Traps are the configuration of rocks which are suitable for preventing further migration of hydrocarbons. Hydrocarbons are unable to migrate, as they are sealed by a relatively impermeable formation. Traps are broadly classified as 1.Structural traps, 2.Stratigraphic traps and 3.Combination traps.

Structural traps occur in deformed strata such as folds or faults and stratigraphic traps occur in zones such as unconformities, pinch-outs and reefs. Sometimes sealing of hydrocarbon occurs by combination of both stratigraphic and structural traps. These types of traps are called combination traps.

A trap is an integral constituent of a petroleum system. Buoyancy makes the petroleum transfer upwards and laterally from source to reservoir. Petroleum will effectively displace groundwater and flow upwards, as it is lighter than water. It will

also flow laterally and will seep to the surface through faults and porous overburden rocks unless confined under special circumstances to become trapped and form economic petroleum deposits.

Various types of Traps found are:-

  1. Cap rock
  2. Structural Traps
  3. Anticlinal Traps
  4. Fault Traps
  5. Salt Dome Traps
  6. Statigraphic Traps
  7. Combination Traps

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