The location of Seram Island is located between the Banda Sea and the Seram Sea which is included in the Banda Arc. The Banda Arc itself is the result of the interaction of three large plates; Eurasian Plate, Indo-Australian Plate and Pacific Plate. According to Hill (2012), the stratigraphy on Seram Island can be divided into six groups: Bed Metamorphic Rocks, Triassic-Jurassic Sedimentary Rocks, Nief Complex, Salas Complex, Pliocene-Plistocene Sedimentary Rocks and Alluvium.Based on the Bouguer Anomaly Map and the results of filtering into residuals, it can be seen that the Bouguer anomaly values range from -45 mGal to 100 mGal. Relatively low anomaly values (blue to green/reflecting sedimentary basin areas) extend from southeast to west-northwest, extend in the direction of Seram Island and are flanked by relatively high anomaly zones (yellow to red-pink) in the south and north-northeast. In petroleum system the low anomaly area is the source rock zone and the relatively high anomaly part is the trap zone.The high anomaly zone is influenced by tectonics and large faults that work in this area, namely: the interaction of the collision system between the Australian plates, the Banda Sea and the Pacific Sea and also the influence of the movement of the Sorong Fault and the Tarera-Aiduna Fault. The relatively high anomaly zone in the north is the current subduction line between the Pacific oceanic plate and the Australian continental crust and the Banda Sea crust

Based on Kufpec exploration results on the East Nief – 1 well (1988), the oil found in the Manusela limestone layers has a low-medium API value (24.9o to 25.5o), high sulfur content (2.26 – 1.86 Wt%), medium aromatic . Oil with high sulfur character is similar to oil found in East Sulawesi and the Salawati Basin (Robinson, 1987).Oil samples from Oseil 9 pad 4, Oseil 11 pad 2, and Wellhead RN1 with a ratio of pristane/phytane <1 showed that the organic material in the oil came from marine algae type II, which was deposited under anoxic conditions (Peters and Moldowan, 1993). Based on the maceral type of sample 14 DA 28E, this rock was deposited in a Terrestrial environment. The following figures indicate that the three oils (Oseil 9 pad 4, Oseil 11 pad 2, and Wellhead RN1) originate from the same source.The formations that act as source rocks in the Seram Basin are the Kanikeh Formation and the Saman-saman Members of the Manusela Formation. Kanikeh Formation TOC 0.05-3.73%; Tmax 367-518oC (mature-overmature); Hydrogen Index (HI) between 7-15 (gas prone). Saman-saman members, TOC 0.08-0.92%; Tmax 443-554oC (mature-overmature); Hydrogen Index (HI) 72 (gas prone). Maceral analysis showed 1.2% detrovitrinite (densinite), 0.2% telo-inertinite (fusinite), 0.1% pyrite and 98.5% clay minerals used in maceral-type distribution triplots, producing gas (prone gas; kerogen type 3).The formation that acts as a reservoir rock is the Kanikeh Formation (sandstone) which has good porosity, over pressure makes it less permeable and reduces pores. Manusela Formation (limestone) has pores from rock cavities and fractures. The Wahai Formation (top; gravel-conglomerate sandstone) and the Fufa Formation (Conglomerate), act as nest rocks because they have quite good porosity and permeability.Based on the regional stratigraphy, the Wahai or Kola Formation and parts of the Kanikeh Formation are shale and are located above the Manusela Formation which are good caprocks.Traps in the basins on Seram Island are fault structures followed by folding patterns. This provides the possibility of trapping hydrocarbons in these structural forms, in addition to the presence of unconformity in the Mesozoic rock sequence. This type of trap applies to Mesozoic play. Traps in the Quaternary play system are stratigraphic, namely oil trapped in wedging out sandstones and limestones