The program described in the Oil Research Program Implementation Plan is a self-contained core research program whose goal is to maximize the economic producibility of the domestic oil resource. This plan was developed in support of the Hydrocarbon Geoscience Research Strategy, and in parallel with the Natural Gas Program Implementation Plan. While the objective, strategy, and management tactics of the program are described in some detail this Implementation Plan is not complete. It is based on the best analysis that is now available and will be revised as new analysis directs. Certain aspects are recognized to be preliminary in nature, such as the work in heavy oil, where the basic analysis required to identify the urgent issues affecting this resource is just now being initiated. Only about 40% of the known US resource has undergone the detailed assessment, classification, and analysis which is required for program planning. Classification and analysis of the full US oil resource is expected to be complete by October 1992. Work may be proposed in at least some of the priority classes as soon as they are identified, but before all of the classification work has been completed. Finally, the field RD D activities and supporting RD D projects are purposely nonspecific in this plan, because they must be detailed in response to the problems that will be identified as work begins with the states and industry on specific reservoir classes. The FY 1991 budget requests funds to begin work on the first two high priority reservoir classes to be identified as a result of the current National reservoir classification effort. This Implementation Plan will be revised annually, and the currently underspecified elements will become substantially more explicit as the takes shape. 43 figs., 20 tabs.