ADN by Lisa Demer.  "Today marks the culmination of Shell’s six-yearPete Slaby, Shell, Chukchi, Photo by Dave Harbour, Alaska OCS effort to explore for potentially significant oil and gas reserves, which are believed to lie under Alaska’s Outer Continental Shelf," the company said in a statement.   …   "Happy, happy, happy," said Pete Slaiby (NGP Photo), Shell’s vice president for Alaska. He gave a series of interviews Saturday to reporters from around the country following Shell’s difficulties and progress.  "This is such a big deal," he said. "It is opening up potentially a new chapter in Alaska’s oil and gas story."