Changes

[[file:seismic-inversion_fig6.png|thumb|{{figure number|6}}Time slice displays through the 3-D survey of the river channel zone. The lightly shaded areas show low velocity material in which reservoir sands are present. Copyright: Western Geophysical.]]

[[file:seismic-inversion_fig6.png|thumb|{{figure number|6}}Time slice displays through the 3-D survey of the river channel zone. The lightly shaded areas show low velocity material in which reservoir sands are present. Copyright: Western Geophysical.]]

A 3-D survey measuring 2.2 by [[length::1.7 km]] was acquired, as indicated by the rectangle in [[:file:seismic-inversion_fig4.png|Figure 4]]. These data were then processed through to final migrated stack, and the result was inverted using the SLIM inversion method of Western Geophysical. This approach is similar to the model-based algorithm discussed earlier. The results of inverting one particular line from the 3-D volume are shown in [[:file:seismic-inversion_fig5.png|Figure 5]]. Two producing wells and one dry hole are shown in this line. The producing interval is between 640 and 660 msec on the two producers, whereas the low velocity zone on the dry hole comes from a sand that is porous but not prospective. [[:file:seismic-inversion_fig6.png|Figure 6]] shows a series of time slices (that is, horizontal cuts through the 3-D data volume at constant time intervals) over the complete dataset (see [[Mapping with two-dimensional seismic data]]). Borehole B from [[:file:seismic-inversion_fig5.png|Figure 5]], which was the dry hole, is indicated by the faint white crosshairs at the centers of the graphs in [[:file:seismic-inversion_fig6.png|Figure 6]]. The lightly shaded areas show areas of low velocity material at the zone of interest. Notice that this well is obviously mispositioned with respect to the low velocity reservoir material.

A 3-D survey measuring 2.2 by [[length::1.7 km]] was acquired, as indicated by the rectangle in [[:file:seismic-inversion_fig4.png|Figure 4]]. These data were then processed through to final migrated stack, and the result was inverted using the SLIM inversion method of Western Geophysical. This approach is similar to the model-based algorithm discussed earlier. The results of inverting one particular line from the 3-D volume are shown in [[:file:seismic-inversion_fig5.png|Figure 5]]. Two producing wells and one dry hole are shown in this line. The producing interval is between 640 and 660 msec on the two producers, whereas the low velocity zone on the dry hole comes from a sand that is porous but not prospective. [[:file:seismic-inversion_fig6.png|Figure 6]] shows a series of time slices (that is, horizontal cuts through the 3-D data volume at constant time intervals) over the complete dataset (see [[Seismic data - mapping with two-dimensional data]]). Borehole B from [[:file:seismic-inversion_fig5.png|Figure 5]], which was the dry hole, is indicated by the faint white crosshairs at the centers of the graphs in [[:file:seismic-inversion_fig6.png|Figure 6]]. The lightly shaded areas show areas of low velocity material at the zone of interest. Notice that this well is obviously mispositioned with respect to the low velocity reservoir material.

==Conclusions==

==Conclusions==