印兴耀^1,2,,
赵正阳^1,2,
宗兆云^1,2
1. 中国石油大学(华东), 山东 青岛 266580
2. 海洋国家实验室海洋矿产资源评价与探测技术功能实验室, 山东 青岛 266580

基金项目: 国家自然科学基金（U1562215，41604101）和国家科技重大专项课题（2016ZX05024-004，2017ZX05009-001，2017ZX05036-005，2017ZX05032-003）联合资助


详细信息

作者简介: 印兴耀, 男, 1962年生, 教授, 博士生导师, 研究方向为勘探地球物理理论与方法.E-mail:xyyin@upc.edu.cn

中图分类号: P631

收稿日期:2017-09-01
修回日期:2018-03-29
上线日期:2018-07-05

Dispersion characteristics of seismic reflection and transmission coefficients based on layered double-porosity media

YIN XingYao^1,2,,
ZHAO ZhengYang^1,2,
ZONG ZhaoYun^1,2
1. China University of Petroleum(East China), Shandong Qingdao 266580, China
2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Shandong Qingdao 266580, China


MSC: P631

--> Received Date: 01 September 2017
Revised Date: 29 March 2018
Available Online: 05 July 2018


摘要
摘要:本文研究了纵波垂直入射情况下两种介质分界面处的纵波反射和透射系数的频散特性，分界面上下两侧分别为层状双孔页岩介质和层状双孔砂岩介质.当纵波沿垂直于分界面的方向传播至分界面处时，会在上层双孔介质中产生三类反射纵波，在下层双孔介质中产生三类透射纵波.基于层状双孔介质的特性，给出了分界面处的六个边界条件.根据层状双孔介质的波动方程，利用平面波分析得到了纵波的反射和透射系数.结果表明：当多孔介质中存在流体时，纵波的反射和透射系数与频率相关，即存在频散现象.波致流体流动是造成纵波反射和透射系数频散的主要原因.此外，结果还表明局部流体流动引起地震频带内反射和透射系数的频散，宏观Biot流引起超声频带内反射和透射系数的频散.本文同时对岩石参数对反射和透射系数频散曲线的影响进行了研究.
关键词: 层状双孔介质/
波致流体流动/
反射系数/
透射系数/
频散特性

Abstract:We studied the dispersive characteristics of P-wave reflection and transmission coefficients at the interface of two kinds of media under the vertical incidence of P-waves. The upper and lower sides of the interface were layered double-porosity shale media and layered double-porosity sandstone media, respectively. Three types of reflected and transmitted P-waves existed at the interface of the upper and lower double-porosity media when the P-waves propagated perpendicularly to the interface. Based on the properties of the layered double-porosity media, we introduced six boundary conditions at the interface. According to the wave equations of layered double-porosity media, the P-wave reflection and transmission coefficients were calculated based on the plane wave analysis. The results demonstrate that when fluid exists in the porous media, the P-wave reflection and transmission coefficients are related to the frequency and the dispersion phenomenon occurs. Wave-induced fluid flow is the main mechanic for the dispersion of the P-wave reflection and transmission coefficients. In addition, the results also indicate that the local fluid flow and macroscopic Biot flow can cause the dispersion of the reflection and transmission coefficients in the seismic band and ultrasonic band, respectively. We have further analyzed the effects of rock parameters on dispersive curves of reflection and transmission coefficients.
Key words:Layered double-porosity media/
Wave-induced fluid flow/
Reflection coefficient/
Transmission coefficient/
Dispersive characteristics



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