Publications

The Suban gas field is located in the north western Corridor Block Production Sharing Contract (PSC) Area which is operated by ConocoPhillips Indonesia Inc Ltd. The Suban reservoir covers an area of 96 km2 and contains a gas column in excess of 1000 meters of gas column. The reservoir is geologically complex and consists of Tertiary age limestone reef, sandstone and conglomerate overlying fractured pre-Tertiary basement. The Suban water injection study focused on constructing a mechanistic sector model to evaluate the injection of produced water into the basement reservoir and predict the water disposal response and impact on offset producers. This study used a mechanistic approach with explicitly gridded fractures to model the impact of water injection into the Suban fracture basement. The model focused on the area containing the Well-A5, Well-A7 and Well-A8 wells that were candidates for a field injection trial. These wells we are previously used as a pressure observation wells on the flank of the field and are +/- 2-4 km from the closest producing wells in the reservoir section. Fractured basement reservoirs have a high degree of heterogeneity and complex geological characteristics. They have always faced major challenges and risk in both the exploration and production phases. A wide range of reservoir and fracture descriptions were used to evaluate the impact of injection into the Suban fracture basement.