stratigraphic traps

Aug 14th, 2016
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Depositional TrapsStratigraphic trap geometry is due to variations in lithology. These variations may be controlled by theoriginal deposition of the strata, as in the case of a bar, a channel or a reef. Alternatively, the change maybe post-depositional as in the case of a truncation trap, or it may be due to diagenetic changes.For reviews on the concept of stratigraphic traps, the reader is referred to Dott and Reynolds (1969) andRittenhouse (1972). Major sources of specific data on stratigraphic traps can be found in King (1972),Busch (1974), and Conybeare (1976).Levorsen (1967) defines a stratigraphic trap as "one in which the chief trap-making element is somevariation in the stratigraphy, or lithology, or both, of the reservoir rock, such as a facies change, variablelocal porosity and permeability, or an upstructure termination of the reservoir rock, irrespective of thecause."Stratigraphic traps are harder to locate than structural ones because they are not as easily revealed byreflection seismic surveys. Also, the processes which give rise to them are usually more complex thanthose which cause structural traps.A broad classification of the various types of stratigraphic traps can be made. However, classifying trapshas its limitations because many oil and gas fields are transitional between clearly-defined types.Table 1 ,Table 1(Classification of stratigraphic type hydrocarbon traps) based on the scheme proposed by Rittenhouse(1972), shows that a major

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