Prestack Inverse-Ray Imaging of A 2D Homogeneous Layer: A Tutorial Study


Traveling directions of an inverse ray for the common shot, the common midpoint and the common offset gathers are explicitly determined from the geometry of reflected rays and an envelope of two reflected ellipses in a 2D homogeneous irregular layer. I find that a common shot gather can be applied to image the structural velocity and interface. However, due to the symmetry of the travel-time hyperbola, a common midpoint gather is not suitable for structural imaging. Futhermore, from a common offset gather, the prestack inverse ray is proved as a special case of the prestack inverse way. 

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