Abstract: The noodle hang-like noise often presented in the seismic data of mountain area in Tarim basin greatly affects the validity of following deconvolution processing. It is difficult to effectively eliminate this kind of noise using conventional methods. A new approach named swell noise attenuation, which is based on spatial median filter arithmetic, can be adopted to suppress such a noise with some limitations. This paper presents spatial continuous velocity analysis technique, an effective solution to overcome these limitations. This technique depends on conventional NMO and mute as well as CMP velocity analysis, self-creates suitable velocity functions in order to resolve the deficiency existed in conventional velocity analysis. The case study shows that using this technique can be able to further improve the precision of stacking velocity and imaging in complex structural areas or with big variation of lateral velocity.

Key words: Tarim basin, seismic interpretation, noise, attenuation, stack velocity