Abstract

Recent studies in the Kampar Block, Central Sumatra suggest that a small Paleogene sub-graben between Lirik and Binio Fields (Binio Sub-Graben) is the likely source kitchen for the Binio, Pekan and the Lirik Trend Fields. This sub-graben is part of the larger Bengkalis Trough. Although no well has penetrated a lacustrine source rock in the Binio Sub-Graben, by inference from bio-marker analysis a prolific source rock is expected to be present within the sub-graben.

Basin modeling indicates that major oil generation in this sub-graben has occurred between ~10 - 8 MYBP (Million Years Before Present). At that time, the Binio and Lirik Trend structures did not yet exist. Consequently, any generated hydrocarbons would have filled paleo-structures nearby the present Binio and Lirik Trend Fields.

During the Plio-Pleistocene tectonics, inversion has caused spillage from paleo accumulations to present-day traps. To analyze the hydrocarbon migration and remigration pathways, we used a combination of mature kitchen, paleo structure and present-day structure maps. Past exploration efforts focused on the large and obvious structures, hence the remaining exploration potential lies within subtle folds that are located within migration and remigration pathways.