Butterfly Chart
Butterfly Chart :
(n.) Formation Evaluation. A plot representing the effect of?invasion on resistivity measurements that have different depths of investigation. The plot assumes a step profile model of invasion and determines true resistivity, flushed zone resistivity and diameter of invasionfrom ratios of deep-, medium- and shallow-resistivity measurements. Strictly speaking, when both resistive and conductive invasion are plotted, the chart is called a butterfly chart. When only one is plotted it is known as a tornado chart. See: conductive invasion, depth of investigation, resistive invasion
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