Fluid flow partitioning between fractures and a permeable rock matrix

Details Fluid flow partitioning between fractures and a permeable rock matrix Fluid flow partitioning between fractures and a permeable rock matrix

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3107602m&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 7, CiteID L07602

Physics

Geophysics

7

Hydrology: Groundwater Hydrology, Mathematical Geophysics: Nonlinear Dynamics, Physical Properties Of Rocks: Fracture And Flow, Physical Properties Of Rocks: Permeability And Porosity, Physical Properties Of Rocks: Transport Properties

Scientific paper

Field data-based finite-element simulations of flow partitioning between fractures and a permeable rock matrix reveal critical fracture aperture values that mark the transition from matrix to fracture dominated flow. For matrix permeabilities of 0.00 1-1 D, the matrix either dominates or contributes significantly to the total flow. The percentage of the flow-normal cross-section that is occupied by fractures, Af, strongly influences the fracture-matrix permeability ratio, above which fractures will dominate flow. This ratio is 102-104 for Af = 10-4-10-3 (mean = 5 × 10-3), but also depends on the proportion of fractures which fully penetrate the representative elementary volume. Fluid-velocity spectra for the fractured rock have three important characteristics: (1) Darcy velocity is only poorly correlated with permeability, (2) flow velocities have characteristic values, even if fracture-length frequency relations are self similar, and (3) fracture and matrix velocities overlap.

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