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ABSTRACT ABSTRACT: Fracture traces and seismic event location data were examined and numerical experiments performed to test whether scale-invariant fracture trace patterns can be represented by point patterns generated at discrete trace sites. Point pattern data censored in different ways were examined with respect to the effects on fractality. A sparse fractal point data set remains fractal, but the scale range of fractality decreases as sparseness increases. Thus, a seismic event location point pattern may not adequately represent the full scale over which the parent faults are fractal. An example of the inverse problem of determining the fractal nature of unknown fault traces from seismicity is given.
- Energy > Oil & Gas > Upstream (0.48)
- Law > Civil Rights & Constitutional Law (0.35)
- North America > United States > Utah > Book Cliffs Field (0.89)
- North America > United States > Colorado > Piceance Basin > Plateau Field > Williams Fork Formation (0.89)
- North America > United States > Colorado > Piceance Basin > Plateau Field > Iles Formation (0.89)
- Well Completion > Hydraulic Fracturing (1.00)
- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs > Naturally-fractured reservoirs (0.71)
- Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (0.70)
- Reservoir Description and Dynamics > Reservoir Characterization > Faults and fracture characterization (0.48)
Its capability, however, in rock engineering has not been clarified sufficiently, that is, a constructed tomographic image docs not help our understanding on joint characteristics by itself. It is because the propagation velocity of a seismic wave remains being as an overall index of the dynamic behaviour of a rock mass without clarifying any characteristics of rock mass. The first author initiated the study on the relationship between seismic behaviour and mechanical properties of jointed rock in association with the research for the magnitude of loosening event during the construction of the long suspension bridge in late 1970s [Tanimoto & Ikeda, 1983J. Our experimental study in laboratory on seismic behaviour has been carried out with respect to joint orientation, joint frequency, aperture, roughness, infilling material, alteration, moisture content, etc. under normal and shear stresses [Tanimoto, et aI., 1994a]. To speak of the representation of joint roughness, Barton's JRC has been conveniently employed, but the determination of a JRC-value has to be estimated with referential profiles given by Barton et al. [Barton, et aI., 1977].
- Geology > Rock Type (0.94)
- Geology > Geological Subdiscipline > Geomechanics (0.68)
The fracture system and fluid flow cluster are described with lattice models. A randomly constructed fractal model is used to simulate fractured rock mass, and the fracture distribution is expressed by a fractal measure. The fluid diffusion fronts are given by random walk on fractals. The flow distribution through a fractal object are studied by numerical modeling.