Mesoscale Assessment of CO₂ Storage Potential and Geological Suitability for Target Area Selection in the Sichuan Basin

Table 12

Geological suitability assessment information of the main reservoir distribution area (within section four of Xujiahe formation).

Level one index	Level two index	Level three index	Distribution information of the main reservoir in Xujiahe section 4	Geological information outside of Xujiahe section 4 distribution
Reservoir conditions and storage potential	Reservoir geological characteristics	Lithology	Clastic	Mix of clastic and carbonate
		Thickness/m	≥80	<30
		Sedimentary facies	River, delta	Beach bar, reef
		Average porosity/%	GIS partition processing	<10
		Average permeability/mD	<10	<10
	Storage potential	Storage potential per unit area (10^4 t/km^2)	GIS partition processing	GIS partition processing
Geological safety	Cap geological characteristics	Lithology	Argillite	Argillite
		Thickness/m	≥100	≥100
		Main cap depth	1000–2700	1000–2700
		Buffer cap above main cap	Multiple sets	Multiple sets
	Hydrodynamic conditions	Hydrodynamic conditions	GIS partition processing	GIS partition processing
	Seismic activity	Peak ground acceleration	GIS partition processing	GIS partition processing
		Fracture development	GIS partition processing	GIS partition processing

The main reservoir is the section four of Xujiahe formation, and the main cap is the lower Jurassic strata. The GIS partition processing must be carried out separately for the prospective areas within and outside of section four of Xujiahe formation. The geological information outside of section four of Xujiahe formation is from the best value of other eight reservoirs.