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| | Abstract | | Fresnel volume migration is proposed based on an idea of restricting the aperture in which a migration operator is applied in space and time. In this study, we consider the Fresnel volume migration for data acquired in our laboratory's water tank. A method using a prestack depth migration with the aperture restricted to the Fresnel volume is applied to image underground structure after the decomposition of recorded reflection data. For the decomposition, we use the method using tau-P transform. We also change the size of the Fresnel volume to the extent of the k-th Fresnel volume. Using incident angles for Fresnel volume migration can decrease the degrees of freedom. In fact, our method using the tau-P transforms effectively functioned both on the simulation data and on the experiment data. Our simulation results indicate that target focusing is increasing as the Fresnel volume size for migration is decreased. Tank data indicates that signals included in the 2nd Fresnel volume have not enough amplitude compared to the noise level. |
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