period, the so-called super majors such as Shell have shed only 10% over the same period, thanks to their strong balance sheets and diversified portfolios that include large refining and trading arms.

Tullow and Premier declined to comment.

Until now there have only been small flurries of activity such as the $8.3 billion acquisition of Talisman Energy by Spain's Repsol SA announced in December and the planned $34.6 billion tie up of oil services companies Halliburton Co. and Baker Hughes Inc.

Shell's acquisition of BG would be the largest in the sector since Exxon Corp's tie up with Mobil Corp in 1998, according to data provided by Dealogic. The $82 billion megamerger created the world's biggest publicly traded energy company and came amid a flurry of consolidation among the world's giant integrated oil companies from which Shell remained aloof.

It remains to be seen if Shell's acquisition of BG signals the start of another round of blockbuster oil sector tie ups. Oil and gas companies on the Stoxx Europe 600 index jumped following the news, but Shell's shares are down, suggesting investors have yet to be convinced of the value of a new round of super deals.

The last big round of oil-and-gas mergers changed the face of the oil industry in the late 1990s and early 2000s, after another oil-price collapse. Exxon bought Mobil, BP merged with Amoco and ARCO and Chevron tied up with Texaco.

Write to Sarah Kent at sarah.kent@wsj.com

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