Evidence For Velocity Anisotropy In Sediments Of The Central Bredasdorp Basin

Oil exploration boreholes drilled in the central part of the offshore<br>Bredasdorp basin (fig. 1) revealed systematic errors in the prediction<br>of depths to target horizons.<br>Initially, in the absence of borehole data, depth conversions from<br>seismic reflection time measurements were made using stacking<br>velocities. Because of the very small dips present in the central<br>Bredasdorp basin down to horizons of interest, stacking velocity was<br>assumed to be equal to root-mean-square (ns) velocity without any<br>correction for dip.