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当地震波转换的影响不能被.怒略时,不能做地震偏移的声波近似法,这种情况经常发生在大炮检距的数据处理中.因此地震偏移能够理想地建立在全弹性波动方程的基础上,这种全弹性波动方程既描述了在闻体介质中的压缩波,也描述了剪切波(例如岩石层中的剪切应力可能起到重妥作用).为了解决那些波型之间的转换问题,全弹性波动方程可以根据质点的速度和引力衣示,这是因为跨过地层边界的场强是连续的,在这些地层边界是波主要发生相互干涉的地方.所以全弹性波动方程应该由一个拒阵微分方程未表达.微分方程中的一个矩阵算符代表一个既包括速度又包括质点引力的全波矢量.这个方程的解还产生另外一个矩阵算符.这个全弹性双程波场汁推其符描述了在两个不同深度面的全部(双程)波场之间的关系(利用了质点速度和引力).所以它可以用在迭前偏移进行地表面数据外延递归到下界面(在一个“无引力”的地表面上,全部波场可由记录到的质点速度和源的引力来描述).对一个平一下界面构造的合成数据结果表明,一个下界面的单一成像是能够得到的,因此依赖于角度的尸一尸和P一S扩反射函数变为独宾的了. 时更复杂的界面构造,全弹性偏移在原则上是可行的,但是便得计并变得更复杂.特别在三维情况下,与其它全弹性偏移或反演方法比较,我们的方法已大大改进了全弹性偏移的可能性,因为我们的方法是按每个炮点的记录和每个频率的分量进行的.
When the impact of local seismic wave transformation can not be neglected, the acoustic wave approximation method of seismic offset can not be used, and this situation often occurs in the data processing of offset detection. Therefore, the seismic migration can be ideally established in the full elastic wave equation Based on this, the fully elastic wave equation describes both the compressional waves in the stencil medium and the shear waves (for example, the shear stress in the rock layer may play a role). To solve these wave patterns The problem of the transition between all elastic wave equations can be expressed in terms of particle velocity and gravitational force because the field strength across the boundary of the formation is continuous and where the boundary of the formation is the place where the waves interfere mainly with each other. The equations should not be expressed by a reflexive differential equation. A matrix operator in a differential equation represents a full-wave vector that includes both velocity and gravitation. The solution to this equation yields another matrix operator. This fully elastic two-way The wave-field push-push descriptor describes the relationship between the full (two-way) wavefield at two different depths (using particle velocity and gravitation), so it can be used with pre-migration The surface data is recursively extended to the lower interface (on a “unprimed ” surface, the entire wavefield can be described by the particle velocity and source gravitation recorded.) The result of a flattened interface constructed from synthetic data shows that, A single imaging of the lower interface is obtainable, so the angle-dependent corpse and P-S diffuse functions become unique. For more complex interface configurations, full elastic migration is in principle feasible , It becomes more complicated and complicated.Our method, in particular in the three-dimensional case, has considerably improved the possibility of full elastic deflection compared to other methods of full elastic migration or inversion, since our method is to press The recording of each shot and the components of each frequency are made.