刘强^1,,
李振春^1,,,
张凯¹,
张敏¹,
肖建恩²,
徐学成¹
1. 中国石油大学(华东)地球科学与技术学院, 青岛 266580
2. 中国石化石油物探技术研究院, 南京 211103

基金项目: 国家科技重大专项（2016ZX05024-003-011，2016ZX05006-002），中石油重大科技专项塔里木深地项目（ZD2019-183-003），国家自然科学基金（41774133，42074133）和中国石油大学（华东）研究生创新工程（YCX2020017）共同资助


详细信息

作者简介: 刘强, 男, 1990年生; 在读博士, 主要从事地震波束偏移成像方法研究.E-mail: 18266200368@163.com

通讯作者: 李振春, 男, 1963年生, 教授, 博士生导师, 主要从事复杂介质地震波传播与正演模拟、各向异性介质参数反演与最小二乘逆时偏移、深部储层保幅成像与全波形反演的研究与应用工作.E-mail: leonli@upc.edu.cn

中图分类号: P631

收稿日期:2020-10-23
修回日期:2021-05-20
上线日期:2021-09-10

Dynamical focused-beam migration of converted waves in VTI media

LIU Qiang^1,,
LI ZhenChun^1,,,
ZHANG Kai¹,
ZHANG Min¹,
XIAO JianEn²,
XU XueCheng¹
1. China University of Petroleum(East China), Qingdao 266580, China
2. SINOPEC Geophysical research institute, Nanjing 211103, China


More Information

Corresponding author: LI ZhenChun,E-mail:leonli@upc.edu.cn

MSC: P631

--> Received Date: 23 October 2020
Revised Date: 20 May 2021
Available Online: 10 September 2021


摘要
摘要:采用多分量地震数据进行处理，可以得到高质量的转换波成像结果，进而为流体识别和裂缝预测等提供有效支持.本文在前人研究的基础上，通过求解各向异性介质qPSV转换波运动学和动力学射线追踪方程，获得转换波中心射线走时、路径及动力学信息；同时，通过修改动态聚焦型传播算子，构建出各向异性介质动态聚焦束，提出了一种各向异性介质转换波动态聚焦束偏移成像方法.模型试算的结果表明，本文研究的方法，通过综合运用纵横波信息，能够对低速异常区等复杂各向异性介质地质构造有效成像；同常规的各向异性介质转换波高斯束成像方法相比，本文研究方法在保证浅层成像精度的前提下，能够提高深层能量聚焦性，有效增强深层振幅能量.
关键词: VTI/
转换波/
射线追踪/
动态聚焦束

Abstract:Multi-component seismic data are been processed and interpreted in geophysical exploration. Through the processing of multi-component seismic data, the information of longitudinal and shear waves can be effectively used. Then the high-quality converted wave imaging results can be obtained, which further affect fluid identification and fracture prediction. Thus, an anisotropic ray tracing algorithm for qPSV converted wave is proposed by deriving the ray tracing equations of kinematics and dynamics on the basis of previous research. In this paper, the anisotropic ray tracing algorithm is introduced into Gaussian beam migration and an anisotropic dynamical focused-beam migration of converted waves method is proposed by applying dynamically focused beam propagation operator. The results of model test demonstrate that the method can effectively image geological structures with low velocity in complex anisotropic media by applying the information of longitudinal and shear waves. Compared with the conventional converted wave Gaussian beam migration in anisotropic media, the method studied in this paper can make the energy more focused and improve the imaging quality in the deep layer without reducing the imaging quality in the shallow layer. In this paper, the model results show the accuracy and validity of the method proposed.
Key words:VTI/
Converted wave/
Ray tracing/
Dynamically focused beam



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