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Controlled-source interferometric redatuming by crosscorrelation and multidimensional deconvolution in elastic media

机译:弹性介质中互相关和多维解卷积的受控源干涉仪重新标定

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摘要

Various researchers have shown that accurate redatuming of controlled seismic sources to downhole receiver locations can be achieved without requiring a velocity model. By placing receivers in a horizontal or deviated well and turning them into virtual sources, accurate images can be obtained even below a complex near-subsurface. Examples include controlled-source interferometry and the virtual-source method, both based on crosscorrelated signals at two downhole receiver locations, stacked over source locations at the surface. Because the required redatuming operators are taken directly from the data, even multiple scattered waveforms can be focused at the virtual-source location, and accurate redatuming can be achieved. To reach such precision in a solid earth, representations for elastic wave propagation that require multicomponent sources and receivers must be implemented. Wavefield decomposition prior to crosscorrelation allows us to enforce virtual sources to radiate only downward or only upward. Virtual-source focusing and undesired multiples from the overburden can be diagnosed with the interferometric point-spread function (PSF), which can be obtained directly from the data if an array of subsurface receivers is deployed. The quality of retrieved responses can be improved by filtering with the inverse of the PSF, a methodology referred to as multidimensional deconvolution.
机译:各种研究人员表明,无需速度模型,就可以将受控地震源准确地重新分配到井下接收器位置。通过将接收器放置在水平或偏斜的井中并将其转换为虚拟源,甚至可以在复杂的近地下以下获得准确的图像。示例包括受控源干涉测量法和虚拟源方法,这两种方法都基于两个井下接收器位置处的互相关信号,并叠加在地表的源位置上。由于所需的重新计算运算符直接从数据中获取,因此即使多个分散的波形也可以集中在虚拟源位置,并且可以实现准确的重新计算。为了在固体土壤中达到这样的精度,必须实现需要多分量源和接收器的弹性波传播的表示。互相关之前的波场分解使我们能够强制虚拟源仅向下或向上辐射。可以通过干涉点扩展功能(PSF)来诊断虚拟源聚焦和上覆层的不良倍数,如果部署了地下接收器阵列,则可以直接从数据中获取。可以通过使用PSF的逆进行滤波(称为多维反卷积的方法)来提高检索到的响应的质量。

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