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Horizon slices of bandwidth-extended seismic data: optimizing thin bed interpretation from spectral decomposition

机译：带宽扩展地震数据的地平线片：优化光谱分解的薄床解释

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摘要

Fourth-order sequences in the northern central Miocene Gulf of Mexico are typically at or below seismic resolution and embedded in deformed strata with lateral thickness variations, making it difficult to image the corresponding paleo-depositional surfaces. Stratal or proportional slicing, involving proportionally slicing between two bounding reference horizons, can overcome these difficulties. However, if the target horizon can be readily interpreted, its horizon slice can provide the most accurate image. In this study, we first improved the resolution of the seismic data from the northern central Gulf of Mexico by bandwidth extension. Then, we autotracked a Miocene fourth-order sequence (M4) through the 50-Hz isofrequency volume obtained by the generalized spectral decomposition of the bandwidth-exteneded data. The horizon slice along M4 through the bandwidth-extended data provides a better image for incised-fluvial valleys and distributary channels compared with the stratal slice of the original data reported by earlier work. The corendered image of the variance and amplitude horizon slices further highlights the depositional features of M4. The horizon slice of M4 through the acoustic impedance volume, computed from inversion, shows that the incised-fluvial-valley fill is characterized by low impedance, suggesting good reservoir quality and that the distributary-channel fill is characterized by low to moderate impedance, suggesting fair to good reservoir quality. The definition of the horizon slice includes both the slice along the target horizon and those parallel to the reference horizon. We propose to call the slice along the target horizon a "horizon slice" and to use the term "horizon-parallel slices" for any slices parallel to an interpreted horizon.
机译：墨西哥中部中部南部海湾湾的四阶序列通常在地震分辨率下或嵌入横向厚度变化的变形地层处，使得难以将相应的古沉积表面进行成像。梯形或比例切片，涉及在两个边界参考视野之间按比例切割，可以克服这些困难。但是，如果目标地平线可以容易地解释，其地平线切片可以提供最准确的图像。在这项研究中，我们首先通过带宽延伸改进了来自墨西哥北部的地震数据的解决。然后，我们通过通过带宽伸出的数据的广义频谱分解获得的50 Hz型成像体积自动攻击了内序四阶序列（M4）。通过带宽扩展数据沿M4的地平线切片为切割 - 河流谷和分配通道提供了更好的图像，与早期工作报告的原始数据的划分部分相比。方差和幅度地平线切片的迫切形象进一步突出了M4的沉积特征。通过反转计算的声阻体的地平线切片，表明，切割的氟谷填充的特点是低阻抗，暗示良好的水库质量，并且分销通道填充的特点是低至中度阻抗，暗示公平到良好的水库质量。地平线切片的定义包括沿着目标地平线的切片和与参考范围平行的切片。我们建议沿着目标地平线调用切片“地平线切片”，并使用与解释的地平线平行的任何切片的术语“平行片”。

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