周东勇^1,2,,
印兴耀^1,2,,,
宗兆云¹
1. 中国石油大学(华东)地球科学与技术学院, 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 266071

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: 周东勇, 男, 1987年生, 在读博士研究生, 主要研究方向为储层预测与流体识别.E-mail:zhou_dongyong@163.com

通讯作者: 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、方法与应用.E-mail:xyyin@upc.edu.cn

中图分类号: P631

收稿日期:2018-03-06
修回日期:2019-04-08
上线日期:2019-07-05

Characteristics of reflection and transmission coefficients at the boundary of a porous medium saturated with two immiscible viscous fluids and porous medium saturated with a single viscous fluid

ZHOU DongYong^1,2,,
YIN XingYao^1,2,,,
ZONG ZhaoYun¹
1. School of Geosciences, China University of Petroleum, Shandong Qingdao 266580, China
2. Laboratory for Marine Mneral Resources, Qingdao National Laboratory for Marine Science and Technology, Shandong Qingdao 266071, China


More Information

Corresponding author: YIN XingYao,E-mail:xyyin@upc.edu.cn

MSC: P631

--> Received Date: 06 March 2018
Revised Date: 08 April 2019
Available Online: 05 July 2019


摘要
摘要:弹性孔隙介质分界面上的反透射系数特征，在岩性划分、流体识别、储层边界判识等方面有重要的应用.本文研究上层为含两项不混合黏性流体孔隙介质、下层为含单项黏性流体孔隙介质分界面上的反透射理论.首先根据两种孔隙介质分界面上的能量守恒得到边界条件，再将波函数、位移、应力与应变关系代入边界条件，推导出完全连通孔隙情况下，第一类纵波入射到孔隙介质分界面上的反透射系数方程.通过建立砂岩孔隙介质模型，分别分析不同孔隙流体类型、不同含油饱和度及不同入射角情况下，各类波的反透射系数特征.研究表明，第二、三类纵波反透射系数数值比第一类纵波小多个数量级，且两者对入射角的变化不敏感，但对孔隙流体性质、含油饱和度的变化较敏感，而横波反透射系数特征恰好与此相反；第一类纵波反透射系数特征比较复杂，入射角、孔隙流体的性质及含油饱和度的变化都对其产生影响.不同孔隙流体弹性物性的差异、孔隙介质中含油饱和度的变化及不同入射角引起垂向和切向应力分量的变化都会影响各类波的反透射系数特征，分析这些特征可以为研究储层含油气性提供理论基础.
关键词: 饱和流体孔隙介质/
含两项不混合流体孔隙介质/
黏性流体/
反透射系数

Abstract:The characteristics of reflection and transmission coefficients at the interface of elastic porous media are of great importance in lithology division, fluid identification, reservoir boundary identification and other aspects. This paper studies the theory of reflection and transmission coefficients at the boundary of a porous medium saturated with two immiscible viscous fluids and a porous medium saturated with a single viscous fluid. According to the conservation of energy at the interface of two porous media, we first derive the boundary conditions, then substitute wave functions, displacements and stress-strain relationships into them, and further derive the equation of reflection and transmission coefficients in the case of connected pores and the first P-wave incidence. On a sandstone porous medium model, we analyze the characteristics of the reflection and transmission coefficients of various kinds of waves with different types of pore fluids, oil saturation and incident angles, respectively. The results show that the values of reflection and transmission coefficients of the second and third type of P-waves are several orders of magnitude smaller than those of the first type P-wave, and they are insensitive to the change of incident angles, but sensitive to the variation of pore fluid properties and oil saturation, while the characteristics of the S-wave's coefficients are just the opposite. The reflection and transmission coefficients of the first type P-waves have complex characteristics, which are affected by the incident angles, the property of pore fluids and the change of oil saturation. The difference of elastic properties of different pore fluids, the change of oil saturation in porous media and the variation of vertical and tangential stress components caused by different incident angles can all affect the characteristics of reflection and transmission coefficients of various waves. The analysis of these characteristics can provide a theoretical basis for further study on features of oil and gas reservoirs.
Key words:Porous media saturated with a pore fluid/
Porous media saturated with two immiscible fluids/
Viscous fluids/
Reflection and transmission coefficients



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