| 基于单程波偏移算子的地表相关多次波成像 |
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| 引用本文： | 叶月明,赵昌垒,庄锡进,郭书娟,钱进.基于单程波偏移算子的地表相关多次波成像[J].地球物理学报,2014,57(4):1241-1250. |
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| 作者姓名： | 叶月明 赵昌垒 庄锡进 郭书娟 钱进 |
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| 作者单位： | 1. 中国石油杭州地质研究院, 杭州 310023;2. 中国石化石油物探技术研究院, 南京 211103;3. 中国科学院海洋研究所, 青岛 266071 |
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| 基金项目： | 国家自然科学基金项目(41206043)资助 |
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| 摘 要： | 在常规地震资料处理中，多次反射波被视为噪声并从地震数据中去除，以免在之后的地震资料解释中造成误解.而事实上，多次波也是地震信号，是照明波场的一部分，能够对地下构造成像的精度做出贡献.本文分析了多次波在传统单程波叠前深度偏移中产生构造假象的机制和表现，为实现基于单程波偏移算子的多次波成像，修改了单程波叠前深度偏移的边界条件，即将输入的震源波场用包含多次波的记录来替代，输入的记录波场用预测出的表层相关多次波来替代，实现了基于单程波偏移算子的地表相关多次波成像，并从理论上给出了其成像依据.通过基于二范式最小能量差原则求取的匹配因子，将多次波成像结果与一次波成像结果进行匹配叠加，应用多次波成像来弥补一次波成像的不足.简单模型验证了基于单程波偏移算子的多次波成像方法的有效性，最后对Sigsbee2B模型进行了一次波与多次波联合成像试算，盐边界高陡构造成像质量得到了明显改善.
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| 关 键 词： | 单程波偏移 多次波成像 最小二乘匹配滤波 二范式 盐丘成像 |
| 收稿时间： | 2013-09-06 |
Migration of surface correlated multiples based on one-way wave equation |
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| YE Yue-Ming,ZHAO Chang-Lei,ZHUANG Xi-Jin,GUO Shu-Juan,QIAN Jin.Migration of surface correlated multiples based on one-way wave equation[J].Chinese Journal of Geophysics,2014,57(4):1241-1250. |
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| Authors: | YE Yue-Ming ZHAO Chang-Lei ZHUANG Xi-Jin GUO Shu-Juan QIAN Jin |
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| Institution: | 1. PetroChina Hangzhou Research Institute of Geology, Hangzhou 310023, China;2. Sinopec Geophysical Research Institute, Nanjing 211103, China;3. Institute of Oceanology Chinese Academy of Sciences, Qingdao 266071, China |
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| Abstract: | In conventional seismic data processing, multiple reflection waves are regarded as noise which should be removed from seismic data in order to avoid misunderstanding. In fact, multiples are also signals which contribute to part of subsurface structure illumination and imaging. In this paper, we analyzed the artifact generating mechanism and phenomenon caused by multiples in conventional one-way equation based pre-stack depth migration. In order to realize multiple imaging based on one-way wave equation, the boundary condition of one-way wave-equation based pre-stack depth migration was modified. It means that the input source wave field and recorded wave field are replaced by the record containing multiples and predicted surface correlated multiples, respectively. Then we stacked the pre-stack depth migration results from primaries and multiples based on the matching operator which is obtained from the norm II least-square energy difference methods. Imaging with multiples is a good compensation to imaging to that with primaries. The test on a simple model shows the validity of our method. Finally, jointed imaging with primaries and multiples was performed on the Sigsbee2B model. The results show that the imaging of the steep salt boundary was improved dramatically. |
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| Keywords: | One-wave equation based migration Multiples imaging Least-squares based filtering Norm II Salt imaging |
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