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首页> 外文期刊>Journal of Applied Geophysics >Scaling behavior and the effects of heterogeneity on shallow seismic imaging of mineral deposits: A case study from Brunswick No. 6 mining area, Canada
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Scaling behavior and the effects of heterogeneity on shallow seismic imaging of mineral deposits: A case study from Brunswick No. 6 mining area, Canada

机译：标度行为和非均质性对矿床浅层地震成像的影响：以加拿大不伦瑞克6号矿区为例

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摘要

We have studied the scaling behavior of compressional-wave velocity and density logs from an exploration borehole that extends down to about 700. m depth in the Brunswick No. 6 mining area, Bathurst Mining Camp, Canada. Using statistical methods, vertical and horizontal scale lengths of heterogeneity were estimated. Vertical scale length estimates from the velocity, density and calculated acoustic impedance are 14. m, 33. m, and about 20. m, respectively. Although the estimated scale length for the acoustic impedance implies a weak scattering environment, elastic finite difference modeling of seismic wave propagation in 2D heterogeneous media demonstrates that even this weak scattering medium can mask seismic signals from small, but yet economically feasible, massive sulfide deposits. Further analysis of the synthetic seismic data suggests that in the presence of heterogeneity, lenticular-shaped targets may only exhibit incomplete diffraction signals whereby the down-dip tails of these diffractions are mainly visible on the stacked sections. Therefore, identification of orebody generated diffractions is much easier on the unmigrated stacked sections than on migrated stacked sections. The numerical seismic modeling in 2D heterogeneous media indicates that in the presence of large horizontal, but small vertical scale lengths (structural anisotropy), identification of massive sulfide deposits is possible, but their delineation at depth requires detailed velocity modeling and processing algorithms which can handle the anisotropy.
机译：在加拿大巴瑟斯特采矿营地的不伦瑞克6号矿区，探井延伸至700.m深度，研究了压缩波速度和密度测井的标度行为。使用统计方法，估计了异质性的垂直和水平尺度长度。根据速度，密度和计算出的声阻抗，垂直标尺长度估计分别为14. m，33。m和约20. m。尽管估计的声阻抗标度长度暗示了弱散射环境，但是在二维异质介质中传播的地震波的弹性有限差分模型表明，即使这种弱散射介质也可以掩盖来自小但经济可行的块状硫化物矿床的地震信号。对合成地震数据的进一步分析表明，在存在非均质性的情况下，双凸透镜状的目标可能仅显示不完整的衍射信号，因此这些衍射的向下倾斜的尾部主要在叠层上可见。因此，在未迁移的叠层上比在迁移的叠层上鉴定矿体产生的衍射要容易得多。在二维非均质介质中的数值地震建模表明，在水平方向大但垂直尺度长度小（结构各向异性）的情况下，可以识别块状硫化物矿床，但要在深度上划定界线，则需要详细的速度模型和处理算法，以便能够处理各向异性。

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