Question:
Which of the following hydrocarbon trap(s) is/are a result of sedimentary facies changes?
Which of the following hydrocarbon trap(s) is/are a result of sedimentary facies changes?
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Structural traps (e.g., folds, faults, salt domes) are tectonic in origin, while stratigraphic traps (pinch outs, sand lenses, unconformities) result from depositional or erosional facies changes.
Updated On: Aug 29, 2025
- Salt dome
- Unconformity
- Pinch out
- Sand lens
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The Correct Option is B
Solution and Explanation
- Hydrocarbon traps are broadly classified into structural traps (caused by tectonic deformation) and stratigraphic traps (caused by depositional or erosional processes, i.e., facies changes).
- Salt dome is a structural trap caused by diapirism of salt, not by facies change.
- Unconformity traps occur where erosion or non-deposition truncates reservoir units, followed by sealing. This is a stratigraphic effect.
- Pinch out traps form when a porous reservoir facies thins out and pinches against non-permeable facies. This is due to facies variation.
- Sand lens traps occur where isolated sand bodies are encased in shale due to depositional changes.
Hence, traps due to sedimentary facies changes are (B), (C), and (D).
- Salt dome is a structural trap caused by diapirism of salt, not by facies change.
- Unconformity traps occur where erosion or non-deposition truncates reservoir units, followed by sealing. This is a stratigraphic effect.
- Pinch out traps form when a porous reservoir facies thins out and pinches against non-permeable facies. This is due to facies variation.
- Sand lens traps occur where isolated sand bodies are encased in shale due to depositional changes.
Hence, traps due to sedimentary facies changes are (B), (C), and (D).
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