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基于Sinc插值与相关谱的纵横波速度比扫描方法
引用本文:王荐,吴波,徐天吉. 基于Sinc插值与相关谱的纵横波速度比扫描方法[J]. 西南石油大学学报(自然科学版), 2019, 41(1): 85-90. DOI: 10.11885/j.issn.1674-5086.2018.01.11.01
作者姓名:王荐  吴波  徐天吉
作者单位:1. 中国石化多波地震技术重点实验室, 四川 成都 610041;2. 中国石化西南油气分公司勘探开发研究院, 四川 成都 610041
基金项目:国家科技重大专项(2017ZX05005-004)
摘    要:在多分量地震技术中,准确地求取出纵、横波速比(γ)是多分量资料处理、反演、解释各环节中的一个重要步骤。由于地下同一层位具有相同的波阻抗比,因此该层位的反射纵波和反射转换波相互关联,纵横波速比与时间比存在相互转化关系。基于Sinc插值算法与相关系数谱分析的纵横波速比扫描方法是通过设置一系列γ,利用Sinc插值算法将纵波拉伸后与转换波进行互相关,当互相关系数达到最大时即可求出相应的γ。理论数据和实际资料的测试,验证了该方法的有效性、准确性和实用性。

关 键 词:多分量地震技术  转换波  纵横波速比值  Sinc插值  互相关系数  
收稿时间:2018-01-11

P-wave to S-wave Velocity Ratio Scanning Method Based on the Sinc Interpolation and Correlation Spectrum
WANG Jian,WU Bo,XU Tianji. P-wave to S-wave Velocity Ratio Scanning Method Based on the Sinc Interpolation and Correlation Spectrum[J]. Journal of Southwest Petroleum University(Seience & Technology Edition), 2019, 41(1): 85-90. DOI: 10.11885/j.issn.1674-5086.2018.01.11.01
Authors:WANG Jian  WU Bo  XU Tianji
Affiliation:1. SINOPEC Key Laboratory of Multi-Components Seismic Technology, Chengdu, Sichuan 610041, China;2. Exploration and Production Research Institute, Southwest Oil and Gas Company, SINOPEC, Chengdu, Sichuan 610041, China
Abstract:In the multi-component seismic technique, accurate extraction of the P-wave to S-wave velocity ratio (γ) is an important step in multi-component data processing, inversion, and interpretation. As the wave impedance ratio for the same underground layer is the same, the reflected P-wave and reflected converted wave are interrelated at this layer. The P-wave to S-wave velocity ratio and time ratio can be mutually converted. In the P-wave to S-wave velocity ratio scanning method based on the sinc interpolation algorithm and correlation coefficient spectrum analysis, a series is set, and the sinc interpolation algorithm is used to cross-correlate the stretched P-wave with the converted wave. When the cross-correlation coefficient reaches its maximum value, the corresponding ratio can be obtained. The effectiveness, accuracy, and practicality of this method are verified through testing with both theoretical and actual data.
Keywords:multi-component seismic technique  converted wave  P-wave to S-wave velocity ratio  sinc interpolation  crosscorrelation coefficient  
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