Numerical Study of CO2 Geological Storage without CO2 Leakage Risk in a Saline Aquifer

Abstract

The purpose of this study is to create a pilot CO2　geological storage without leakage risk in a saline aquifer directly leads to CO2 ionization and mineralization with the formation water and rocks As soon as it was injected by means of dissolving the CO2 into groundwater produced from deep saline aquifer aiming at finding a storage avenue which is long-lasting stable and environmentally benign in relatively short time comparing with traditional CO2 supercritical fluid injection This study presented a pilot test in northwestern Taiwan the potential CO2 storage formation is the Y-sandstone formation which is located in Y-field one of the onshore gas fields in the Taishi Basin Over 1 000 m underneath the Y-sandstone the K-sandstone has high water saturation and suitable geological condition to produce formation water to supply the water needs for dissolved CO2 storage after energy use CMG-GEM compositional simulator was used in this study to simulate the long-term fate of CO2 the results showed that dissolved CO2 injection remove the buoyancy effect to the storage process preventing the leakage risk In this study the migration and the fate of the injected dissolved CO2 was studied the CO2 trapping mechanisms and long-term fate of CO2 was analyzed to make sure the enhanced safety A novel strategy was presented to offer a CO2 geological storage without leakage risk in a saline aquifer Security was ensured in this study compared with traditional injection method the geochemical reactions process was fastened consequently accelerating the mineralization speed hence CO2 was fixed in the reservoir by the safest trapping mechanisms in shorter time

Date of Award	2018 Aug 28
Original language	English
Supervisor	Bieng-Zih Hsieh (Supervisor)