deletions | additions       diff --git a/introduction.tex b/introduction.tex  index 5ef646a..2ec26e2 100644  --- a/introduction.tex  +++ b/introduction.tex 
...
The Cambrian-Ordovician sedimentary basin of the St. Lawrence Platform in southern Quebec has been identified  as the most prospective basin in the province of Quebec for CO$_2$ storage \citep{Malo2012}. The Becancour   region is located on the south shore of the St. Lawrence River, midway between Montr\'eal and Quebec City (  Fig.~\ref{fig1}). Fig. \ref{fig:fig1}).  The B\'e\-can\-cour region deep saline aquifers were selected as a potential target for injection of CO$_2$ in a future pilot project, based on seismic reflection and well log data available from gas exploration and the proximity of an industrial zone emitting up to 1 Mt of CO$_2$ per year. The success of the geological sequestration depends on the capability   to monitor movements of the injected gas into the subsurface.   Seismic methods were shown to be efficient for MMV due to their high