| 黏弹性叠前时间偏移:陡倾角构造成像与实际应用 |
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| 引用本文： | 刘伟,张剑锋.黏弹性叠前时间偏移:陡倾角构造成像与实际应用[J].地球物理学报,2018,61(2):707-715. |
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| 作者姓名： | 刘伟 张剑锋 |
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| 作者单位： | 1. 中国科学院地质与地球物理研究所, 中国科学院油气资源研究重点实验室, 北京 100029;2. 中国科学院大学, 北京 100049 |
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| 基金项目： | 国家自然科学基金重点项目（41330316）和国家科技重大专项（2017ZX05008-007）资助. |
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| 摘 要： | 黏弹性叠前时间偏移通过在偏移过程中补偿地球介质的吸收衰减，恢复被衰减的高频成分，进而获得较常规叠前时间偏移更高分辨率的偏移成像结果.相比于常规叠前时间偏移，该方法实现环节包含的频率域积分产生的巨大计算量，需要基于GPU加速实现才能满足工业应用对其计算效率的需求.本文针对黏弹性叠前时间偏移算法实现的这一特点，提出了修正其走时计算方法精度和应用分时段的频率域成像策略，在进一步提升计算效率的同时，改进了该方法对陡倾角构造和断层的成像效果.我们将改进的黏弹性叠前时间偏移方法应用于三维陆上地震资料，与现行的商业偏移软件对比表明，该方法不仅获得了更高分辨率的成像结果，也实现了对断层和陡倾角构造的清晰成像，而新方法的计算耗时也较改进前减少了三分之一以上.
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| 关 键 词： | 黏弹性 叠前时间偏移 陡倾角 走时 计算效率 |
| 收稿时间： | 2017-02-13 |
De-absorption prestack time migration: steep dip structure imaging and its application |
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| LIU Wei,ZHANG JianFeng.De-absorption prestack time migration: steep dip structure imaging and its application[J].Chinese Journal of Geophysics,2018,61(2):707-715. |
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| Authors: | LIU Wei ZHANG JianFeng |
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| Institution: | 1. Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | De-absorption pre-stack time migration (PSTM) can compensate absorption and dispersion via an actual wave propagation path using effective Q parameters. Compared with conventional pre-stack time migration, it has higher resolution image. In this paper, we modified the conventional travel time method to a high order one by introducing two non-dimensional parameters. These parameters are obtained by optimizing the travel time equation and the travel time calculated using the Snell's law. To improve the robustness of imaging steep-dip structure and faults, we present a new travel time calculation method useful for graphic process unit (GPU) and a seismic trace split method. Applying the method to the real 3D land seismic data produces significant improvements in resolution especially in steep-dip structure and faults. At the same time, the improved method can reduce the calculation time by more than one third. |
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| Keywords: | Viscoelastic media Pre-stack time migration Steep dip structure Travel time GPU speed up |
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