Crossplots, visual representations of the relationship between two variables, are used to (a) visually identify outliers that may bias a correlation, (b) gain a visual sense for the strength of the correlation between variables, (c) detect if the relationship between variables is linear or nonlinear, (d) identify trends which may indicate multiple populations within the same data set, and (e) detect significant departures from a background trend—in other words to detect anomalies.

Crossplotting is widely used in AVO analysis, because it facilitates the simultaneous and meaningful evaluation of two attributes. Generally, common lithology units and fluid types cluster together in...

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