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| Author(s): |
Matheus Fabiano Pila
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Instituto de Matemática, Estatística e Computação Científica |
| Defense date: | 2011-10-14 |
| Examining board members: |
Joerg Dietrich Wilhelm Schleicher;
Amin Bassrei;
Daniela Rego Amazonas;
Jessé Carvalho Costa;
Lucio Tunes dos Santos
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| Advisor: | Maria Amélia Novais Schleicher; Joerg Dietrich Wilhelm Schleicher |
| Abstract | |
The surface where the source-receiver pairs used in the seismic aquisition are positioned is called a datum. This datum can be flat or irregular and the depth may vary. The main goal of redatuming is to transform the seismic data acquired on the original surface into simulated data as if acquired on another datum. The advantage of this process is that it can eliminate undesired seismic wave propagation in layers with strong velocity variation or strong topography. The correct amplitude transformation, from the original surface data to the new datum, is of fundamental importance if the data are to be used in subsequent true-amplitude processes that allow better characterization of potential reservoirs, for example. One of these processes is the true-amplitude migration. In the literature, there are studies that argue and prove that a true-amplitude configuration transform can be obtained by chaining the weighted migration and demigration integral operators. In this thesis, we extend this result and derive a true-amplitude redatuming operator. For this purpuse, we consider that in this chaining procedure, we can also change the depth of the source-receiver pairs, either in the input or simulated output configuration. Kirchhoff processes like this one depend on a good velocity model in order to calculate traveltime corrections for each trace. Throughout this work, we demonstrated that the kinematics of redatuming is independent of the velocity below the new datum. This velocity affects only the weight function that corrects the amplitudes. However, our numerical tests indicated that small uncertainties inserted in this variable resulted in little relative error in the final amplitude (AU) | |
| FAPESP's process: | 05/00305-0 - Kirchhoff migration incorporating Kirchhoff redatuming |
| Grantee: | Matheus Fabiano Pila |
| Support Opportunities: | Scholarships in Brazil - Doctorate |