Publications

Reservoir quality in carbonate systems is notoriously difficult to predict due to the susceptibility of carbonate rocks to undergo diagenetic changes soon after deposition. In the Corridor PSC, the Miocene Batu Raja Formation (BRF) carbonates of South Sumatra, enhanced secondary porosity has been associated with rapid sea level fluctuations during the Miocene. Observed variations in the spatial distribution of reservoir quality suggest that secondary porosity development in the BRF is likely controlled by the original distribution of facies related primary porosity. Well log, core and mud log data were integrated with seismic interpretation to develop a regional depositional facies map. Our preliminary results show a positive correlation between interpreted depositional facies and calculated average porosity values, suggesting that detailed depositional facies maps could be used to guide porosity prediction. The findings are being used to help mature COPI’s leads, identify new opportunities and to better understand reservoir quality variations on a field scale.