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    奇异的波至现象

    於文辉 张丽琴 王家映 周玉琦

    於文辉, 张丽琴, 王家映, 周玉琦, 2002. 奇异的波至现象. 地球科学, 27(5): 651-658.
    引用本文: 於文辉, 张丽琴, 王家映, 周玉琦, 2002. 奇异的波至现象. 地球科学, 27(5): 651-658.
    WU Wen-hui, ZHANG Li-qin, WANG Jia-ying, ZHOU Yu-qi, 2002. Strange Phenomena of Wave Arrival. Earth Science, 27(5): 651-658.
    Citation: WU Wen-hui, ZHANG Li-qin, WANG Jia-ying, ZHOU Yu-qi, 2002. Strange Phenomena of Wave Arrival. Earth Science, 27(5): 651-658.

    奇异的波至现象

    详细信息
    • 中图分类号: P315.3

    Strange Phenomena of Wave Arrival

    • 摘要: 1997年, 笔者在水力压裂后的砂岩产油井中进行高分辨率VSP工作时, 除观测到常规纵波及转换波外, 还观测到来自产油层的几种奇异的慢速波至.由于该慢速波至的性质不明, 按视速度从高到低分别命名为W1、W2、W3, … (W为wave的第1个字母).在顺5井裂隙优势方向, 12 10m深度上观测到5种反射波: 反射纵波、反射转换波、W1、W2、W3波; 在裂隙非优势方向上, W2、W3波没有出现.在顺4井15 3 2m深度上观测到4种反射波: 反射纵波、反射转换波, 还有2种慢速波至, 为了区别于顺5井中观测到的慢速波至, 将其命名为W4、W5波.结合该区钻井、测井、地面地震、井间地震等资料对观测到的慢速波至进行了详细分析, 分析结果表明: 该慢速波至既不属于不均匀介质产生的绕射波、侧界面产生的反射波、槽波、管波、斯通利波, 也与Biot慢纵波动力学特征相悖.现有波动理论不能解释这种慢速波至现象, 这意味着地球内部介质中存在人类还未认识的弹性波传播规律

       

    • 图  1  顺宁油田高分辨率VSP野外采集方案

      Fig.  1.  Field acquisition strategy of high resolution VSP in Shunning oil field

      图  2  伪测井初至波频谱分析曲线

      Fig.  2.  Curve of spectrum analysis about the pseudolog first break

      图  3  地震子波频谱曲线

      Fig.  3.  Curve of frequency spectrum of seismic wavelet

      图  4  顺6井零偏高分辨率VSP原始Z分量剖面(炮点S6)

      偏移距83.6 m, 深度点距4 m, 采样间隔0.25 ms

      Fig.  4.  Raw Z-component of the zero-offset high resolution VSP in Shun 6 Well (Source S6)

      图  5  顺5井有偏高分辨率VSP原始Z分量剖面

      a.炮点Sc: 偏移距1038.7 m, 深度点距4 m, 采样间隔0.25 ms; b.炮点S6: 偏移距927.9 m, 深度点距3 m, 采样间隔0.25 ms; c.炮点S4: 偏移距740 m, 深度点距4 m, 采样间隔0.25 ms

      Fig.  5.  Raw Z-component of the offset high resolution VSP in Shun 5 Well

      图  6  顺4井有偏高分辨率VSP原始Z分量剖面

      a.炮点Sc: 偏移距1179 m, 深度点距4 m, 采样间隔0.25 ms; b.炮点Ss: 偏移距586.6 m, 深度点距4 m, 采样间隔0.25 ms; c.炮点S5: 偏移距686.6 m, 深度点距4 m, 采样间隔0.25 ms

      Fig.  6.  Raw Z-omponent of the offset high resolution VSP in Shun 4 Well

      图  7  顺6井有偏高分辨率VSP原始Z分量剖面

      a.炮点Sc: 偏移距966.8 m, 深度点距4 m, 采样间隔0.25 ms: b.炮点S5: 偏移距857 m, 深度点距3 m, 采样间隔0.25 ms

      Fig.  7.  Raw Z-component of the offset high resolution VSP in Shun 6 Well

      图  8  W1波与1 210 m处直达纵波频谱对比曲线

      Fig.  8.  Comparison of frequency spectrum between W1 and direct wave at the depth of 1 210 m

      图  9  顺宁油田井间地震原始记录

      Fig.  9.  Raw cross-hole seismogram in Shunning oil field

      图  10  W1波能量随距离变化曲线(道间隔4 m)

      Fig.  10.  W1 energy curve versus distance

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    • 收稿日期:  2002-03-06
    • 刊出日期:  2002-09-25

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