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常规的NMO技术是在假设地层各向同性的前提下提出来的,而真实的地层却是各向异性的,如果用常规的NMO技术进行地震数据的处理势必会影响数据的成像质量。近些年来随着海上地震采集技术的不断发展,电缆长度不断增加,使得地层各向异性的影响更加突出。本文对不同海域大偏移距地震数据进行了高密度各向异性速度分析技术的应用,从对比该技术与常规NMO技术得出的道集和叠加剖面上看,该技术获得了更好的效果,从而论证了高密度各向异性速度分析技术能够较好地解决地层各向异性带来的问题。
The conventional NMO technology is proposed on the assumption that the formation is isotropic. However, the real formation is anisotropic. If the seismic data is processed by the conventional NMO technology, it is bound to affect the imaging quality of the data. In recent years, with the continuous development of marine seismic acquisition techniques, the increasing cable length has made the influence of formation anisotropy more prominent. In this paper, the application of high-density anisotropy velocity analysis technique for large-offset seismic data in different sea areas is studied. This technique obtains better results compared with the gathers and superposition profiles derived from this technique and conventional NMO techniques , Which proves that the high density anisotropic velocity analysis technology can well solve the problems caused by formation anisotropy.