Journal
INTERNATIONAL JOURNAL OF OIL GAS AND COAL TECHNOLOGY
Volume 5, Issue 2-3, Pages 182-206Publisher
INDERSCIENCE ENTERPRISES LTD
DOI: 10.1504/IJOGCT.2012.046320
Keywords
pore-scale modelling; permeability; fractures; fractured porous media; lattice Boltzmann; X-ray computed microtomography.
Funding
- National Science Foundation [0747585]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [0747585] Funding Source: National Science Foundation
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The objective of this work is to investigate fracture flow characteristics at the pore-scale, and evaluate the influence of the adjacent permeable matrix on the fracture's permeability. We use X-ray computed microtomography to produce three-dimensional images of a fracture in a permeable medium. These images are processed and directly translated into lattices for single-phase lattice Boltzmann simulations. Three flow simulations are presented for the imaged volume, a simulation of the pore space, the fracture alone and the matrix alone. We show that the fracture permeability increases by a factor of 15.1 due to bypassing of fracture choke points through the matrix pore space. In addition, pore-scale matrix velocities were found to follow a logarithmic function of the distance from the fracture. Finally, our results are compared against previously proposed methods or estimating fracture permeability from fracture roughness, tortuosity, aperture distribution and matrix permeability. [Received: April 28, 2011; Accepted: July 29, 2011]
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