Conventional trap, such as four-way closure, faulted anticline and fault dependent 3 way closure are no longer exist or at least hard to be found lately in hydrocarbon exploration, and mostly they are small reserve. Nowadays exploration in many oil companies are entering to identify the unconventional traps such as stratigraphic traps, fractured basement, Coal Bed Methane (CBM), shale gas, etc. Therefore, changing exploration strategy is a must. Regional geology in South Sumatra Tertiary Basin is well understood as well as the petroleum system in general. Their paleo high, the distribution of the source rock and reservoir, and its clastics source are well known. One of proven stratigraphic traps in Medco area is Talangakar Fm in Ibul Field. Ibul Field, with recoverable reserves 25 MMBOE, first was found in 1971 and it such a field with combination of structural and stratigraphic trap. This finding has opened next opportunity to find another stratigraphic trap potential in surrounding areas. Core data from Ibul-2 suggests distributary channel sand facies as reservoir in Ibul Field. 2D seismic in Ibul Field also displayed anomaly features supporting the core analysis result. Unfortunately, this play hasn’t been applied to other Medco area for more than 20 years. Further, Kalidua-1 well which is located around 20 kms to the north of Ibul Field is tested oil. Similar anomaly features in 2D seismic like Ibul Field also was observed in Kalidua-1 well. Grabbing Ibul Field as analogue and applying the suitable geological concept, making this area become more attractive. In conclusion, applying field analogue and geological concept as exploration methods have succeeded to identify new potential area. However, a detailed study and more advanced data such as 3D seismic might reduce the geological risk.
Author : Febrie Ekaninggarani, Krypton Aprianto