Shell Oil en Oil Sheen in Gulf Breaking Apart <p>The Shell oil company says an oil sheen it reported in the Gulf of Mexico is breaking up.&nbsp;Federal officials will continue searching for the source.</p><p> Fri, 13 Apr 2012 11:00:00 +0000 Eileen Fleming 8689 at Shell report of Gulf oil slick <p>HOUSTON (AP) &mdash; Shell Oil reports that it has mobilized an<br />oil spill response vessel after a light, 10-square-mile oil slick<br />was spotted between two of its major production sites in the<br />Gulf of Mexico. The light sheen was spotted about 130 miles<br />southeast of New Orleans.</p> Thu, 12 Apr 2012 16:36:14 +0000 The Associated Press 8686 at