CO2 capture and geological storage (CSS) is one alternative that offers a new
set of options for reducing greenhouse gas emissions. The concepts of CO2
storage refer to the injection of carbon dioxide in dense form into aquifers,
which basically must meet several conditions. Three types of geological
formations that usually can be used for the geological storage of CO2 are oil
and gas reservoirs, deep saline formations and unmineable coal beds. Indonesia
has about 60 Tertiary sedimentary basins, however that great precautions must
be taken for selecting particular sedimentary basin for carbon dioxide storage.
Preliminary risk assessment can be conducted on basinal scale based on
possibility of leakage and geothermal gradient. On basinal scale, sedimentary
basins in Indonesia are of intermediate to high risk for CO2 storage.
The increasing amount of greenhouse gas in the atmosphere recently has become
one of the discussed topics in relation with the world’s concern on climate
change. Strategies to respond the increasing emissions of carbon dioxide (CO2)
have been proposed. Carbon dioxide capture and storage (CSS) is considered as
one of the options of reducing atmospheric emissions of CO2. Storaging CO2 by
sequestresing it into geological formations is one alternative which has been
implented in some countries since a decade ago, varying from pilot scale to
large scale commercial application (see IPCC, 2005).
Indonesia has a chance to participate in this global action, since geologically
Indonesia is promosing to provide sites which are suitable for CO2 storage.
This paper is an outlook of the geological condition of sedimentary basins,
especially of Tertiary age, in Indonesia and short preliminary review on their
feasibility for carbon dioxide storage.
Selection of geological formations for co2 storage
The concepts of CO2 storage refer to the injection of carbon dioxide in dense
form into aquifers, into situations that either (1) trap the carbon dioxide
into flow systems for geological periods of time (hydrodynamic trapping) or (2)
convert the carbon dioxide to carbonate minerals and,thus, render it immobile
(mineral trapping) (Hitchon et al., 1999).