Mystery Sheen , West Delta 80, LA

On 09MAR13, USCG MSU Morgan City contacted NOAA SSC in regards to a mystery sheen reported in West Delta Block 80, 21 miles southeast of Grande Isle. The sheen is reported as 5 miles by 5 miles with 70% dark blue/brown and 30% light rainbow. USCG has requested a trajectory from NOAA.