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Indonesia, in its pursuit of environmental sustainability and commitment to reducing greenhouse gas emissions, faces a pressing need for effective Carbon Capture and Storage (CCS) solutions. This study focuses on the application of material balance principles to assess the feasibility of CCS in the Lembak Field, located within the South Sumatra Basin.

The region has numerous industrial sources of CO2, such as coal-fired power plants, oil refineries, natural gas processing facilities, and chemical plants. This research aims to contribute to Indonesia's goal of achieving net-zero emissions by leveraging the country's tremendous potential for carbon capture and storage.

Reservoir parameters play a crucial role in the success of CCS initiatives. The estimated parameters for Lembak Field reservoir that are composed of limestone Baturaja include porosity (15-35%), average permeability (2-892 mD), initial reservoir pressure (1949 psi), and initial gas in place (671 BCF). To ensure the viability of the trapping system, a comprehensive geomechanical analysis has been conducted, emphasizing the importance of an effective seal for injected CO2. Seal rock that developed in the field is marine shale Gumai which have fracture pressure around 3100 – 3250 psi and fracture gradient with range 1.71 – 1.74 gm/cc.

Sensitivity analyses have been performed to evaluate the impact of varying reservoir injection rates based on several fracture pressure on the amount of CO2 that can be stored. These analyses provide valuable insights into the dynamics of the CCS process in Lembak Field, allowing for informed decision-making in the design and implementation phases.

The findings of this study underscore the potential of Lembak Field as a viable site for CCS, considering its geologic characteristics and the careful consideration given to trapping mechanisms. As Indonesia strives towards carbon neutrality, the outcomes of this research contribute to the broader understanding of CCS in diverse geological settings, supporting the nation's efforts to combat climate change and foster sustainable development.