基于Poynting矢量的地震照明分析

doi:10.13278/j.cnki.jjuese.201701304

摘要/Abstract

摘要： 地震照明分析能够定量分析影响逆时偏移成像质量的因素。文章基于Poynting矢量方法进行地震定向照明分析及成像补偿方法研究,利用Poynting矢量进行波场传播角度分解,通过计算不同入射及散射波方向的部分照明建立局部照明矩阵。该矩阵包含了照明分析中波与地质结构相互作用所涉及的所有角度信息,可以方便地分析目标附近所有可能的入射波和散射波对局部照明的贡献。根据局部照明矩阵可以获得对地下结构的照明描述、采集倾角响应,并依此进行成像补偿计算。以SEG/EAGE模型作为数值计算实例,进行基于Poynting矢量的照明分析及成像补偿,有效地提高了成像质量。该方法为角度域逆时偏移成像校正及分辨率分析等提供了高效的处理手段。

关键词: Poynting矢量, 局部照明矩阵, 照明分析, 采集倾角响应

Abstract: The major factors impacting the quality of reverse time migration can be quantified via seismic illumination analysis. A target-oriented seismic directional illumination analysis and imaging compensation method based on Poynting vector is implemented. The source and receiver waves are decomposed into different propagation directions based on their Poynting vectors. Partial illumination from incident/scattering waves propagating along different directions are calculated and a local illumination matrix is acqcuired. The matrix is composed of information related to the incident angle, scattering angle, reflection angle, and the structure dip angle, which can be used as the basis for angle-domain illumination analysis. The subsurface illumination and acquisition dip response can be obtained according to local illumination matrix and image can be compensated by acquisition dip response. SEG/EAGE model is used as a numerical example and the image quantity is improved effectively. The method can be used on image compensation and resolution analysis efficiently.

Key words: Poynting vector, local illumination matrix, illumination analysis, acquisition dip response

中图分类号:

P631.4

杨弘宇, 刘继承, 段玉波. 基于Poynting矢量的地震照明分析[J]. 吉林大学学报(地球科学版), 2017, 47(1): 245-254.

Yang Hongyu, Liu Jicheng, Duan Yubo. Seismic Illumination Analysis Based on the Poynting Vector[J]. Journal of Jilin University(Earth Science Edition), 2017, 47(1): 245-254.

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