oa Predicting CO2 Distribution with Petroleum System Modeling in a Mature Basin: a Case Study from Western Luconia Province, Sarawak, Malaysia

Western Luconia, offshore Sarawak is a known gassy area with perceive high CO2 based on discoveries in the area, and this has curbed exploration enthusiasm in the area. To counter the perspective of high risk in exploring this area, a petroleum system modeling was done to ascertain CO2 origin and distribution, with possible hydrocarbon accumulations. This paper aims to investigate whether recent drilled wells, post study, in Western Luconia, match the CO2 trend established in the 2021 basin model. The methodology used in the model includes conducting the possible CO2 origin evaluation, CO2 isotope and fluid PVT (Pressure Volume Temperature) analysis, thermal maturity and CO2 kinetics evaluation, CO2 history matching with existing wells, establishing CO2 maps for different geological cycles, and comparing the recent drilled well results with the established model. This CO2 distribution map has shown to be a powerful tool for predicting CO2 concentration and commerciality. Team can rank their prospect better in this high uncertainty of CO2 content area. Our stakeholder / exploration team will benefit from the CO2 prediction map which helps their decision making from better understanding of the risk and uncertainty involved in the areas.