Changes

==The onion==

==The onion==

[[file:interpreting-seismic-data_fig12-1.png|thumb|300px|{{figure number|1}}Seismic data is built of several layers like an onion. Copyright: Liner, 1999; courtesy PennWell.]]

[[file:interpreting-seismic-data_fig12-1.png|thumb|300px|{{figure number|1}}Seismic data is built of several layers like an onion. Copyright: Liner;<ref>Liner, C., 1999, Elements of 3-D Seismology: Tulsa, PennWell.</ref> courtesy PennWell.]]

The knowledge required for working with seismic data is built of several layers like an onion. [[:file:interpreting-seismic-data_fig12-1.png|Figure 1]] illustrates the idea. At the heart of the onion are 1-D seismic concepts like [[wavelet]], [[convolution]], [[traveltime]], and [[reflection coefficient]]. All this shows up in the next layer, 2-D seismic, plus [[Seismic array|arrays]], [[offset]], [[dip]], and [[lateral velocity]] variation. The next layer, 3-D seismic, includes all of 2-D plus [[azimuth]], [[Components of a 3-D seismic survey#Bins|bins]], and the [[3-D seismic: the data cube|data volume]]. Finally, 4-D seismic is time-lapse 3-D, which introduces [[repeatability]], [[Fundamentals of fluid flow|fluid flow]], and [[difference volume]].

The knowledge required for working with seismic data is built of several layers like an onion. [[:file:interpreting-seismic-data_fig12-1.png|Figure 1]] illustrates the idea. At the heart of the onion are 1-D seismic concepts like [[wavelet]], [[convolution]], [[traveltime]], and [[reflection coefficient]]. All this shows up in the next layer, 2-D seismic, plus [[Seismic array|arrays]], [[offset]], [[dip]], and [[lateral velocity]] variation. The next layer, 3-D seismic, includes all of 2-D plus [[azimuth]], [[Components of a 3-D seismic survey#Bins|bins]], and the [[3-D seismic: the data cube|data volume]]. Finally, 4-D seismic is time-lapse 3-D, which introduces [[repeatability]], [[Fundamentals of fluid flow|fluid flow]], and [[difference volume]].