Royal Dutch Shell Plc and Devon Energy Corp. may join Exxon Mobil Corp. as buyers of U.S. shale- gas producers or projects, the chief executive officer of gas developer Range Resources Corp. said.

Range Resources CEO John Pinkerton said in an interview yesterday his company may be a partner or target for oil companies, like Apache Corp. and Occidental Petroleum Corp., seeking to expand shale holdings in North America.

Exxon said last month it would buy XTO Energy Inc., a Fort Worth, Texas-based gas producer, for about $37 billion in stock and debt. Petroleum companies are “clearly sniffing around,” said Pinkerton, who declined to identify companies that have approached him.

Oil companies, previously focused overseas, are now “seeing that natural gas is half the carbon footprint of coal, it’s a third cleaner than oil, and now you’ve got these gigantic shale plays in the U.S.,” said Pinkerton.

Natural gas produces less carbon dioxide, the heat-trapping gas blamed for accelerating global warming, than crude oil or coal, according to the U.S. Environmental Protection Agency. Shale gas is produced from rock formations using water, sand and chemicals.

Range Resources, based in Fort Worth, Texas, holds 1.4 million acres of leases for the Marcellus Shale, a formation that may hold 20 years’ worth of U.S. gas supplies. Improvements in shale-gas extraction technologies have helped U.S. gas reserves reach a record 1,836 trillion cubic feet, according to the Potential Gas Committee.

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