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基于三维高斯束算子解析的方位-反射角道集提取技术研究

石油物探

2016年 55卷第No. 1期

阅读：85

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Title

Azimuth-opening angle domain common-image gathers from 3D Gaussian beam migration

单位

(1.同济大学海洋与地球科学学院波现象与反演成像研究组,上海200092;2.中国石油化工股份有限公司石油物探技术研究院,江苏南京211103)

Organization

(1.Wave Phenomena and Inversion Imaging Research Group (WPI),School of Ocean & Earth Science,Tongji University,Shanghai 200092,China; 2.Sinopec Geophysical Research Institute,Nanjing 211103,China)

摘要

通过三维叠前深度偏移提取地下成像点的共方位-反射角(或倾角-方位角)成像道集对于层析速度分析及振幅随角度变化分析(AVA)等至关重要。高斯束叠前深度偏移技术利用相互独立的高斯束描述波传播,并通过相邻高斯束的叠加计算波场,其实现方式解决了多路径问题,且无成像倾角限制。更重要的是,高斯束偏移提供了一种能高精度且方便高效地提取三维共方位-反射角度成像点道集的策略。通过解析求解高斯束算子,计算单个高斯束的波场传播方向矢量,进而通过不同高斯束的传播方向矢量计算得到成像点处的方位-反射角,从而实现三维高斯束叠前深度偏移方位-反射角成像道集的提取。数值计算及实际数据应用结果证明了三维高斯束叠前深度偏移共方位-反射角道集提取技术的有效性。

Abstract

Common-image gathers indexed by opening angle and azimuth at imaging point in 3D situation are key input for amplitude versus azimuth (AVA) analysis and traveltime velocity tomography.The Gaussian beam depth migration (GBM),propagating a beam along each ray and summing the contributions from all the individual beams to produce the wavefield,can overcome the multipath problem,image steep reflectors and more importantly provide a convenient and efficient strategy to extract azimuth-opening angle domain common-image gathers (ADCIGs) in 3D seismic imaging.We present a method for computing azimuth and opening angle at imaging point to output 3D ADCIGs by computing the Gaussian beams wavefield direction vectors,which are solved analytically from Gaussian beam function.Numerical tests and field data application demonstrate the exaction method of ADCIGs from 3D Gaussian beam depth migration is effective.

关键词：

方位-反射角道集; 高斯束偏移; 射线追踪;

Keywords:

azimuth-opening angle domain common-image gathers (ADCIGs),; Gaussian beam migration,; ray tracing;

基金项目

国家科技重大专项(2011ZX05014-001-002)项目资助。

DOI

10.3969/j.issn.1000-1441.2016.01.010