DMO校正技术在深层地震资料处理中的应用

The application of DMO method in deep seismic data processing

深层地质构造复杂、断层发育,油气勘探与地震资料处理工作者始终致力于其油、气资源的勘探及地震资料处理技术的研究工作,力求在深层地震勘探中有所突破。由于常规的地震资料处理手段难以满足地质解释精度要求,因此进行了倾角时差(DMO)校正技术研究。该技术是将动校正后的数据偏移到倾斜反射界面零偏移距位置上,能够解决深层构造成像问题。资料处理结果表明,在采用合适的叠前去噪及合理的静校正方法基础上,通过精确的DMO速度分析实现DMO校正处理后,能够使来自不同方向的反射波有效叠加,从而提高横向分辨率,不仅消除了速度分析过程中不同倾角带来的影响,而且使统射波得到加强。经DMO校正技术处理后,能够获得水平层和倾斜界面同时存在的高信噪比资料,使倾斜地层及复杂断裂等深层地质构造正确成像,确保更加真实地反映地下构造形态。

The structure is complicated and fulled of faults in deep layer. The exploration and seismic data processing workers devote themselves to the study of reservoirs and resources and the technical of seismic data processing. They do their best to look for making progress in oil and gas exploration. It is difficult to reach the accu-racy of geological interpretation using common seismic data processing method, so we have done a lots of work in dip moveout correc-tion (DMO) . The normai moveout corrected seismic data are mi-grated to the zero offset dipping reflector, which solves the problem in deep layer image. The real seismic data processing showed that the horizontal resolution is increased, the effects of dip angle in ve-locity analysis are removed and the diffraction is enhanced through DM0 processing based on appropriate prestack noise attenuation, rational NMO methord and accurate velocity analysis. After the DMO processing the signal-to-noise ratio of the dip and the horizontal reflector is raised. The accurate image of dipping layer and complicated faults is reached, the real structure form is represen-ted.