Abstract
We present ultrasonic laboratory measurements on synthetic sandstones with controlled fracture density and geometry. New construction methods can provide more realistic synthetic sandstones. We built a set of sandstones containing different fracture densities, with fracture diameter about 3mm and fracture thickness about 0.06mm. P-wave and S-wave anisotropy in each sample were measured in an ultrasonic measurement system. Laboratory results show the influence of fracture density on P-wave and S-wave anisotropy. Shear wave splitting in parallel direction increases with fracture density. However, the same fracture density can be caused by a few large fractures or many small fractures. To observe the effect of fracture scale on P and S wave anisotropy, we built a set of samples with the same fracture density but different fracture scales. These samples were measured and analyzed to study the influence of fracture scale on P and S wave anisotropy and shear wave splitting.
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