Crustal heterogeneities and their statistical characteristics bear important information about the dynamic processes and evolution of the crust. The velocity well-log data from the German Continental Deep Drilling Project (KTB) offer a rare opportunity to measure directly the properties of crustal heterogeneities. In this study, we first estimated the power spectrum of crustal heterogeneities from the P-velocity well-logs of the two holes. For the first time, a power-law spectrum of crustal heterogeneities was directly observed in the spatial wavelength ranged from a few meters to a few kilometers. The slope of the vertical 1D power spectrum of the random velocity perturbations is about 1.1, corresponding to a flicker-noise random medium. The sale-anisotropy ratio (aspect ratio) and the horizontal spectral slope of crustal heterogeneities were also estimated by cross-correlation analysis between these two holes to be about 1.8 and 2.0, respectively. ¿ American Geophysical Union 1994