Duplex Wave Migration and Corner Reflector Approximation

Two techniques for imaging of sub-vertical boundaries were studied. The first technique is a simplified approach and based on a corner reflector property which allows to create a zero-offset gather for focused duplex waves. The second technique is a duplex wave migration based on Kirchhoff integral. It was shown that even small deviation from a vertical direction of a corner reflector (by 10 degrees in our case) will result in that the processing with a simplified technique may lead to a wrong interpretation. We also showed that simplified processing of duplex waves generated by corner reflectors may not be applied to a general case of PSS duplex wave.