ABSTRACT

As it is pointed out in (IPCC 2005, p. 234) there are

some main questions to answer concerning CO

sto-

rage sites like: “What actually happens to CO

in the

subsurface and how do we know what is happening?

Can we verify that CO

is safely and effectively

stored underground?”. The answer to these and a lot

more questions can not only be given by models and

model-based calculations. So monitoring techniques

and a monitoring concept are needed for a wide va-

riety of purposes. Monitoring is needed to ensure

and document effective injection well controls, to

verify the quantity of injected and stored CO

, to op-

timize the efficiency of the storage project, to docu-

ment that CO

remains in the intended storage for-

mation, to detect leakage and to warn of any seepage

or leakage. So monitoring is important and neces-

sary for managing the storage activities themselves

but also for preventing the local environment. And

last but not least monitoring will help to increase

public acceptance. The importance of monitoring

and verification is also shown by the EC-funded re-

search project “CO2ReMoVe” (Wildenborg et al.