Submission #189

Submission information
Submitted by Anonyme (not verified)
Wed, 02/08/2017 - 09:09
Simulation of liquid gas flows in low permeability porous media with discrete fracture networks
PhD Thesis
The simulation of Darcy flow in fractured porous media is a major issue in many applications such as hydrogeology, geothermy, oil and gas exploitation as well as geological storages. The flow in such media is dominated by the connectivity and conductivity of the network of fractures coupled to the surrounding matricial porous medium. Their numerical modelling is crutial for a better management of underground resources. It is still a modelling and numerical challenge due to the geometrical complexity and multiscale nature of fracture networks and to the highly contrasted scale, petrophysical and hydrodynamical properties between the matrix and the fractures.

The PhD proposal focuses on the design of efficient models and numerical methods in order to simulate the flow of the liquid and gas phases in fractured geological media with low matrix permeability. The class of model studied in this PhD represents the fractures explicitely as a network of co-dimension one surfaces coupled with the surrounding matrix.

The main application targeted in this PhD deals with the simulation of the liquid gas tran- sient flow in the radioactive waste deep Callovo-Oxfordian geological storage studied by Andra. The drilling of the underground tunnels results in a damaged zone in the neighbourhood of the excavated galleries with fractures of variable connectivity. The final objective is to compare the models established during the PhD and using an explicit representation of the fracture network with equivalent medium models in order to assess the transient liquid gas flow simulations already carried out at Andra.
Sat, 07/01/2017