Guangdong is the most economically developed
province in China, which is a large CO2 emitter and
hence is faced with severe carbon reduction pressures. In
this paper, a cost assessment methodology based on scenario
analysis is presented. A CO2 source and sink database
was built at Guangdong after detailed investigations on the
point sources and sedimentary basins. Fifteen transport and
five storage scenarios were defined and studied, respectively.
Cost estimates based on these scenarios show that
during its lifetime, the costs of both transport and storage
depend on the amount of CO2 processed. More CO2 being
processed will bring down the unit costs of both transport
and storage. However, it was observed that there is a cost
inflection point between the storage amount of 35.2 and
52.8 Mt/year, which means that as the storage amount
increases, the storage cost will first decrease and then
increase. Source region S1 in Guangdong has been recommended
for an early chance of CO2 storage. Preliminary
cost comparisons have shown that the results presented in
this study are reasonable, but to improve the cost assessment
accuracy of offshore CO2 storage, a methodology
based on a CO2 storage design that can integrate local
prices needs to be further developed.

Bai et al., 2013.pdf