基于奇异值分解的广义相似和多cmp走时参数估计

IF 2.1 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Anderson S. Santos , Bjorn Ursin , Michelângelo G. Silva , Milton J. Porsani
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引用次数: 0

摘要

这项工作介绍了一种使用多参数方程的新方法,具体应用于多cmp领域。我们的方法利用奇异值分解相似性,在第一个特征图像中捕获最相干的信号。通过类似于传统速度分析的分析,可以确定一组CMP族的二维叠加参数,包括横向CMP之间的速度和事件倾角。与CRS和CDS中采用的传统方法(如全局和局部优化策略)不同,我们的方法不需要初始速度模型或其他参数。CRS方法通常在2D中涉及三个参数,而CDS方法可能需要更多参数。相比之下,我们的方法侧重于速度和倾角等关键参数,在保持准确性的同时降低了复杂性。使用功率法可以在不牺牲叠加参数估计精度的情况下降低计算成本。该方法应用于不同噪声水平的合成数据和位于巴西被动边缘的Jequitinhonha和Camamu盆地的真实数据。结果成功地提高了信噪比,改善了反射器的连续性,证明了我们的方法的鲁棒性和实用性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Generalized semblance and multi-CMP traveltime parameter estimation using Singular Value Decomposition
This work introduces a novel approach using a multiparametric equation specifically applied within the multi-CMP domain. Our method leverages SVD semblance, capturing the most coherent signal in the first eigenimage. This enables the determination of 2D stacking parameters for a set of CMP families, including velocity and dip of events between lateral CMPs, through analysis akin to conventional velocity analysis. Unlike traditional methods employed in CRS and CDS, such as global and local optimization strategies, our approach does not require an initial velocity model or additional parameters. CRS methods typically involve three parameters in 2D, while CDS methods may require more. In contrast, our method focuses on key parameters like velocity and dip, reducing complexity while maintaining accuracy. The use of the power method results in a reduced computational cost without sacrificing precision in stacking parameter estimation. The method was applied to both synthetic data with varying noise levels and real data from the Jequitinhonha and Camamu Basins, located along the Brazilian passive margin. The results were successful in enhancing the signal-to-noise ratio and improving the continuity of reflectors, demonstrating the robustness and practical utility of our approach.
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来源期刊
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
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