Land Data PSTM Versus PSDM Comparison

Figures 10, 11, 12, and 13, are examples from a 3D land survey near Daxing, China. What they all show is that wave equation migration is generally better at fault definition than single arrival based Kirchhoff methods. It is also much better at amplitude preservation, even when, as in the one way case, it is not perfect.

Figure 10: PSTM (top) versus PSDM (bottom) on land data near Daqing China

Figure 11: PSTM (top) versus PSDM (bottom) on land data near Daqing China

Figure 12: PSTM (top) versus PSDM (bottom) on land data near Daqing China

Figure  13 shows that when the data is over tertiary soft rock geology, the difference between various migration algorithms can be small. While certain parts of the top figure are better than the bottom figure, seeing the differences requires a sharp eye.

Figure 13: Curved ray PSTM (top) versus Straight Ray (bottom) on land data near Daqing China (a) Curved ray Kirchhoff PSTM (b) Straight ray Kirchhoff PSTM