This book is essentially about stratigraphic traps for oil and gas. Many of the examples discussed are geomorphologic features having inherent closures without any secondary structural element; others are primarily geomorphologic features modified by folding or faulting to produce local closures. The first category comprises traps that are purely stratigraphic, although the accumulation of hydrocarbons may have been assisted by regional or local tilting of the strata, or by deformation caused by compaction of the underlying sediments. The second category, which includes a much larger number of known examples, comprises structural-stratigraphic traps. Many of these traps have proved to be elusive, particularly those of the first category which commonly defy detection by seismic methods. In some cases, discovery has been accidental, and further exploration to delineate the accumulation has been empirical.

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