Kirchhoff wave-equation datuming with irregular acquisition topography

Dimitri Bevc

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ABSTRACT

Seismic data gathered on land is distorted by irregular acquisition topography. Most seismic imaging algorithms are applied to data which is shifted to a planar datum. In regions of mild topography a static shift is adequate to perform this transformation, however as the necessary shift increases in magnitude, the static approximation becomes inadequate. In this situation a procedure based on wave-equation extrapolation is more appropriate than static shift. After describing the Kirchhoff datuming algorithm I apply it to a deep-water marine data set and to synthetic land data. The land data examples demonstrate that wave-equation datuming is more appropriate than static shift in regions of large topographic relief.