Introduction to Geological Sequestration - Introduction to Carbon Capture and Sequestration - page 364

Section 3
Selection of geological sites
In the previous section, we assumed that a site suitable for geological
carbon sequestration is simply a site with pore space into which CO 2
can be injected. The conditions we imposed were that it should be suf-
fi ciently deep that CO 2 will be supercritical and that the formations
should be below a caprock that prevents the CO 2 from escaping. In
Figure 8.3.1, a few different types of geological formations are shown
schematically [8.1]. They include depleted oil and gas reservoirs, oil
reservoirs undergoing enhanced oil recovery, deep saline water-satu-
rated reservoir rocks, and unminable coal seams. We discuss these
different types of formations below.
Figure 8.3.1 Options for geological storage
Picture from CO2CRC: http://www.co2crc.com.au/images/imagelibrary/stor_diag/
storageoptions.jpg. Copyright by CO2CRC, reproduced with permission.