| 最小二乘Kirchhoff射线束叠前时间偏移 |
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| 引用本文： | 刘俊成,陈祥忠,郭井学,王瑞星,惠梦琳,黄申硕.最小二乘Kirchhoff射线束叠前时间偏移[J].地球物理学报,2021,64(5):1690-1698. |
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| 作者姓名： | 刘俊成 陈祥忠 郭井学 王瑞星 惠梦琳 黄申硕 |
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| 作者单位： | 吉林大学地球探测科学与技术学院,长春130026;北京桔灯地球物理勘探股份有限公司,北京 102200;中国极地研究中心,上海200129 |
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| 基金项目： | 国家重点研发计划课题(2020YFE0201300);国家自然科学基金(42034382)联合资助. |
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| 摘 要： | 最小二乘偏移可以消除非规则采集、带限子波等因素对偏移结果的不利影响,提高成像剖面的分辨率和照明度,但巨大的计算成本严重制约了该方法的应用前景.本文基于地震数据的局部平面波合成/分解策略,对传统Kirchhoff时间正演/偏移的计算过程进行改进,发展了一种快速的最小二乘Kirchhoff射线束叠前时间偏移方法.同需要逐道数据映射运算的常规最小二乘Kirchhoff叠前时间偏移相比,本文方法不但具备相当的成像精度和反演收敛速度,同时由于数据的正/反向映射运算只需在稀疏的射线束中心位置进行,因此计算效率得到了大幅度的提升.文中给出的模型和实际数据算例证明了本方法的正确性和有效性.
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| 关 键 词： | 最小二乘偏移 局部平面波 时间偏移 |
Prestack time migration based on the least-squares Kirchhoff beam |
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| LIU JunCheng,CHEN XiangZhong,GUO JingXue,WANG RuiXing,HUI MengLin,HUANG ShenShuo.Prestack time migration based on the least-squares Kirchhoff beam[J].Chinese Journal of Geophysics,2021,64(5):1690-1698. |
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| Authors: | LIU JunCheng CHEN XiangZhong GUO JingXue WANG RuiXing HUI MengLin HUANG ShenShuo |
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| Institution: | (Institute of Earth Exploration Science and Technology,Jilin University,Changchun 130026,China;Beijing Orangelamp Geophysical Exploration Company Limited,Beijing 102200,China;Polar Research Institute of China,Shanghai 200129,China) |
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| Abstract: | Least-Squares Migration(LSM)can eliminate the adverse effects of irregular acquisition,band-limited source wavelets and other factors on seismic imaging,and improve the resolution and illumination of imaging sections.However,the huge calculation cost of this method seriously restricts its popularization and application.To solve this problem,based on the beam synthesis/decomposition strategy of seismic data,this work improves and optimizes the calculation process of Kirchhoff forward modeling/migration,and develops an efficient prestack time migration method based on the least-squares Kirchhoff beam.Compared with the conventional least-squares Kirchhoff prestack time migration,which needs trace by trace data mapping,the proposed method not only has a comparable imaging accuracy and convergence rate,but also has greatly improved the computational efficiency because the data mapping operation only needs to be carried out in the sparse beam center.Tests on synthetic and the real data verify the correctness and effectiveness of the proposed method. |
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| Keywords: | Least-Squares Migration(LSM) Local plane-waves Time migration |
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