SEEPAGE PROPERTIES OF ROCK FRACTURES WITH POWER LAW LENGTH DISTRIBUTIONS
Abstract
Fractures with power law length distributions abound in nature such as carbonate oil and gas reservoirs, sandstone, hot dry rocks, etc. The fluid transport properties and morphology characterization of fracture networks have fascinated numerous researchers to investigate for several decades. In this work, the analytical models for fracture density and permeability are extended from fractal fracture network to general fracture network with power law length distributions. It is found that the fracture density is related to the power law exponents and the area porosity of fracture network. Then, a permeability model for the fracture length distribution with general power law exponent and the power law exponent for fracture length versus aperture is proposed based on the well-known cubic law in individual fracture. The analytical expression for permeability of fractured networks is found to be a function of power law exponents , area porosity of fracture network, and the micro-structural parameters (maximum fracture length , fracture azimuth and fracture dip angle ). The present model may shed light on the mechanism of seepage in fracture networks with power law length distributions.
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