Source to Sink in the Middle Miocene to Recent Succession of NW Borneo

Since the launch of the Science and Technology for Exploration and Production Solutions (STEPS) outreach program by Landmark at LIFE 2016, a series of Distinguished Lectures have taken place around the world, which have all followed the theme of source-to-sink analysis.
These lectures have been delivered by leading geoscience experts, including John Snedden (University of Texas, Austin), Dr. Ole Jacob Martinsen (Statoil) and Prof. Mike Stephenson (British Geological Survey). Through these lectures and other STEPS initiatives, Landmark aims to bring the academic and wider E&P community together so they might collaborate and collectively help drive our knowledge and understanding forward towards future exploration success.
The fourth lecture will take place on 22nd March in Kuala Lumpur as part of KLEX (KL Explorationists) meeting and will be given by Prof. Joseph Lambiase, Director of the Petroleum Geoscience Program at Chulalongkorn University in Bangkok. His talk is titled “Source to Sink in the Middle Miocene to Recent Succession of NW Borneo”.
Abstract: Source to sink analyses often focus on sediment supply pathways to the deep sea from an adjacent hinterland with far less emphasis on the intervening shallow marine environments that temporarily store sediment during its journey offshore. However, these shallow marine environments cannot be overlooked in NW Borneo because they were the sediment sink for a vast majority of the sediments in the up to 14 km thick middle Miocene and younger succession. Rapidly subsiding synclines, growth faults, inversion anticlines and shale ridges trapped sediment within several structurally-active sub-basins that were dominated by shallow marine environments. The evolving, structurally-generated topography changed the shoreline morphology frequently thereby segregating the shallow marine strata into thick, wave-dominant and tide-dominant successions and caused a quasi-independent stratigraphic succession to develop within each sub-basin. Several lines of evidence indicate that the sands with the best reservoir properties were deposited on wave-dominant, non-deltaic shorelines during transgressive events.

The evolving topography also continually modified the number and location of rivers reaching the palaeo-shoreline, resulting in a spatially and temporally variable sediment supply to the multiple modest-sized rivers, of which the present-day Padas and Limbang appear to be the largest shelf edge. Seismic stratigraphic and fluvial outcrop observations indicate that there were, longest-lived and most important with respect to sediment supply. The mineralogy and texture of the sand delivered by these rivers was diverse owing to contrasting bedrock lithologies in the different catchment areas; reservoir quality of the resulting deepwater sands is comparably diverse. Because of the multiple sources and frequently-changing sediment supply, the spatial and temporal distribution of deepwater sand accumulations are less related to sea level fluctuations than those sourced from a single shelf edge delta and also are smaller in size with a more scattered geographic and stratigraphic distribution. The complex sediment supply pathways and variable provenance appears to explain some of the stratigraphic and areal variability that occurs in the reservoirs of deepwater fields that are in close geographic proximity.
This Distinguished Lecture will be hosted at the Corus Hotel, KLCC, in Kuala Lumpur on Wednesday 22nd March at 6.30pm local time (doors opening at 5.45pm). Visit iEnergy® in the University Hub for news on how to hear the live broadcast or its subsequent recording.
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