Table 13.

Effective CO₂ storage capacity in the Obaiyed Field, governed by pressure management rather than pore volume alone.

Reservoir member	Scale	ΔPmax (MPa)	Pressure-limited capacity (MtCO2)	Capacity limitation
Lower Safa	Single compartment	2 MPa	0.0006–0.0010	Strongly injectivity-limited
Lower Safa	Single compartment	5 MPa	0.0015–0.0024	Injectivity-limited
Lower Safa	Single compartment	10 MPa	0.0030–0.0045	Near volumetric limit
Lower Safa	Multi-compartment (aggregated)	2 MPa	0.002–0.004	Pressure-managed
Lower Safa	Multi-compartment (aggregated)	5 MPa	0.006–0.012	Balanced
Lower Safa	Multi-compartment (aggregated)	10 MPa	0.012–0.020	Volumetric-controlled
Upper Safa	Single interval	2–5 MPa	< 0.0001	Volumetrically limited

*Pressure-limited capacities represent conceptual estimates derived from assumed pressure constraints and are intended for comparative screening rather than operational design.