Mawahdah, Nur Khairuni (2025) Studi Efektivitas Mineral Trapping Pada Co2 Storage di Saline Aquifer. Other thesis, Universitas Islam Riau.

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Abstract

Global warming occurs due to increasing concentrations of CO2 in the atmosphere resulting from the burning of carbon-based fuels, necessitating climate change mitigation through CO2 storage in geological formations. Saline aquifers are one type of geological formation with large storage capacity, making them suitable for storing large amounts of CO2. CO2 injected into saline aquifers will be permanently trapped through mineral precipitation, although this process takes a long time to fully mineralise. Therefore, this study will focus on analysing the mineral precipitation time to determine the time required for minerals to precipitate. Additionally, it will analyse the parameters most influencing mineral precipitation, including pH, pressure, temperature, porosity, permeability and rate inejction. This research was conducted using the Computer Modelling Group (CMG) software with the GEM simulator. The reservoir characteristics used are those of a homogeneous sandstone reservoir with a simulation model spanning 500 years for monitoring mineral precipitation. Geochemical reaction modelling was conducted, yielding results indicating that mineral dissolution processes occur, influencing ion availability for mineral precipitation in three primary minerals: calcite, dolomite, and illite. These processes exhibit a linear decline pattern from the start of injection until the completion of monitoring. The availability of ions from mineral dissolution supports mineral precipitation, namely k-feldspar in 2030, quartz in 2078, and kaolinite in 2294. The time differences for each mineral are influenced by several parameters, so a parameter sensitivity analysis was conducted using CMOST AI. The study also revealed that pressure is the dominant parameter with a main effect of 59%, followed by pH at 10%, temperature at 7%, rate injection at 1.28%, permeability at 0.29%, and porosity at 0.28%.

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