面向目标的起伏地表组合震源延时参数计算方法

秦龙, 尹成, 崔永福, 刘正文, 张振, 方兵, 陶正武. 2019. 面向目标的起伏地表组合震源延时参数计算方法. 地球物理学报, 62(4): 1492-1501, doi: 10.6038/cjg2019L0306
引用本文: 秦龙, 尹成, 崔永福, 刘正文, 张振, 方兵, 陶正武. 2019. 面向目标的起伏地表组合震源延时参数计算方法. 地球物理学报, 62(4): 1492-1501, doi: 10.6038/cjg2019L0306
QIN Long, YIN Cheng, CUI YongFu, LIU ZhengWen, ZHANG Zhen, FANG Bing, TAO ZhengWu. 2019. A calculation method of delay explosion time of a source array on an undulating surface. Chinese Journal of Geophysics (in Chinese), 62(4): 1492-1501, doi: 10.6038/cjg2019L0306
Citation: QIN Long, YIN Cheng, CUI YongFu, LIU ZhengWen, ZHANG Zhen, FANG Bing, TAO ZhengWu. 2019. A calculation method of delay explosion time of a source array on an undulating surface. Chinese Journal of Geophysics (in Chinese), 62(4): 1492-1501, doi: 10.6038/cjg2019L0306

面向目标的起伏地表组合震源延时参数计算方法

  • 基金项目:

    2018E-1807-复杂山地、黄土塬及大沙漠区地震关键技术研究与应用(22161G20607)项目资助

详细信息
    作者简介:

    秦龙, 男, 1990年生, 2016年硕士毕业于西南石油大学, 现就职于中国石油塔里木油田分公司, 主要从事地震资料采集和处理方面的研究工作.E-mail:280794054@qq.com

  • 中图分类号: P631

A calculation method of delay explosion time of a source array on an undulating surface

  • 组合震源技术通过调节延迟激发时间和震源埋藏深度能够实现地震波场的定向传播,提高地震波的照明能量和地震数据信噪比.然而,目前国内外对基于特定目标的组合震源最佳聚焦方向的选取以及起伏地表组合震源定向理论的研究相对较少.在聚焦方向选取方面,目前基本是利用多种不同延时参数的组合震源分别进行试验,从而确定较好的组合震源延时参数.本文则利用爆炸反射面原理,在目的层界面上均匀布置震源同时激发地震波,能够产生垂直于地层界面传播的平面波,当初至波传播至地表时进行地表方向统计.根据互易性原理,以初至波传播方向的反方向为聚焦方向,激发产生的地震波主波束方向将垂直入射到目的层界面上,从而精确的计算出组合震源的最佳聚焦方向.在组合震源定向方面,目前主要是利用组合震源方向因子公式进行计算,但该方法要求震源布置在同一条直线上,并不能满足起伏地表的应用要求.本文以惠更斯-菲涅尔原理为理论基础,提出通过炮点向量在聚焦方向上的投影来确定组合震源传播至虚拟波前的走时,从而确定任意起伏地表组合震源的延迟激发时间.该方法不仅能够计算出沿给定地质模型的目的层界面垂直入射的组合震源聚焦方向,也能够确定任意起伏地表情况下形成沿该聚焦方向定向传播地震波场的组合震源延迟激发时间.因此,本文提出的面向目标的起伏地表组合震源延时参数计算方法对组合震源数据采集具有理论与实践意义.

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  • 图 1 

    地表方向统计示意图

    Figure 1. 

    Diagrammatic diagram of the surface direction statistic

    图 2 

    起伏地表组合震源激发示意图

    Figure 2. 

    Diagrammatic diagram of the source array explosion with undulating surface

    图 3 

    起伏地表模型

    Figure 3. 

    Undulating model

    图 4 

    地表方向统计结果

    Figure 4. 

    The result of surface direction statistic

    图 5 

    组合震源225 ms时的波场快照

    Figure 5. 

    The snapshot of source array at 225 ms

    图 6 

    多炮照明结果

    Figure 6. 

    The result of multiple sources illumination

    图 7 

    SEG起伏地表模型

    Figure 7. 

    The SEG undulating surface model

    图 8 

    地表方向统计结果

    Figure 8. 

    The result of surface direction statistic

    图 9 

    地震照明分析

    Figure 9. 

    Seismic illumination analysis

    图 10 

    目的层照明曲线

    Figure 10. 

    The illumination curve on the target layer

    表 1 

    组合震源位置及延时参数表

    Table 1. 

    The coordinates and delay explosion time of source array

    炮点序号 第一个组合震源 第二个组合震源 第三个组合震源
    位置坐标(m) 延迟时间(ms) 位置坐标(m) 延迟时间(ms) 位置坐标(m) 延迟时间(ms)
    1 (290, 58) 0 (380, 96) 5.92 (570, 90) 0
    2 (300, 52) 3.19 (390, 104) 2.88 (580, 80) 3.29
    3 (310, 48) 5.60 (400, 110) 0.64 (590, 68) 6.58
    4 (320, 46) 7.22 (410, 112) 0 (600, 56) 10.66
    5 (330, 48) 7.29 (420, 112) 0.16 (610, 44) 14.74
    6 (340, 56) 5.00 (430, 108) 1.92 (620, 34) 18.03
    7 (350, 64) 2.72 (440, 104) 3.68 (630, 28) 19.74
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出版历程
收稿日期:  2017-05-13
修回日期:  2019-02-18
上线日期:  2019-04-05

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