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首页> 外文期刊>Surveys in Geophysics: An International Review Journal of Geophysics and Planetary Sciences >Seismic Frequency Component Inversion for Elastic Parameters and Maximum Inverse Quality Factor Driven by Attenuating Rock Physics Models
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Seismic Frequency Component Inversion for Elastic Parameters and Maximum Inverse Quality Factor Driven by Attenuating Rock Physics Models

机译：弹性参数的地震频率分量反转和衰减岩石物理模型驱动的最大逆质量因子

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摘要

Attenuation exists in seismic wave propagation in subsurface layers, and relatively high attenuation occurs in oil-bearing reservoirs. Inversion of frequency components of observed seismic data generates values of attenuation factor 1/Q, which produces potential results for determining oil-bearing reservoirs. Beginning with expressions of seismic wave velocity in attenuating media, we involve P-wave maximum attenuation factor to rewrite P-wave velocity driven by an attenuating rock physics model, and we also employ an empirical relationship between P-wave attenuation factor and S-wave attenuation factor to express S-wave velocity in terms of P-wave maximum attenuation factor. Using the derived P- and S-wave velocities, we extend Zoeppritz equations to compute reflection coefficient for an interface separating two attenuating media. Under the assumption that contrasts in elastic properties of two media across the interface are small and the background attenuation is weak, we propose a linearized reflection coefficient of PP-wave as a function of contrasts in elastic parameters (i.e., P-wave velocity, S-wave velocity and density) and attenuation factor, and expression of elastic impedance (EI) is also presented. Based on the EI, we demonstrate an approach of estimating elastic parameters and attenuation factor from frequency components of partially incidence-stacked seismic data, which is implemented as a two-step inversion involving the prediction of EI datasets using a model-based damping least-squares algorithm and nonlinear inversion for elastic parameters and attenuation factor. Noisy synthetic seismic data generated using the extended Zoeppritz equations are employed to verify the robustness and stability of the proposed inversion approach. Applying the proposed approach to a real dataset acquired over an oil-bearing reservoir, we obtain convincing results of P-wave velocity, S-wave velocity, density and attenuation factor, which can reasonably match corresponding well log data.
机译：衰减存在于地下层的地震波传播中，并且在含油储存器中发生相对高的衰减。观察到地震数据的频率分量的反转产生衰减因子1 / Q的值，其产生用于确定储油储存器的潜在结果。从衰减介质中的地震波速度的表达开始，我们涉及P波最大衰减因子以重写由衰减岩石物理模型驱动的P波速度，并且我们还采用了P波衰减因子和S波之间的经验关系在P波最大衰减因子方面表达S波速度的衰减因子。使用衍生的P和S波速度，我们扩展了Zoeppritz方程以计算分离两个衰减介质的接口的反射系数。在界面两种媒体的弹性特性对比的假设下，较小并且背景衰减较弱，我们提出了PP波的线性化反射系数作为弹性参数中对比的函数（即，P波速度，S还介绍了速度和密度）和衰减因子，以及弹性阻抗（EI）的表达。基于EI，我们展示了估计部分入射堆叠地震数据的频率分量的弹性参数和衰减因子的方法，其实现为使用基于模型的阻尼最少的模型的阻尼预测EI数据集的两步反演 - 弹性参数和衰减因子的方块算法与非线性反演。使用使用扩展Zoeppritz方程产生的嘈杂的合成地震数据来验证所提出的反转方法的鲁棒性和稳定性。将所提出的方法应用于通过储油储存器获取的真实数据集，我们获得了P波速度，S波速度，密度和衰减因子的令人信服的结果，这可以合理地匹配相应的井日志数据。

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