Study and Application of Safety Risk Evaluation Model for CO₂ Geological Storage Based on Uncertainty Measure Theory

Table 1

Classification criteria of the qualitative indexes.

Grade	Value	Factors
		The cover layer lithology	Seismic safety	Presence of drilling and abandoned wells within 25 km^2 of the site	Topography	Main wind directions between the CO2 perfusion site and residents
High	3	Shale and compact limestone	Low	Many and not sealed	Lying and complex terrain	Upwind
Medium	2	Mud rocks	Medium	Exist and have been sealed	Broad and shallow terrain	Side wind
Low	1	Evaporating rocks	High	No	High convex open terrain	Downwind