Royal Dutch Shell PLC (RDSB.LN) and ExxonMobil Corp. (XOM) are offering a stake in a North Sea oil prospect to a partner willing to pay for an exploration well, said documents posted on the Indigopool Web site.

The size of the stake offered and the cost of the well weren't specified.

The blocks 22/21 and 22/26a in the Greater Hermione area have yet to be drilled and contain an estimated 220 million barrels of oil equivalent of light oil or gas condensate, said the companies. They are close to the Gannet platform and a rig slot has been secured for the third quarter of 2010, they said. Shell will operate the well and first production is planned for 2014-2016.

The companies opened a data room on May 26 and offers are due by July 13.

Indigopool advises oil companies on asset sales and purchases and bids for oil exploration licenses. It is owned by oil services giant Schlumberger Ltd. (SLB).

Company Web site: http://www.indigopool.com

-By James Herron, Dow Jones Newswires; +44 (0)20 7842 9317; james.herron@dowjones.com