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The time slice was described earlier as the first step toward 3-D interpretation of a 3-D seismic volume. A time-slice view of the data is an improvement over vertical sections for the interpretation of depositional systems because it provides the opportunity to see a portion of depositional systems in map view. This view is key to interpreting these systems because it allows a view of the morphology of the system, which facilitates its recognition.

The time slice is the first step toward 3-D interpretation of a 3-D seismic volume. A time-slice view of the data is an improvement over vertical sections for the interpretation of depositional systems because it provides the opportunity to see a portion of depositional systems in map view. This view is key to interpreting these systems because it allows a view of the morphology of the system, which facilitates its recognition.

==Structural effects==

==Structural effects==

A time slice provides at best an image of a small portion of a depositional system. Subsequent structural deformation of the depositional surface typically means that only a small portion of a depositional system is imaged on a time slice. In fact, as the structural relief increases, the anomalies on the time slice associated with the structure quickly dominate the image.

A time slice provides at best an image of a small portion of a depositional system. Subsequent structural [[deformation]] of the depositional surface can mean that only a small portion of a depositional system is imaged on a time slice. In fact, as the structural relief increases, the anomalies on the time slice associated with the structure quickly dominate the image.

==Horizon slices==

==Horizon slices==

==Example vertical slice==

==Example vertical slice==

Figures 13-9, 13-10, and 13-11 illustrate the value of the horizontal slice view of the data. The figure below is a portion of a vertical seismic section from a 3-D seismic survey in the North Sea. The interpreted horizon, at approximately 2 seconds, is the Top Paleocene. Approximately 120 ms below this, at about the level indicated by the arrows, the section crosses a 1-km-wide Paleocene deepwater turbidite channel.

interpreting-3-d-seismic-data_fig13-9.png|{{figure number|1}}. Copyright: Dorn;<ref name=Dorn1998>Dorn, G. A., 1998 Modern 3-D seismic interpretation: The Leading Edge, vol. 17, no. 9, p. 1262–1272.</ref> courtesy SEG.

interpreting-3-d-seismic-data_fig13-11.png|{{figure number|3}}. Copyright: Dorn;<ref name=Dorn1998 /> courtesy SEG.

[[file:interpreting-3-d-seismic-data_fig13-9.png|thumb|{{figure number|13-9}}. Copyright: Dorn, 1998; courtesy SEG.]]

[[:file:interpreting-3-d-seismic-data_fig13-9.png|Figures 1]], [[:file:interpreting-3-d-seismic-data_fig13-10.png|2]], and [[:file:interpreting-3-d-seismic-data_fig13-11.png|3]] illustrate the value of the horizontal slice view of the data. [[:file:interpreting-3-d-seismic-data_fig13-9.png|Figure 1]] is a portion of a vertical seismic section from a 3-D seismic survey in the [[North Sea]]. The interpreted horizon, at approximately 2 seconds, is the Top Paleocene. Approximately 120 ms below this, at about the level indicated by the arrows, the section crosses a 1-km-wide Paleocene deep-water [[turbidite]] channel.

==Example time slice==

==Example time slice==

The figure to the right is a time slice that intersects a portion of the channel. On both the vertical section (Figure 13-9) and the time slice, the channel is difficult to interpret, even though the feature is quite large. Most of the amplitude patterns on the time slice are associated with structure, not stratigraphy.

[[:file:interpreting-3-d-seismic-data_fig13-10.png|Figure 2]] is a time slice that intersects a portion of the channel. On both the vertical section ([[:file:interpreting-3-d-seismic-data_fig13-9.png|Figure 1]]) and the time slice, the channel is difficult to interpret, even though the feature is quite large. Most of the amplitude patterns on the time slice are associated with structure, not stratigraphy.

 

==Example horizon slice==

==Example horizon slice==

This figure is a horizon slice 120 ms below the Top Paleocene horizon. The shape of the horizon slice is defined by the shape of the Top Paleocene horizon. This surface is shifted 120 ms down, and the seismic amplitudes are extracted where the shifted surface intersects the 3-D volume of data. The 1-km-wide channel is unmistakable on this view of the data, and both edges of the channel are readily interpretable.

[[:file:interpreting-3-d-seismic-data_fig13-11.png|Figure 3]] is a horizon slice 120 ms below the Top Paleocene horizon. The shape of the horizon slice is defined by the shape of the Top Paleocene horizon. This surface is shifted 120 ms down, and the seismic amplitudes are extracted where the shifted surface intersects the 3-D volume of data. The 1-km-wide channel is unmistakable on this view of the data, and both edges of the channel are readily interpretable.

 

==See also==

==See also==

* [[Proportional slices and 3-D volume visualization]]

* [[Proportional slices and 3-D volume visualization]]

==External links==

==External links==

[[Category:Predicting the occurrence of oil and gas traps]]  

[[Category:Predicting the occurrence of oil and gas traps]]  

[[Category:Interpreting 3-D seismic data]]

[[Category:Interpreting 3-D seismic data]]