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The eastern offshore area of Seram Island is expected to have a considerable hydrocarbon resource potential considering that the eastern section of the mentioned area has been proven to produce oil. To find out its potential, an evaluation of the hydrocarbon resources in this area was carried out. The objective of this evaluation was to calculate the hypothetical resources. Evaluation was conducted through several stages, including regional geology analysis, petroleum system analysis, subsurface structure mapping, lead inventory, and volumetric calculation. The data used in this evaluation include seismic sections, well logs, well reports, and field survey data with laboratory analysis data of outcrop samples. Based on the petroleum system analysis, the petroleum system elements are located within Triassic to Pleistocene sedimentary succession. Source rock is organic rich calcareous marine sediment with Ro 0.78–0.93%. Based on basin modeling analysis, the Triassic to Jurassic source rock began to mature and formed hydrocarbon at 34 Ma, while hydrocarbon migration started at 1.2 Ma. The main reservoirs are Jurassic carbonates of the Manusella Formation and Pleistocene sandstones of the Fufa-Wahai Formation, while the secondary reservoir is Pliocene Carbonate of the Upper Nief Formation. Based on seismic mapping, four leads can be identified in the eastern offshore area of Seram Island: Lead A, B, C and D. Volumetric calculations on all leads produce Oil in Place around 1219 MMBO with recoverable resources around 305 MMBO. Based on composite common risk segment mapping, prospective leads are Leads A, B and D.