GOCAD StreamLab Revisited for Hydrogeology Applications

@inproceedings{Mathieu2008,
 abstract = { Last year, a streamline simulator, referred as to StreamLab, was developed to solve large
multicompositional fluid flow models involved in gas & oil 3D reservoirs (Oladyshkin et al., 2007, 2008).
This gOcad plugin solves the pressure and velocity mass balance equations using a finite volume flow
numerical approach on each control cell volume of the studied domain given some oil reservoir boundary
conditions. The hydrodynamic and thermodynamic parts are solved by a multi-component 1D solver
along each streamline which are derived from the velocity field. This petroleum oriented flow simulator
takes into account only two types of boundary conditions, namely the impermeable ones (no-flux
condition) and the infinite analytical aquifer one. It is of limited use in classical hydrological problems.
This work aims at adapting the gOcad StreamLab plugin to hydrogeology issues. In a first step, the
multicompositional part is simplified to introduce new boundary conditions such as imposed pressures,
or/and imposed flow rates (Neuman and Dirichlet), and free unsaturated boundary layer, frequently
encountered in hydrogeological studies. These conditions have been tested for well rate or pressure
conditions, but the algorithm can not be extended directly at the domain limits. In order to be as flexible,
easy to use and model independent as possible, boundary conditions are attached to Surfaces instead of
Grid objects. The field pressure is computed by solving the mass balance equations. It is updated at every
time step when it is necessary to account for time dependent boundary conditions.
In a second part, the mass balance equations and the boundary conditions are modified to compute
the pressure field for a non-captive aquifer accounting for recharge flows and faults influence. This part is
still in progress.
These StreamLab plugin extensions extend gOcad capabilities to several applications encountered in
hydrogeological and environmental issues. },
 author = { Mathieu, Jean-Baptiste AND Collon, Pauline AND Caumon, Guillaume AND Royer, Jean-Jacques },
 booktitle = { Proc. 28th Gocad Meeting, Nancy, France },
 title = { GOCAD StreamLab Revisited for Hydrogeology Applications },
 year = { 2008 }
}