GEOPHYSICAL CORNER

By David Gray

Strike Analysis A Core Matter
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Figure 3: Azimuthally restricted pre-stack seismic gathers for orthogonal azimuths at the same location. The amplitudes in the box in the gather at left increase with increasing shot to receiver distance (from right to left), while the corresponding amplitudes in the orthogonal gather (right) have no change in amplitude. This difference is used to indicate the fracture direction and to estimate the fracture density.