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首页> 外文期刊>Journal of geophysics and engineering >Layer stripping of azimuthal anisotropy from P-wave reflection moveout in orthogonal survey lines
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Layer stripping of azimuthal anisotropy from P-wave reflection moveout in orthogonal survey lines

机译：正交测量线中P波反射运动的方位各向异性层剥离

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摘要

This paper presents a layer-stripping procedure to determine interval measurements of fracture parameters in multi-layered fractured media with vertically varying strike directions. The procedure is based on the P-wave travel time difference between two orthogonal seismic survey lines, and this difference is referred to as the P-wave azimuthal moveout response (AMR). The interval AMR of a fracture target for a fixed offset is a function of cos 2(α - φ_i) with respect to the line azimuth α and the fracture-strike azimuth φ_i. Consequently two pairs of orthogonal survey lines can be used to determine the local fracture strike φ_i if the interval AMR of the target is known. In the case of a weakly fractured overburden underlain by a fractured target, layer stripping can be achieved through the alignment of the top-target event by performing NMO correction separately for all survey lines. The interval AMR of the target layer may then be calculated from the residual moveout of the bottom-target event, if any. In the general case, a ray-tracing procedure, similar to that used in AVO analysis, is required to perform effective layer stripping. Full-wave modelling is used to verify and illustrate these procedures.
机译：本文提出了一种分层剥离程序，以确定在走向方向垂直变化的多层裂缝介质中裂缝参数的间隔测量值。该程序基于两条正交地震勘探线之间的P波传播时间差，该差称为P波方位角时差响应（AMR）。相对于线方位角α和断裂走向方位角φ_i，固定偏移位置的断裂目标的间隔AMR是cos 2（α-φ_i）的函数。因此，如果已知目标的间隔AMR，则可以使用两对正交的勘测线确定局部裂缝走向。在弱层覆盖层被破裂目标物覆盖的情况下，可以通过对所有测量线分别进行NMO校正，通过对准最高目标事件来实现层剥离。然后，可以从底部目标事件的剩余偏移量（如果有）中计算目标层的间隔AMR。在一般情况下，需要执行类似于AVO分析中所使用的光线追踪程序来执行有效的层剥离。全波建模用于验证和说明这些过程。

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