Changes

==Step 2: Pick seismic horizons==

==Step 2: Pick seismic horizons==

[[file:interpreting-seismic-data_fig12-12.png|left|thumb|{{figure number|1}}(a) Representative line from the Glenn Pool data volume with sonic overlay and tracked events; (b) Horizon amplitude and time structure maps for the Wilcox. From Liner.<ref name=Liner_1999>Liner, Chris, Elements of 3-D Seismology: Tulsa, PennWell.</ref> Courtesy PennWell.]]

[[file:interpreting-seismic-data_fig12-12.png|300px|thumb|{{figure number|1}}(a) Representative line from the Glenn Pool data volume with sonic overlay and tracked events; (b) Horizon amplitude and time structure maps for the Wilcox. From Liner.<ref name=Liner_1999>Liner, Chris, Elements of 3-D Seismology: Tulsa, PennWell.</ref> Courtesy PennWell.]]

For 2-D data, only the traveltime to each event of interest is recorded with its coordinate along the line ''t''(''x''). For 3-D data, both traveltime and amplitude at each (''x, y'') are available from the seismic data cube, ''t''(''x, y'') and ''a''(''x, y''). The traveltimes form a time structure map, and the amplitudes are a horizon slice. [[:file:interpreting-seismic-data_fig12-12.png|Figure 1A]] shows a representative line from the Glenn Pool data volume with sonic overlay and tracked events. Horizon amplitude and time structure maps for the Wilcox are shown in [[:file:interpreting-seismic-data_fig12-12.png|Figures 1B, C]].

For 2-D data, only the traveltime to each event of interest is recorded with its coordinate along the line ''t''(''x''). For 3-D data, both traveltime and amplitude at each (''x, y'') are available from the seismic data cube, ''t''(''x, y'') and ''a''(''x, y''). The traveltimes form a time structure map, and the amplitudes are a horizon slice. [[:file:interpreting-seismic-data_fig12-12.png|Figure 1A]] shows a representative line from the Glenn Pool data volume with sonic overlay and tracked events. Horizon amplitude and time structure maps for the Wilcox are shown in [[:file:interpreting-seismic-data_fig12-12.png|Figures 1B, C]].