Study Of Image Effect And Forward Modeling On Metal Ore Exploration By Using Random Media

The media are usually non-uniform when the seismic exploration data is actually processing, and there is often plenty of very irregular and small-scale anomalies. With the seismic exploration data processing becomes more and more sophisticated, the chosen frequency becomes higher and higher(shorter wavelength), these small-scale anomalies apparently have some impact on the propagation of seismic waves. However, it is difficult to accurately describe this type of small-scale anomalies for traditional model. Faced with this problem, people choose to use random media model of statistical theory to describe.With the growing numbers of application of seismic exploration used in mining exploration, the forward modeling of seismic wave in the complex metal ore media becomes particularly important. Finite difference method and pseudo-spectral method are two important wave field simulation methods, it is suggested by previous studies that they both have distinct advantages and disadvantages. The finite difference method has high precision but serious dispersion, while the pseudo-spectral method has high computational efficiency and accuracy, but lower precision.In this paper, it not only takes the characteristics of the complex metal mining structure into account, but also adds random media to simulate the complex effect of wave field which metal ore media produced. First, it briefly introduces the random media and the related principles of two forward methods. Then it presents a complex metal ore model, and random media is added, it analyzes the effect on the overall shape of the state model, geological structure and random media character of metal ores random media by controlling variable different parameters, and numerical simulation of seismic wave is conducted in both finite difference method and pseudo-spectral method. Reverse time migration method of seismic waves is the most accurate image forming method in current migration methods, it is just the opposite to numerical modeling of seismic wave. In this paper, both the two forward algorithms are used to conduct backstepping calculation, and migration results of velocity model are obtained by using the reverse time migration imaging condition, and further verified. At last it concludes that the proportion of random media is also an important factor affecting metal ore random media in addition to the variance and correlation length, the reverse time migration results of both the two kinds of forward methods can come to good imaging results, and the results have no significant differences.