孙红日^1,,
王维红^1,,,
石颖^1,2,
徐嘉亮¹
1. 东北石油大学地球科学学院, 大庆 163318
2. "陆相页岩油气成藏及高效开发"教育部重点实验室, 大庆 163318

基金项目: 国家自然科学基金面上项目（41974116）和国家自然科学基金重点项目（41930431）联合资助


详细信息

作者简介: 孙红日, 女, 1997年生, 硕士研究生, 主要从事地震资料处理研究.E-mail: anna9759245@163.com

通讯作者: 王维红, 男, 1975年生, 教授, 博士生导师, 主要从事地震资料处理研究.E-mail: wangweihong@nepu.edu.cn

中图分类号: P631

收稿日期:2020-10-03
修回日期:2021-03-30
上线日期:2021-09-10

Suppression of internal multiples based on Marchenko theory by one step

SUN HongRi^1,,
WANG WeiHong^1,,,
SHI Ying^1,2,
XU JiaLiang¹
1. School of Earth Sciences, Northeast Petroleum University, Daqing 163318, China
2. Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Northeast Petroleum University, Daqing 163318, China


More Information

Corresponding author: WANG WeiHong,E-mail:wangweihong@nepu.edu.cn

MSC: P631

--> Received Date: 03 October 2020
Revised Date: 30 March 2021
Available Online: 10 September 2021


摘要
摘要:传统基于Marchenko理论自聚焦法压制层间多次波技术需要初始下行聚焦函数的估计，再进行多次波压制的自适应相减.论文基于传统方法的研究成果，提出了一种无需先验信息和自适应相减步骤的层间多次波压制方法.当聚焦点在实际反射层的反射点上时，上行格林函数为聚焦点上的脉冲源在表面所产生的上行波场，该反射层的反射将是上行格林函数的第一个同相轴.通过将格林函数与下行直达波场进行褶积，可将反射层处的所有焦点重新计算到地表，得到只含一次反射波的波场.利用初始下行聚焦函数和初始直达下行格林函数互为逆函数的关系，引入delta函数，将特定深度上所有聚焦点的聚焦函数投影到采集面上的检波器位置，可只利用地表获取的地震记录一步计算得到一次反射波.水平层状介质模型和复杂的含高速薄透镜地质体的介质模型中，进行了多次波压制的数值试验，通过与传统基于Marchenko理论自聚焦方法的压制效果进行对比分析，显示论文给出的一步法压制层间多次波的效果更好，进而验证了所提出方法的有效性和高精度的特点.
关键词: Marchenko/
一步法/
层间多次波/
数据驱动

Abstract:The traditional internal multiple suppression technique based on Marchenko autofocusing theory requires the estimation of the initial downgoing focusing function and the adaptive subtraction of multiple suppression. Based on research results of traditional methods, this paper proposes an internal multiple suppression method without prior information and adaptive subtraction steps. When the focus point is on the reflection point of the actual reflector, the upgoing Green's function is the upgoing wave field generated on the surface by the pulse source on the focus, and the reflection of the reflector will be the first event of the upgoing Green's function. By convolving the Green's function with the downward direct wave field, all the focal points at the reflector can be recalculated to the surface, and the wavefield containing only primaries can be obtained. Based on the inverse relationship between the initial downgoing focusing function and the initial direct downgoing Green's function, the delta function is introduced to project the focusing functions of all focus points at a specific depth onto the position at the surface, so that only the seismic records obtained from the surface are used to calculate the primary reflection waves in one step. Numerical experiments of multiple suppression are performed on a horizontal layered medium model and complex medium model with high-speed thin lens, respectively. Comparing the suppression effect with the traditional method based on Marchenko autofocusing shows that the one-step method proposed in this paper is better than the traditional method based on Marchenko autofocusing, which verifies the effectiveness and high precision of the proposed method.
Key words:Marchenko/
One-step method/
Internal multiple/
Data-driving



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