Figure 12 is a plot made before the drilling of any of the discovery wells. It combines rock property volumes from
the inverted seismic data with the ellipses representing the rock property modelling results. Firstly, an anomaly
was identified. The points from each of the rock property volumes in the region of the anomaly are the samples in
the cross plot. Then three polygons are drawn. The first represents a potential sealing shale, the second represents
a potential gas sand and the third a potential down dip brine sand. The points in each polygon are then highlighted
on the crossplot and color coded accordingly. Next, the ellipses representing the PDFs at the mid-point depth of
the corresponding polygon are superimposed over the top of the plot. They show a remarkable alignment between
the model results and cross plotted rock property volumes.
This engendered confidence in the inversion and modelling
procedures. The next step was a Bayesian update.