Improving Performance in A Mature Field: Integrated Analysis For Identification and Optimization of Low-Resistivity Hydrocarbon- Bearing Sand Reservoirs in Semberah Field, Mahakam Delta

Low resistivity pay zones still leaving significant reserves in Semberah and currently contribute to Semberah production. Combination factor of bed thickness, grain size, conductive mineral, and clay mineral are dominant reason to lower the resistivity in Semberah. However, structural dip becomes less affected to low resistivity because of low angle structural dip in Semberah. In particular, Clean sand with low resistivity most likely affected by conductive minerals, while shaly sand controlled by presence of clay minerals. Numerous potential zones has been discovered from F to I interval. The main candidates coming from G and I interval with depth in between 6000 – 9000 ft in average. Integrated approach to low resistivity pay zone becomes important to overcome declining trend in production, and also to optimise bypassed zone in Semberah.