Vol. 20 No. 1 (2026): April

Cover image by Shiguo Wu on pages 43-55. The image illustrates the evaluation and simulation of CO₂ sequestration in deep saline aquifers. CO₂ is injected through a wellbore into subsurface reservoir units, where caprocks and mudstone interlayers control its migration, trapping behavior, and long-term storage security. Based on integrated geological, petrophysical, and thermodynamic analyses, different reservoir-caprock combinations are identified and compared. The reservoir-caprock combination with an upper mudstone interlayer provides better confinement of CO₂, lowers caprock stress and leakage risk, and thus enhances sequestration safety and long-term stability.