【摘要】 由于金属矿地质模型一般具有强非均匀性,造成金属矿地震勘探中采集到的信号杂乱,应用常规的反射地震处理技术难以获得可靠的成像效果。而基于惠更斯-菲涅尔原理的散射成像方法能充分利用地震信号中的全波场信息,例如反射波、绕射波、回转波、直达波、转换波等,它们都是散射波的一种表现形式,从而可以获得较好的成像效果。结合中国东部典型铜矿-铜陵冬瓜山铜矿与中国西部典型锡矿-云南个旧锡矿的地质模型,我们模拟了散射波地震记录,并通过散射成像方法获得了高质量的偏移结果,从数值模拟角度证明了散射成像在金属矿地震勘探中具有较好的应用前景。更多还原

【Abstract】 The seismic data collected during the base metal exploration can be hampered by a variety of non-reflecting signals because of the heterogeneity of ore bodies and host rocks.It is difficult to produce a high-quality seismic profile when conventional seismic processing algorithms are applied to the data.According to the Huygens-Fresnel principle,every grid node can be considered as a vibrating source,and geological model can be discrete within the grids.Therefore we have stacked all kinds of waves,including scattered waves from these grids.It seems that the more scattered signals are used and the better the migrated section is.Two geological models are simulated and tested,one is the Tongling copper mine in the eastern China,and another is Gejiu tin mine in Yunnan Province of the south-western China.We have simulated the seismic scattering wave generated high-quality migrated seismic profiles,which match the geological models very well.It proves that imaging of the seismic scattered wave may be an appropriate tool to process the seismic data in base metal exploration.更多还原