地震散射波模拟成像在金属矿勘探中的应用  

The Application of the Numerical Simulation and Imaging of Seismic Scattered Wave in Exploration of Metal Mineral Deposits

作　　者：李战业[1] 尹军杰[2] 王赟[2] 

机构地区：[1]青海省地质调查院,西宁810012 [2]中国科学院地质与地球物理研究所,北京100029

出　　处：《地质与勘探》2009年第2期80-84,共5页Geology and Exploration

基　　金：国家自然基金委员会"多分量转换波地震勘探中的面波法静校正研究"(编号:40574055)项目;科技部973"深部煤炭资源赋存规律;开采地质条件与精细探测基础研究"项目课题7"深部煤岩多相地质体的地球物理响应"(编号:2006CB202207)联合资助

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。The seismic data collected during the base metal exploration can be hampered by a variety of non - reflecting signals because of the hetero- geneity 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 an- other 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.

关 键 词：地震数据处理 地震散射波 金属矿勘探 惠更斯-菲涅尔原理 

分 类 号：P618.51[天文地球—矿床学]