海水层对地震反射特征的影响研究

doi:10.11720/wtyht.2023.1366

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摘要

在海洋地震勘探中,地震反射特征对于AVO分析、海底参数反演以及构造分析等具有重要作用。地震波在海洋中传播,其产生的地震反射特征受到海水层和海底以下沉积物的综合影响,但目前业界主要针对海底以下沉积物对地震反射特征的影响开展研究,关于海水层对地震反射特征影响的研究较少。本文主要研究地震波在海水层中传播时地震波场的变化特征,首先从流体—固体分界面和自由界面的边界条件出发,推导出弹性界面入射和反射时的P-P振幅比,得到海水层效应的数学表达式。然后分析入射波频率、海水层深度、海底阻抗差和入射角等因素对海水层滤波效应的影响,分析结果表明:海水层对于地震P波具有周期性的选频滤波效应;选频滤波效应的周期与入射波频率和海水层深度成反比,与入射角成正比;入射角越大,地震P波衰减越严重;阻抗差对振幅的影响与入射波频率和海水层深度有关。最后利用数值模拟验证了海水层对地震反射特征的影响。

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	杜燚镜
	孙成禹
	王志农
	蔡瑞乾
	王升荣
	焦峻峰

关键词 ：海水层, 地震反射特征, P-P波反射系数, 选频滤波

Abstract：

In marine seismic exploration,seismic reflection characteristics play an important role in AVO analysis,inversion for seabed parameters,and structural analysis.When seismic waves propagate in the ocean,their seismic reflection characteristics are affected by the seawater layer and the sediments beneath the seabed.However,previous studies mainly focus on the influence of the sediments beneath the seabed,while there is a lack of studies on the effects of the seawater layer on the seismic reflection characteristics.This study analyzed the changes in the seismic wave field during the seismic wave propagation in the seawater layer.Based on the boundary conditions of fluid-solid and free interfaces,this study derived the P-P amplitude ratio between the incident and reflected waves on an elastic interface and obtained the mathematical expression of the seawater layer effect accordingly.Then,this study analyzed the influencing factors,such as the frequency of incident waves,the depth of the seawater layer,the impedance contrast of the seabed,and the incident angle,on the filtering effect of the seawater layer.The analysis results are as follows:The seawater layer had a periodic frequency selective filtering effect on seismic P-waves;The period of the frequency selective filtering effect was inversely proportional to the frequency of incident waves and the depth of the seawater layer and was directly proportional to the incident angle;A higher incident angle corresponded to severer attenuation of seismic P-waves;The effects of impedance contrast on amplitude was related to the frequency of incident waves and the depth of the seawater layer.Finally,the study verified the effects of the seawater layer on seismic reflection characteristics through numerical simulations.

Key words： seawater layer seismic reflection characteristics P-P wave reflection coefficient frequency selective filtering

收稿日期: 2022-08-02 修回日期: 2023-02-13 出版日期: 2023-06-20

ZTFLH:

P631.4

基金资助:国家自然科学基金项目“基于石油勘探面波与P—导波的近地表纵横波速度一体化反演”(42174140);“深度偏移地震数据特征剖析与深度域直接反演方法研究”(41874153)

通讯作者: 孙成禹(1968-),男,教授,博士生导师,主要从事地震勘探方面的教学和科研工作。Email:suncy@upc.edu.cn

作者简介: 杜燚镜(1998-),女,硕士在读,主要研究方向为地震波传播理论研究、面波正演及参数反演。Email:732744916@qq.com

引用本文:

杜燚镜, 孙成禹, 王志农, 蔡瑞乾, 王升荣, 焦峻峰. 海水层对地震反射特征的影响研究[J]. 物探与化探, 2023, 47(3): 757-765.
DU Yi-Jing, SUN Cheng-Yu, WANG Zhi-Nong, CAI Rui-Qian, WANG Sheng-Rong, JIAO Jun-Feng. Effects of seawater layer on seismic reflection characteristics. Geophysical and Geochemical Exploration, 2023, 47(3): 757-765.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2023.1366 或 https://www.wutanyuhuatan.com/CN/Y2023/V47/I3/757

Fig.1 下传波场的海洋模型

Fig.2 上传波场的海洋模型

Table 1 模型参数

Fig.3 振幅频率响应随入射波频率变化曲线

Fig.4 振幅频率响应随海水层深度变化曲线

Fig.5 振幅频率响应随海底阻抗差变化曲线

Fig.6 不同入射波频率振幅频率响应随入射角变化曲线

Fig.7 不同海水层深度振幅频率响应随入射角变化曲线

Fig.8 不同海底阻抗差振幅频率响应随入射角变化曲线

Fig.9 弱阻抗差海底情况下的地震记录频谱

Fig.10 强阻抗差海底情况下的地震记录频谱

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