相位匹配技术及其在压制OBN地震鸣震中的应用

doi:10.11720/wtyht.2019.0007

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摘要

通过对比海底节点(OBN)地震水检数据(P)和陆检数据(Z)的相位差,将相似系数准则改进并引入到OBN水陆检数据相位匹配中,从而消除两种检波器数据的相位差异;在频率匹配的基础上,用匹配滤波方法对陆检数据进行振幅匹配,之后进行双检数据PZ合并以压制海底鸣震。经理论模型测试和实际资料处理,表明改进的相似系数法可以快速、准确地校正陆检数据的相位差,PZ合并压制鸣震取得了较好的效果。

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	陶建
	李斌
	周夏婉

关键词 ：海底节点地震(OBN), 水陆检数据, 相位匹配, 鸣震压制

Abstract：

By comparing the phase difference between OBN hydrophone data (P) and geophone data (Z),the similarity coefficient criterion is improved and introduced into the phase matching of OBN data,so as to eliminate the phase difference between the two geophones data.On the basis of frequency matching,the amplitude matching of geophone data is carried out by matching filtering method,and then the dual-sensor data PZ are merged to suppress the reverberation.The theoretical model test and actual data processing show that the improved similarity coefficient method can correct the phase difference of land geophone data quickly and accurately,and the PZ combination has achieved good results in suppressing the reverberation.

Key words： ocean bottom nodes seismics hydrophone and geophone phase matching reverberation suppression

收稿日期: 2019-01-03 出版日期: 2019-04-10

P631.4

基金资助:国家自然科学基金项目(41874123);中央高校基金科研业务费专项资金(300102268401)

作者简介: 陶建(1993-),硕士研究生,主要从事海洋地震信号处理方向的研究工作。Email: 1013320954@qq.com

引用本文:

陶建, 李斌, 周夏婉. 相位匹配技术及其在压制OBN地震鸣震中的应用[J]. 物探与化探, 2019, 43(2): 380-385.
Jian TAO, Bin LI, Xia-Wan ZHOU. Phase matching technology and its application in suppressing OBN reverberation. Geophysical and Geochemical Exploration, 2019, 43(2): 380-385.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2019.0007 或 https://www.wutanyuhuatan.com/CN/Y2019/V43/I2/380

Fig.1 海底节点地震理论模型

Fig.2 用于合成地震记录的地震子波
a—零相位子波;b—混合相位子波

Fig.3 由OBN理论模型模拟的双检波器相位匹配校正实验(第201道记录)
a—零相位子波模型相位校正前;b—零相位子波模型相位校正后;c—混合相位子波模型相位校正前;d—混合相位子波模型相位校正后

Fig.4 OBN共检波点道集上不同地震道双检波器相位校正前后对比
a—第100道;b—第250道

Fig.5 共检波点道集陆检数据相位校正角

Fig.6 陆检匹配前后对比
a—水检记录;b—陆检记录;c—陆检匹配结果

Fig.7 水陆检某一道压制鸣震效果对比

Fig.8 水陆检合并叠加数据频谱对比

Fig.9 实际共检波点数据压制鸣震效果对比
a—压制鸣震前水检记录;b—压制鸣震后水陆检合并记录

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