Publications

Pleistocene-Recent river drainage systems and slope morphology in the North Kutei Basin were characterized by sediment-starved conditions with minor coast-parallel eastward-directed sediment influx. In contrast, drilling results from Angklung-1 and Tutung wells in updip coastal areas indicated an active channelized feeder depositional system with a NNW-SSE trend during the Late Miocene- Pliocene. Similar depositional trends are also observed from slope canyon morphology based on 3D seismic stratal-slices in the offshore area. These data imply an active sediment source during Late Miocene-Pliocene period into the North Kutei Basin probably derived from the Beriun Massifs located approximately 100 km in NW direction from Tutung area. Reconstruction of morphologically linked segments from source-to-sink allows the evolution of sediment-source catchment areas to be modeled for predicting sediment yield in downdip areas. The North Kutei Basin sediment-source catchment area was a small but active system controlled by rugged karst terrain paleotopography with highly erosive and efficient paleo-drainage system that shed high sediment influx into deepwater areas during Late Miocene-Pliocene times. However, continuous tectonic uplift during Pleistocene-Recent times renewed terrain relief, deflected drainage system around structurally-controlled topography, and led to sediment storage in entrenched fluvial fairways in the catchment areas segment. This is reflected by present-day more passive and mud-rich slope areas. Understanding the dynamic nature of drainage area segment boundaries is crucial for predicting * Salamander Energy Indonesia sediment deliverability in down-dip areas through time. This has been particularly important in the North Kutei Basin to explain the observed high sedimentation rates and channelized depositional systems in the Late Miocene-Pliocene slope area, that are contrary to the present day catchment areas and sediment supply.