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\subsection{Modeling results}  In this section we present the results of three synthetic seismograms based on the stochastic geological model. Corridor stacked traces for 4 offset are shown for each seismograms. The results for the "baseline", the difference between baseline and CO$_2$ injected in the Cairnside layer and between baseline and CO$_2$ in the Covey Hill layers are shown on Fig \ref{fig 7}. \ref{fig:fig7}.  As demonstrated in Fig \ref{fig 7}b \ref{fig:fig7}b  and \ref{fig 7}c \ref{fig:fig7}c  the difference after CO$_2$ injection are caused primarely by the slight shifts between the two images. The shift starts at 0.85 s for the model with CO$_2$ on the Cairnside layer and about 0.1 s later for the model with CO$_2$ in the Covey Hill layer. In the model with CO$_2$ in Cairnside layers (red in Fig 8b), \ref{fig:fig7}b),  we see a strong increase in the reflection strenght from the Covey Hill formation. \\ The effect of CO$_2$ is mainly observed by a travel-time delay. Other authors reported similar obervations \citep{Yang2014,Arts2004}