GIS BASED RESEARCH ON SPATIAL PATTERNS OF FRACTURES IN GRANITIC ROCK

The structural fractures(mainly refers to the joints scale) in granitic rock are selected as the research object. The spatial patterns of fractures are analyzed with the geostatistic tool that aims at fracture density P21 as regionalized variable. It turns out that the spatial distribution of fractures in Beishan area is obviously anisotropic and has a significant variation axis direction. Meanwhile, the geostatistical characteristics of grouped fractures in variation spindle region indicate that the first grouped fracture is not stochastic uniform but with an obvioushole-effect characteristic. This characteristic should be considered in the 3D fracture network modeling work. And a new method for 3D fracture network modeling is proposed based on the consideration of hole-effect characteristic.