Elastic Impedance Parameters Extraction Based on Accumulation Method
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摘要: 弹性阻抗中蕴含着丰富的地下介质信息。从弹性阻抗中准确地提取地下介质信息用于储层预测是十分有意义的,传统的提取方法主要基于最小二乘理论的线性方法。本文引入累积法理论,将其用于弹性阻抗参数的提取,用层状模型和部分Marmousi2模型对该方法进行测试。从背景噪声分别为正态分布和均匀分布的弹性阻抗体中提取纵、横波速度和密度,并将其与最小二乘法提取的纵、横波速度和密度做定量对比分析。结果表明两种方法所得结果精度相当,但累积法具有计算量小、简洁直观的优势,因此,将其用于弹性参数的提取是有效可行的。Abstract: It's significant to extract underground media information for reservoir prediction from elastic impedance. While traditional extraction methods are mostly based on least squares theory, in this paper accumulation method is brought in to extract parameters from elastic impedance. Both methods are applied on a four-layer model and part of Marmousi 2 model to extract P-wave velocity, S-wave velocity and density from elastic impedance which contains Gaussian distribution background noise and uniform distribution background noise respectively. According to the quantitative comparison, the accuracy of the two methods ale approximate. Conclusion can be drawn that accumulation method is feasible and effective to extract parameters from elastic impedance.
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