Title:

Convective Dispersion in a Real Fracture

Authors:

Fabrice Bauget and Mostafa Fourar

Key Words:

fracture, tracer, convection dispersion

Conference:

Stanford Geothermal Workshop

Year:

2007

Session:

Reservoir Engineering

Language:

English

File Size:

489KB

View File:

Abstract:

Solute transport in fractured rocks is of major interest in many applications: geothermal energy production, petroleum industry, ground water management. This work focuses on a dispersion experiment performed with a transparent replica of a real fracture. The local aperture map was extracted using the well-known Beer-Lambert law, which shows a very heterogeneous medium. The hydrodynamic aperture was determined from single-phase flow measurements by assuming the validity of cubic law. Numerical simulation on the aperture map leads to the same aperture value. A tracer experiment was then performed at a Peclet number high enough to neglect molecular diffusion. While the classical convection-diffusion approach fails to interpret experimental results, a basic model of parallel rectangular ducts with local piston-like flow captures most of the breakthrough curve shape. The later corresponds to pure convection dispersion due to apertures and streamlines geometry distribution.


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