Influence of highly permeable faults within a low-porosity and low-permeability reservoir on migration and storage of injected CO2

摘要: Faults in CO2 storage reservoirs affect the migration and spatial distribution of injected reservoir formations. Based on geological data from Ordos demonstration project site, A 2D numerical model was constructed to study influence high-porosity high-permeability faults within a low-porosity low-permeability reservoir. The results show that had significant effect storage. If permeability fault zone increased by 2–3 orders magnitude (a common range variation zone) porosity correspondingly compared base case (no strata), distance after 100 years approximately 1.18 times larger than without faults, total amount entire 1.40–1.61 times. weakened sealing ability local interlayer caprocks (mudstone), which resulted migrating through mudstone entering neighboring stratum. When highly permeable existed, stratum were two 19.41 (maximum value) higher, respectively, with fault. Therefore, distributed strata should be given sufficient attention when selecting sequestration site.