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• W3174586356 abstract "The Swedish Nuclear Fuel and Waste Management Company (SKB) is performing site characterization at two different locations, Forsmark and Laxemar, in order to locate a site for a final geologic repository for spent nuclear fuel. The program is built upon the development of Site Descriptive Models (SDMs) at specific timed data freezes. Each SDM is formed from discipline-specific reports from across the scientific spectrum. This report describes the methods, analyses, and conclusions of the geological modeling team with respect to a geological and statistical model of fractures and minor deformation zones (henceforth referred to as the geological DFN), version 2.2, at the Forsmark site. The geological DFN builds upon the work of other geological modelers, including the deformation zone (DZ), rock domain (RD), and fracture domain (FD) models. The geological DFN is a statistical model for stochastically simulating rock fractures and minor deformation zones as a scale of less than 1,000 m (the lower cut-off of the DZ models). The geological DFN is valid within four specific fracture domains inside the local model region, and encompassing the candidate volume at Forsmark: FFM01, FFM02, FFM03, and FFM06. The models are build using data from detailed surface outcrop maps and the cored borehole record at Forsmark. The conceptual model for the Forsmark 2.2 geological revolves around the concept of orientation sets; for each fracture domain, other model parameters such as size and intensity are tied to the orientation sets. Two classes of orientation sets were described; Global sets, which are encountered everywhere in the model region, and Local sets, which represent highly localized stress environments. Orientation sets were described in terms of their general cardinal direction (NE, NW, etc). Two alternatives are presented for fracture size modeling: - the tectonic continuum approach (TCM, TCMF) described by coupled size-intensity scaling following power law distributions. These models describe fracture intensity and size as a single range from borehole to outcrop scale; and - the combined outcrop scale and tectonic fault models (OSM+TFM), where separate distributions for size and intensity describe the fractures observed at outcrop scale (largely joints) and the features observed at regional scales (lineaments that are largely faults or deformation zones). Fracture intensity and fracture size are not rigidly coupled. The stochastic intensity model is build using power laws, and combines fracture intensity data from outcrops (P21) and boreholes (P10) to simultaneously match both data sets. Intensity statistics are presented for each fracture set in each domain, and the spatial variation of intensity described as a function of lithology or as a gamma distribution where possible. This report also describes the sources of uncertainty in the methodologies, data, and analyses used to build the version 2.2 geological DFN, and offers insight as to the potential magnitudes of their effects on downstream models. The outputs of the geological DFN modeling process are recommended parameters or statistical distributions describing fracture set orientations, radius sizes, volumetric intensities, spatial correlations and models, and other parameters necessary to build stochastic models (lithology and scaling corrections, termination matrices)" @default.
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• W3174586356 date "2007-11-15" @default.
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• W3174586356 title "Statistical geological discrete fracture network model. Forsmark modelling stage 2.2" @default.
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