| 共转换点道集S变换谱相似性的多波地震数据横波波场提取技术 |
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| 引用本文： | 黄德智,韩立国,杨飞龙,李辉峰,苑强,孙楠,杨文平.共转换点道集S变换谱相似性的多波地震数据横波波场提取技术[J].地球物理学报,2021,64(4):1351-1363. |
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| 作者姓名： | 黄德智 韩立国 杨飞龙 李辉峰 苑强 孙楠 杨文平 |
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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;西安石油大学地球科学与工程学院,西安 710065;中石化石油工程地球物理有限公司华北分公司,郑州 450000;中国石化东北油气分公司勘探开发研究院,长春 130062 |
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| 基金项目： | 陕西省自然科学基金项目"基于自适应反射点加密的三维井间地震逆高斯束叠加成像";国家自然科学基金面上项目"基于机器学习的主动源与被动源地震数据融合与直接建模研究" |
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| 摘 要： | 横波速度动校正后的共转换点(CCP)道集内,同时刻的各道横波信号S变换(ST)谱与其叠加道ST谱具有相似关系.因此,可基于这种相似关系设计自适应滤波器来提取多波地震数据中的横波波场.首先对共中心点(CMP)道集应用纵波速度动校正并在各道减去叠加道来去除数据中的纵波波场;然后在CCP道集应用横波速度动校正,将地震道振幅水平调整至叠加道振幅水平并做S变换,以叠加道ST谱为参考对地震道ST谱进行自适应滤波,去除数据中的残余纵波和噪声;最后,将滤波结果的振幅水平恢复至滤波前振幅水平.理论和实际数据试算表明,本文方法可有效提取多波地震数据中的横波波场,为多波多分量横波数据处理提供新思路.
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| 关 键 词： | 横波提取 叠加道 S变换谱 自适应滤波器 |
S-wave field extraction of multi-wave seismic data based on S-transform spectral similarity of common conversion point gathers |
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| HUANG DeZhi,HAN LiGuo,YANG FeiLong,LI HuiFeng,YUAN Qiang,SUN Nan,YANG WenPing.S-wave field extraction of multi-wave seismic data based on S-transform spectral similarity of common conversion point gathers[J].Chinese Journal of Geophysics,2021,64(4):1351-1363. |
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| Authors: | HUANG DeZhi HAN LiGuo YANG FeiLong LI HuiFeng YUAN Qiang SUN Nan YANG WenPing |
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| Institution: | (College of Exploration Technology,Jilin University,Changchun 130026,China;College of the Geoscience and Engineering,Xi′an Shiyou University,Xi′an 710065,China;North China Branch of Sinopec Geophysical Corporation,Zhengzhou 450000,China;Oil and Gas Exploration and Development Research Institute of Northeast Oil and Gas,Changchun 130062,China) |
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| Abstract: | The S-transform(ST)spectrum of S-wave in each common conversion point(CCP)gathers after normal moveout(NMO)correction by S-wave velocity is similar to the stack trace′s at the same time.Therefore,the S-wave fields can be extracted from multi-wave seismic data by an adaptive filter which is designed based on the similarity relationship.First of all,in order to remove the P-wave field in the data,the P-wave velocity NMO correction is applied to common middle point(CMP)gather data and the stack trace is subtracted from each trace.Secondly,the S transform of NMO CCP gather is calculated after adjusting the amplitude level of each trace to the level of stack trace,and the residual P-wave field and noise are removed by filtering the ST spectrum of seismic trace with ST spectrum of stack trace as reference adaptively.Finally,the amplitude level of filtering result is recovered to the amplitude level before filtering.Theoretical and practical data tests show that the proposed method can effectively extract the S-wave field in multi-wave seismic data,which provides a new idea for multi-wave and multi-component S-wave data processing. |
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| Keywords: | S-wave extraction Stack trace S-transform spectrum Adaptive filter |
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