朱洪翔^1,,
田有^1,2,3,,,
刘财^1,2,
冯晅^1,2,3
1. 吉林大学地球探测科学与技术学院, 长春 130026
2. 国土资源部应用地球物理重点实验室, 长春 130026
3. 油页岩地下原位转化与钻采技术国家地方联合工程实验室, 长春 130026

基金项目: 国家重点研发计划（2017YFC0601301），国家自然科学基金项目（41474030）与地质调查项目（DD20160207）联合资助


详细信息

作者简介: 朱洪翔, 男, 1991年生, 博士研究生, 从事接收函数研究工作.E-mail:zhuhx14@mails.jlu.edu.cn

通讯作者: 田有, 男, 1979年生, 教授, 从事地球内部介质属性成像及动力学研究工作.E-mail:tianyou@jlu.edu.cn

中图分类号: P315

收稿日期:2017-03-13
修回日期:2018-01-23
上线日期:2018-09-05

Estimation of the crustal structure beneath the sedimentary Basin: Predictive deconvolution method to remove multiples reverberations of the receiver function

ZHU HongXiang^1,,
TIAN You^1,2,3,,,
LIU Cai^1,2,
FENG Xuan^1,2,3
1. College of Geo-exploration Science and Technology, Jilin University, Changchun 130026, China
2. Key Laboratory of Applied Geophysics, Changchun 130026, China
3. National-Local Joint Engineering Laboratory of In-situ Conversion, Drilling and Exploitation Technology for Oil Shale, Changchun 130026, China


More Information

Corresponding author: TIAN You,E-mail:tianyou@jlu.edu.cn

MSC: P315

--> Received Date: 13 March 2017
Revised Date: 23 January 2018
Available Online: 05 September 2018


摘要
摘要:接收函数方法被广泛地应用于地壳上地幔结构的研究中，H-κ叠加方法是其中最常用的方法之一.对于布设在基岩区台站计算的接收函数，H-κ叠加方法可以准确地估计台站下方地壳厚度和平均波速比，但是对于沉积盆地地区计算的接收函数，由于低速沉积层内会产生多次波混响，干扰甚至覆盖接收函数中莫霍面的转换波和多次波震相，从而影响H-κ叠加结果的准确性.为准确估计沉积盆地地区地壳结构，本文提出使用预测反褶积方法去除接收函数中低速沉积层内多次波混响，其中预测步长由接收函数归一化自相关函数获得，物理意义为沉积层内S波双程走时.合成接收函数和实测接收函数试验表明，本文提出的预测反褶积方法可以有效地去除沉积层多次波混响，并结合改进的H-κ叠加方法可以准确地估计沉积层下覆地壳厚度和平均波速比.相比于其他去除接收函数多次波混响的方法，本文提出的预测反褶积方法具有参数设定简单、运算量小、震相幅值较大等特点，适用于大批量数据处理.
关键词: 接收函数/
沉积盆地/
多次波混响/
预测反褶积/
H-κ叠加

Abstract:Recently, the receiver function technique has been widely applied to investigate the layered structures of the crust and upper mantle, and the H-κ stacking is one of the commonly used methods. H-κ stacking method is effective to estimate the crustal thickness and average V_P/V_S ratio beneath a station lying on the bedrock, however, for the stations on sedimentary basin, the presence of low-velocity sedimentary layer can give rise to strong reverberations in the observed receiver functions, usually influencing and even masking the useful phases from Moho discontinuity. In order to accurately measure the crustal thickness and V_P/V_S ratio beneath the sedimentary basin, we propose a predictive deconvolution method to remove the near-surface reverberations. Autocorrelation of single receiver function is first applied to determine the prediction step length, which is defined by the two-way S wave travel-time in the sedimentary layer. Synthetic and observed receiver function tests show that the near-surface reverberations can be effectively removed by applying predictive deconvolution method, and the processed receiver functions are suitable to accurately estimate the subsediment crustal thickness and V_P/V_S ratio using an improved H-κ stacking method. Comparing to previous methods applied to eliminate near-surface reverberations, the proposed method has the characteristics of fewer input parameters, less computational complexity and more obvious phases, which is suitable for mass data processing.
Key words:Receiver function/
Sedimentary basin/
Reverberations/
Predictive deconvolution/
H-κ stacking



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