Outcrop Analogues for Subsurface Sand Body Geometries in Regressive and Transgressive Mahakam Delta Successions

Detailed sedimentologic, stratigraphic, and biostratigraphic analysis indicates that both regressive and transgressive deltaic successions comprise the continuous, nearly 400 m thick middle Miocene Balikpapan Formation succession that is exposed in the Grand Taman Sari Circuit outcrop. There are two major lithofacies associations: 1) a 115 m thick, fluvial-dominant regressive succession, and 2) an overlying 280 m thick transgressive shallow marine succession that becomes increasingly marine upward. The shallow marine succession is tide-dominant and aggradational, the regressive succession, fluvial channel sandstones m splay sandstones m sands of fluvial channel