Shell Canada Files Formal Offer for Duvernay's Shares

Shell Canada Limited, a wholly owned subsidiary of Royal Dutch Shell plc, has filed its formal offer to acquire all the common shares of Duvernay Oil Corp.  with securities regulators in Canada, and has mailed its offering circular and related documents to Duvernay shareholders.

The Offer remains open until 1:01 a.m. (Calgary time) on August 22, 2008, unless the Offer is withdrawn or extended by Shell Canada Limited. Under the terms of the Offer, Duvernay shareholders will receive C$83.00 for each Duvernay common share.