traps types

Aug 14th, 2016
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Hydrodynamic TrapsIn a hydrodynamic trap, a downward movement of water prevents the upward movement of oil or gas.Pure hydrodynamic traps are extremely rare, but a number of traps result from the combination ofhydrodynamic forces and structure or stratigraphy.An ideal hydrodynamic trap is shown in Figure 1 (Schematic cross-section of an ideal hydrodynamic trap).Figure 1A monoclinal flexure is developed which has no genuine vertical closure; oil could not be trapped within itin a normal situation. Groundwater, however, is moving down through a permeable bed and is preventingthe upward escape of oil. Oil is trapped in the monoclinal flexure above a tilted oil-water contact. Purehydrodynamic traps like this, however, are very rare.There are a number of fields with tilted oil-water contacts where entrapment is a combination of bothstructure and hydrodynamic forces ( Figure 2 , Schematic cross-section showing entrapment from bothstructural and hydrodynamic forces).Figure 2For further discussion of the effect of hydrodynamic conditions on hydrocarbon traps, the reader isreferred to Goebel (1950), Hubbert (1953), Yuster (1953), and Eremako and Michailov (1974).Combination TrapsCombination traps result from two or more of the basic trapping mechanisms ( structural, stratigraphic,and hydrodynamic ). Since there are many ways in which combination traps can occur, a few examplesmust suffice for explanation.In the Main Pass Block 35 field of offshore Louisiana,

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