Estimated Oil and Gas Reserves, Gulf of Mexico, December 31, 1998

Remaining proved reserves in the Gulf of Mexico Outer Continental Shelf (OCS) as of December 31, 1998, have been estimated to be 3.36 billion barrels of oil and 30.0 trillion cubic feet of gas. These reserves are recoverable from 790 proved active fields. Unproved reserves as of December 31, 1998, have been estimated to be 1.00 billion barrels of oil and 5.1 trillion cubic feet of gas. These reserves are associated with 58 unproved active fields. There are 3 unproved active fields not studied. In total there are 851 active fields located in Federal waters. Proved reserves are estimated to have been 14.27 billion barrels of oil and 162.7 trillion cubic feet of gas from 984 proved fields in the same geographic area. Included in this number are 194 proved fields; not included are the 61 unproved active fields. Estimates were derived for individual reservoirs from geologic mapping and reserve evaluation. The unproved reserves, associated with the 58 unproved active fields, are not added to proved reserves because of different levels of economic certainty and hydrocarbon assurance. For any field contained partly in State waters and partly in Federal waters, reserves are estimated for the Federal portion only.