Flexibility. Inverse Scattering Series Method For Removal Of Multi-component Seabed Seismic Reflection Data In The Multiples

So far, two kinds of inverse scattering series have been found. One is used to remove the free surface multiples, the other is to suppress the internal multiples.In this paper, a totally new multiple removal approach, called inverse scattering series method, has been presented. It is setup for the ocean bottom reflection elastic seismic data. Different from all the existing de-multiple methods, this approach can directly remove all the free-surface multiple and internal multiple without any information of the subsurface, left the primaries untouched. So such method is perfect for the post-stack structure imaging and pre-stack amplitude analysis. The method has demonstrated its usefulness and added value for free-surface multiples when (l) the overburden has significant lateral variation, (2) reflectors are curved or dipping, (3) events are interfering, (4) multiples are difficult to identify, and (5) the geology is complex. These algorithms require knowledge of the source signature, near-source traces, broad band seismic data and high contrast between the reference and actual fields.The inverse scattering series method has been completely and systematically discussed.In the introduction, the origin and development of scattering theory has been introduced. The generating mechanism of all kinds of the reflection seismic data in the point scattering media has been illustrated. The relationship and differences between the forward scattering and inverse scattering method have been identified. The merits and the disadvantages of all the multiple removal methods have been summarized. The de-multiple of the free-surface and internal multiples has been simplified. The physical logic, which is that why such method needs nothing from the sub-surfaces has been interpreted. An feasible series method of source estimation has been brought out. In the second chapter, the forward scattering series methods have been deducted. Beginning from the scattering theory, the mechanism of the whole course of the reflection produced has been reconstructed. As to the different terms in this series, corresponding uses have been dug out. The forward course is mainly involved in removing the free-surface and internal multiples.In the third chapter, as to the marine case, inverse scattering series method for ocean bottom data has been adjusted to be effective enough. For the multi-component marine reflection data, a separating data method for p-s waves and up-down going waves has been introduced. The numerical experiment with this method shows that such unique approach is good enough.VThe elastic internal multiple suppression method has been demonstrated in the fourth chapter. This method is the same with the land case. Synthetic data test shows the this is a successful approach. Some key points in the practical processing have been singled out, which is helpful for the common use in the near future.The conclusion part involves in point out that though the inverse scattering series method can work perfectly in the demultiple field, some new challenges , such as the inverse scattering imaging and identification of the properties of the sub-surfaces and so on, have been aimed by this approach.The inverse scattering series method is a really effective way to remove the multiples. What's more, this method clues the bright future in the next study.