Abstract
Summary Nowadays, prestack depth migration (PSDM) that aims to produce an image of seismic reflection interfaces, has played an important role in the oil and gas exploration. However, it has not been widely used in industry production, because there was not a method could consider high image accuracy and computational efficiency at the same time. Popov et al. provided depth migration by the Gaussian beam summation method in 2008, which was also called reverse time migration with Gaussian beams (GBRTM). It combines the advantages of the high computational speed of ray-based migration with the high accuracy of reverse time wave equation migration. A lot of researches have indicated that anisotropy is a very important factor of prestack depth migration. It will cause inaccurate imaging phenomena if ignored during processing. In this paper we present an approach of prestack depth migration by the Gaussian beam summation (GBS) method in anisotropic media. Our algorithm is suited for efficient imaging of geologic target subsurface. The migration results and ADCIGs obtained verify the correctness and validity of our method.
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