New Insights on Depositional Styles from the Samarang Field Using Stratal Geometries and 3D Seismic Facies Analysis with a Neural Network Approach

In the Samarang field, log data suggest that the reservoir quality is controlled by an interplay between the tectonics, sediment supply, and available accommodation space. Previous studies referred to a so-called ‘homogeneous’ thick sand package with little variability while the present study unravels significant vertical and lateral heterogeneity. The larger and finer scale progradational units and the amalgamated, massive sands identified from well logs have distinct correlation to seismic stratal geometry and 3D seismic facies as highlighted from this analysis. The stacking pattern of these units is observed at multi-scales and can be related to small- and large-scale cyclicity and variations in the depositional environment.