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In this paper, I implemented an integrated velocity inversion scheme and applied it to a synthetic model. The surface reflection data and VSP data are used simultaneously to invert the slowness model. To integrate the surface reflection and VSP tomography, I simply use an identity operator as the integration operator. Therefore, the VSP tomography and surface reflection tomography have uniform contributions to their integration. Compared to the surface reflection tomography, the integrated inversion result is better in areas where the VSP ray coverage is good and conversely, the integrated inversion result is poorer in the areas where VSP ray coverage is sparse or inexistent.
The integrated inversion result obtained by using an identity operator suggests that we can improve the result if we can obtain a well-designed integration operator. For example, if the integration operator can afford more weights to the tomography (VSP or surface reflection) where this tomography result is more accurate, the integration tomography can bring more accurate inversion result throughout the model than either tomography alone.

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Stanford Exploration Project

7/8/2003