The Idea...

For many years, we have been using Spectral Decomposition, and generating pretty pictures, by blending different responses from different spectral bands.

But, according to the theories behind the methods of spectral decomposition, they are more than pretty pictures, they contain a vast amount of geological, and possibly, reservoir, information.

One of those pieces of informations has to do with changes in thickness, or more generally, with thickness related properties (thickness, net-to-gross-, net-pay, etc.), and the effects of those changes on the spectral response of the seismic data.

We have looked into this idea, and tried different methods to get some of that information directly from those RGB BLENDED images. Well, we present a way to "grossly" estimate, directly from your blended images, values for thickness related properties, by ways of using our Blending Rainbow Charts.

These values can help you decide whether or not to go into a deeper investigation on a given event during exploration, or, when using well information, calibrate the results to get into a more quantitative study.

Actually, they are very good tools for deciding what range of spectral bands to use on specific targets.

This particular type of chart works well for "typical" clastic layering, or where we assume quasi-symmetrical impedance contrast at the top and base of the events of interest.