Compound events decomposition and the interaction between AVO and velocity information1
Compound events decomposition and the interaction between AVO and velocity information1
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DOI：
10.1111/j.1365-2478.1994.tb00208.x
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发表时间：
1994-04
影响因子：
2.6
通讯作者：
U. Spagnolini
中科院分区：
文献类型：
--
作者：
U. Spagnolini
地震残差的最小化不能保证模型的唯一性，这意味着反演中的模糊性。振幅与炮检距（AVO）反演不会导致单个弹性界面参数的唯一解，除非可以获得转换和S波或临界角反射。针对AVO反演的模糊性，讨论了AVO反演与速度估计的相互影响。确定了描述具有AVO特性和剩余速度误差的孤立反射所需的独立参数的数量。统计分析允许建立AVO和轻微的速度变化的影响的近似等效性;如果没有地质先验信息（运动学等效性），这种等效性就无法解决。然后，数据被分解为复合事件（即以固定时间滞后彼此跟随的N个接口的序列）。通过将分析结果从窄带外推到宽带数据来获得分解。复合同相轴分解表明，AVO反演不仅在物理参数空间（纵横波速度和密度）上模糊，而且在运动学上也模糊。作为复合事件分解的一个例子，导出了一个介质。这种介质在地质学上是难以置信的，但在运动学上是。作为复合事件分解的示例，导出了更多的介质。这种介质在地质学上是不可信的，但在运动学上是等效的。«少
Minimization of seismic residuals does not guarantee uniqueness of the model, and this implies ambiguities in the inversion. Amplitude vs. offset (AVO) inversion does not lead to a unique solution of single elastic interface parameters unless converted and S-wave or critical angle reflections are available. Given the ambiguity of AVO inversion, this paper discusses the interaction between AVO and velocity estimation. The number of independent parameters necessary to describe an isolated reflection with AVO behavior and residual velocity error is determined. Statistical analysis allows the establishment of an approximate equivalence of the effects of AVO and slight velocity variations; this equivalence cannot be solved without geological a priori information (kinematic equivalence). The data are then decomposed into compound events (i.e. sequences of N interfaces that follow each other at a fixed time lag). The decomposition is obtained by extrapolating the results of the analysis from narrowband to wideband data. Compound events decomposition demonstrates that AVO inversion is ambiguous, not only in the physical parameter space (P- and S-wave velocities, and density) but also kinematically. As an example of compound event decomposition, a medium is derived. This medium is geologically implausible but is kinematically. As an example of compound event decomposition,more » a medium is derived. This medium is geologically implausible but is kinematically equivalent.« less