structural traps

Aug 14th, 2016
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Structural TrapsThe geometry of a structural trap is due essentially to some post-depositional modification of thereservoir.In the words of Levorsen (1967) "A structural trap is one whose upper boundary has been made concave,as viewed from below, by some local deformation, such as folding, or faulting, or both, of the reservoirrock."Selley (1982) has further defined the boundaries of a structural trap, thus "The edges of a pool occurringin a structural trap are determined wholly or in part by the intersection of the underlying water table withthe roof rock overlying the deformed reservoir rock." Structural traps are divided into those due to folding,and those due to faulting.Fold Traps ( Compressional )Anticlinal traps which are due to compression are most likely to be found in or near geosynclinal troughs.These troughs are usually associated with active continental margins where there is a net shortening ofthe earth's crust ( Figure 1 , Active continental margin with net shortening of crust- subduction zone).Figure 1In California, the Tertiary basins form a major hydrocarbon province which contains compressionalanticlinal traps. Within this province are a number of fault-bounded troughs infilled by thick regressivesequences in which organic-rich basinal muds are overlain by deep-sea sands and capped by youngercontinental beds as shown by Figure 2 (Generalized west-southwest-east-northeast structural crosssection), a cross- section of the Los Angeles basi

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