<![CDATA[East Java region, as one of the most industrialized regions in Indonesia, is a significant contributor to national greenhouse gas (GHG) emissions, and therefore may play a significant role in supporting the national commitment to reach net zero emissions (NZE). This study is made to provide an example of how a conceptual CCS scheme using a saline aquifer is applied in the region. Tanjung Awar-awar coal-fired power plant, which is located in the Tuban city area on the northern coast of East Java, is selected as the GHG source. With its power generation capacity of 2 x 350 MW, it emits 4.5 Mt CO2e annually. The extensively distributed Kujung carbonate formation is chosen as the CO2 saline aquifer storage. Amidst the typical data rarity commonly faced in preliminary studies on saline aquifers, modeling for CO2 storage has been performed using all available primary and secondary data from all available sources. The most likely estimate of storage resource shows 479 Mt CO2e (status: 3U in SRMS classification system), with its A2 block possessing 162.78 MtCO2 storage resource. The CO2 injection scheme is essentially a volumetric balancing between CO2 emissions and injection rates through injection wells. Well injection capacities are estimated, and must be able to cope with CO2 emissions from the power plant. Accordingly, two CCS scenarios of 50% CO2 capture (Scenario A; 4,671 tons/day) and 100% CO2 capture (Scenario B; 9,342 tons/day) are set. To serve the two scenarios, four (4) and eight (8) horizontal wells are needed, respectively. A similar approach has also been made for vertical injection wells. Following the assumptions set in the CCS scheme, a total of 34,098,300 tons and 68,189,300 tons of CO2 can be stored in a 20-year injection permit for Scenario A and Scenario B, respectively. Nonetheless, these figures constitute just fairly small fractions of the Kujung A2 block’s storage resource. This shows the huge potential of the Kujung Formation to act as a saline aquifer storage for CCS schemes in the East Java region. This also presents the potential of the Kujung Formation to sustain multi-CO2 sources and prolonged injection schemes. Despite many challenges faced, especially in relation to data scarcity, the results may serve as a reference for more detailed project-based studies in the future.]]>
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