Lorenzo Perozzi edited Becancour like1.tex  over 9 years ago

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\subsubsection{Bécancour-like scenario}  Figure \ref{fig:fig8} shows the corridor stack for 7 offsets. For each corridor stack, black traces refer to the baseline survey and red traces refer to CO$_2$ injected scenario. A travel-time delay due to the CO$_2$ injection is well detected starting at 500 ms. The effect of CO$_2$ is mainly observed by a travel-time delay. Other authors reported similar obervations \citep{Yang2014,Arts2004}. We can also notice an AVO anomaly with an amplitude increase with the offset at the basement reflector. Since the saturation and the CO$_2$ plume shape do not evolve too much in the time-lapse modeling, we do not have significant variation between repeated monitoring.\\  Figure \ref{fig:fig11} shows the comparaison of the seismograms obtained from a stochastic geological model (left) versus a blocky model (right) for a 5 years time-lapse. As expected, the lack of detail in the blocky model is reflected in the seismograms. For exemple, the time-delay at 500 ms, ms  is not observable in the blocky seismograms.