VTI介质自适应聚焦束偏移

doi:10.13810/j.cnki.issn.1000-7210.2020.01.011

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摘要自适应聚焦束是高斯束的改进，采用多次聚焦的思想，考虑局部速度场对波束宽度的影响，将地震波束有效能量控制在一个波长的范围内，与常规高斯束的不同点在于动态选择初始波束参数。将自适应聚焦束偏移方法应用到VTI介质，基于经典弹性参数表征下的各向异性射线追踪方程体系，结合自适应聚焦束处理强横向变速成像问题的优势，实现了VTI介质自适应聚焦束偏移。通过与传统高斯束形态的对比，突出了自适应聚焦束形态控制的优势。利用各向异性Sub-Sag模型验证了各向异性介质自适应聚焦束偏移方法的正确性和稳定性，各向异性SEG/Hess模型测试结果证明了该方法对复杂地质模型的适应能力；实际地震资料的处理结果表明，该方法成像效果优于传统各向异性高斯束偏移方法。

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关键词 ：高斯束, 自适应聚焦束, 各向异性, 射线追踪, 束形态

Abstract：Adaptive focused beam is an improvement of Gaussian beam.Considering the affection of local velocity field on beam width,it focuses multiple times to control the effective energy of seismic beam within one wavelength.Different from Gaussian beam,adaptive focused beam selects initial beam parameters dynamically.For adaptive focused beam is advantageous in dealing with the i-maging problem in the media with strong horizontal velocity variation,the adaptive focused beam migration method was applied to VTI media in this paper.Based on the anisotropic ray tracing equation system represented by classical elastic parameters,the adaptive focused beam migration in VTI media was realized.The comparison between the beam shape of traditional Gaussian beam and that of adaptive focused beam revealed the advantage of adaptive focused beam in beam shape control.Sub-Sag model test demonstrared the accuracy and stablity of adaptive focused beam migration method in anisotropic media.Anisotropic SEG/Hess model test demonstrated the feasibility of the method proposed in this paper on complex geological model.The application in real data processing demonstrated that the imaging effect of the method proposed in this paper is better than conventional Gaussian beam migration methods in anisotropic media.

Key words： Gaussian beam adaptive focused beam anisotropy ray tracing beam shape

收稿日期: 2019-03-11

PACS:

P631

基金资助:本项研究受国家自然科学基金面上项目“面向深部储层的时空域自适应高斯束成像理论方法及优化”（41874149）、国家科技重大专项“薄互层全波形反演和最小二乘偏移联合成像”（2016ZX05002-005-007）、“基于多次散射理论的散射波地震成像技术”（2016ZX05014-001-008）、山东省重大科技创新工程项目“基于天然地震的沂沭断裂带地区地下三维高精度建模研究”（2017CXGC1602）、青岛市项目（16-5-1-40-jch）及科技专项自主创新项目（17CX05011）联合资助。

通讯作者: 黄建平,山东省青岛市黄岛区长江西路66号中国石油大学(华东)地球科学与技术学院地球物理系,266580。Email:jphuang@upc.edu.cn E-mail: jphuang@upc.edu.cn

作者简介: 李胜雅,硕士研究生,1992年生;2017年获石油大学地球物理学专业学士学位;现为中国石油大学(华东)地球物理学专业硕士研究生,主要从事高斯束偏移方法的学习和研究。

引用本文:

李胜雅, 吕庆达, 黄建平, 李振春, 胡自多, 刘定进. VTI介质自适应聚焦束偏移[J]. 石油地球物理勘探, 2020, 55(1): 92-100. LI Shengya, LYU Qingda, HUANG Jianping, LI Zhenchun, HU Ziduo, LIU Dingjin. Adaptive focused beam migration in VTI media. Oil Geophysical Prospecting, 2020, 55(1): 92-100.

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http://www.ogp-cn.com/CN/10.13810/j.cnki.issn.1000-7210.2020.01.011 或 http://www.ogp-cn.com/CN/Y2020/V55/I1/92

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