Publications

Recent 2D PSDM Interpretation in Offshore Matindok Block has given a better understanding about the architecture of Banggai-Sula foreland basin including the geometry and boundary of each wedge-top, foredeep, forebulge and back-bulge area. During 2014-2016, play evaluation mainly focused on wedge-top, fore-deep and fore-bulge areas due to abundant seismic lines and exploration well data in these areas. The result showed regional depth map of Miocene carbonate was able to define several plays related to imbricate thrust, build-up and pop-up structure. In this paper, we mainly focus on unexplored backbulge area in order to deliver potential petroleum plays using 2D regional seismic data sets with top formation and age marker data from Tiaka Field which is 60 km west of study area. Based on seismic interpretation, there are two recognized potential plays in the back bulge area: 1) Miocene build-up carbonate clusters, sealed by Plio-Pleistocene Celebes Mollase consisting of conglomerate, conglomeratic sandstone, shale and charged during early Pliocene related to collision tectonic from possible Jurassic shale of Buya Formation which is deposited in Mesozoic graben system. The highest risk for this play isMesozoic thermogenic source rock existence. 2) Pliocene Sandstone in deep water channel system, sealed by Plio-Pleistocene shale of Celebes Mollase and charged during early Pliocene related to collisional tectonic from possible Miocene to Pliocene marine clastic biogenic source rock. The highest risk for this play is Pliocene biogenic source rock existence. Despite there being no exploration well in this area we believe that both potential plays can revive exploration activities. Further study about thermogenic and biogenic generation, timing of migration, lateral seal effectives of each channel and possibility to acquire new 3D seismic data set in offshore area are needed to give better understanding of these potential plays.