In unrest comparable in scale to Chechnya and Colombia, a year of bloodletting has killed more than 1,000 in the oil-rich Niger Delta, leaving the world's No. 7 oil exporter, and people here, concerned for the future. Royal Dutch/Shell, Nigeria's largest oil operation, which produces half the 2.5 million barrels Nigeria exports daily, also is reeling. A confidential 93-page security report commissioned by Shell in December 2003 warns that mounting attacks by criminals and ethnic militants could force the oil giant to abandon its onshore operations in the delta by 2008.