How to use the trap classification scheme
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One geologic element may control the existence of a trap. These are pure stratigraphic, structural, or fluidic traps. But many traps are a combination of two or three geologic elements. In these traps, basic trapping elements occur in combination to provide the ultimate trapping mechanism. Classifying combination traps is a matter of deciding which are the primary, secondary, and, in some cases, tertiary controlling elements. This section discusses the classification of simple and combination traps and shows some examples of how to classify them.