Perpustakaan Digital ITB

This study addresses the increasing CO2 in Indonesia, which are projected to peak in 2040 without mitigation measures. However, Indonesia has taken action to tackle this issue, including ratifying the Paris Agreement under the United Nations Framework Convention on Climate Change in 2016. Additionally, Indonesia has issued Peraturan Menteri Energi dan Sumber Daya Mineral Republik Indonesia Nomor 2 Tahun 2023 regarding the implementation of Carbon Capture and Storage (CCS) and Carbon Capture, Utilization, and Storage in upstream oil and gas activities, which has made the CO2 business more attractive in Indonesia. CCS, combined with the presence of numerous brown fields and favorable geological conditions, offers a significant opportunity to reduce CO2 emissions. Therefore, this study aims to determine the best way to select well locations for conversion into CO2 injection well in mature fields with existing production wells, providing guidance for readers in the selection of CO2 injection wells. The study utilizes a literature study approach, analyzing CO2 trapping mechanisms (structural trapping, residual trapping, and solubility trapping), as well as CO2 plume migration and influencing factors. The analysis in then applied in the “S” Field reservoir model located in East Java, Indonesia. Important parameters, namely porosity, horizontal permeability, and permeability anisotropy, are identified from the literature as crucial in CO2 sequestration within the formation. The analysis process involves three 2D maps: porosity, horizontal permeability, and permeability anisotropy. Well locations meeting the criteria for each map are selected, followed by an analysis of the trapping volume for the chosen cases and CO2 plume migration. The study yields two main results. Firstly, a procedure for selecting CO2 injection well locations is established, starting with the selection of wells with the highest permeability anisotropy, followed by horizontal permeability, and concluding with the highest porosity values. Applying this procedure to the “S” Field case, the optimal wells for CO2 injection for CCS are determined to be SKW-09ST and SKW-17ST, which exhibit the highest values of CO2 storage through residual and solubility trapping. Key findings from this study confirm the significant role of permeability anisotropy in CO2 plume migration, where horizontal migration enhances residual and solubility trapping. Neglecting the value of permeability anisotropy while focusing solely on horizontal permeability may limit the effectiveness of CO2 storage through residual and solubility trapping. High porosity in selected locations significantly contributes to residual trapping by providing more space for CO2 entrapment. Furthermore, a novel insight emerges regarding the selection of injection well locations, emphasizing the importance of maintaining sufficient distance between injection wells to prevent concentrated CO2 plumes.