Hydraulic fracturing definition

Geological information of the rock sequence and tectonic settings may be instructive but not definitive, as it is hard to translate field data into hydraulic conductivity values a shale bed may be fractured and let water flow through in one case, and a clay bed may be weathered and act as an aquiclude in another. In addition, a variety of processes lower the local water conductance, occasionally preventing lateral flow. An example of such a process is chemical clogging (Goldenberg et al., 1983). 

The DFN simulation cases were constructed to emulate the hydraulic behaviour of a typical Swedish granitic rock volume. In an earlier study (Gutters et al., 2(XX)), the geometric and hydraulic properties of the DFN model were based on the prototype repository and the TRUE Block Scale site at the Aspo Hard Rock Laboratory, Sweden. Since then, the DFN for the prototype repository was updated, Stigsson et al. (2001) carried out an extensive analysis of pump tests which has led to an improved understanding of the fracture set definition and their hydraulic properties their model was used in Gutters (2002). 

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