A Collective Proven Play of Paleogene Lacustrine Rift Basins in Western Indonesia

Abstract

Shallower reservoirs in Western Indonesia are essentially depleted where deeper target such as Paleogene synrift deposits are believed as auspicious solutions, despite of being exceptionally risky and still moderately understood in terms of their quality, extent and connectivity. These synrift rocks are viable and prolific as petroleum plays and the exploration of the reservoir within these lacustrine strata likely be a source of future reserve additions in Western Indonesia. Numerous studies regarding this issue have been conducted previously but the synchronization between them are never been addressed. This paper synthesizes latest studies by Sihombing et al., (2016, 2017, and 2018), which provides comprehensive and integrated studies in these mature and important basins in Western Indonesia: (1) Central Sumatra Basin, (2) North West Java Basin, and (3) West Natuna Basin, by using consistent methodology (sedimentology, biostratigraphy, tectonostratigrapy, seismic facies and attribute). Despite of being situated separately, these basins share similarity as half graben system but formed by different tectonic regime during Paleogene. We found that variations of each rift basin’s form and fill processes provide difference in paleogeography development, consequently reflect different basin drainage network which provides unique reservoir distribution within a lacustrine environment. In addition, we also recognize several lithofacies play types including: Alluvial Fan-Fan Delta, Lacustrine Delta, and Fluvial Delta with their reservoir characteristics, propectivities, risks and challenges which be essential as analogues in exploring this type of play.

AAPG Datapages/Search and Discovery Article #90350 © 2019 AAPG Annual Convention and Exhibition, San Antonio, Texas, May 19-22, 2019