4.4 Injection site assumptions

An APEC study by Newlands and Langford, "CO2 Storage Prospectivity of Selected Sedimentary Basins in the Region of China and South-East Asia" [60], identified potential CO2 storage basins/formations in selected member economies of the APEC region. This section refers to the APEC study as well as other literature and bases its analyses on eleven basins (twenty formations) as potential CO2 storage sinks.

The quantitative representative analyses presented elsewhere in this report rely solely on indicative data on the reservoir properties of sedimentary basins in South-East Asia. These are based on geological assessments, seismic surveys and well drilling for oil and gas exploration and production. This generalised basin data is not sufficiently detailed to allow us to distinguish between specific types of storage reservoir into which CO2 might be injected. We assume in this report that all storage reservoirs are saline formations.

All the quantitative representative analyses in this report assume CO2 injection into a subsurface reservoir with a given set of reservoir properties. They assume supercritical or subcritical CO2 injection depending on the pressure regime of the transport and injection operation. The analyses implicitly assume injection sites with the reservoir properties assumed for the sedimentary basin where they are located.

Individual depleted or producing oil and gas fields are unlikely to have the same pressure regime as we assume applies to the sedimentary basin and we do not attempt to analyse depleted or producing fields in our representative cases.

Table 3 shows the potential CO2 storage sinks selected for analysis.

The reservoir properties of the storage formations are given in Appendix 3. In some cases there is very little data on the potential storage sites. Therefore we make simplifying assumptions and estimates for the illustrative analyses.