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物探与化探  2019, Vol. 43 Issue (4): 859-865    DOI: 10.11720/wtyht.2019.1417
     方法研究·信息处理·仪器研制 本期目录 | 过刊浏览 | 高级检索 |
裂隙连通性对含流体介质剪切波分裂特征的影响
唐杰, 李聪, 温雷, 戚瑞轩
中国石油大学(华东) 地球科学与技术学院,山东 青岛 266580
A study of influence of fracture connectivity on wave propagation characteristics
Jie TANG, Cong LI, Lei WEN, Rui-Xuan QI
School of Geosciences,China University of Petroleum,Qingdao 266580,China
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摘要 

地下介质受到多期构造运动的作用,裂缝以多组形式存在的现象比较普遍,多组裂隙之间的连通性会影响介质的弹性参数。计算含两组交错裂缝饱和岩石弹性模量时,对于裂隙连通的情况,先计算干燥岩石的弹性参数,再通过各向异性流体替换获得含流体裂隙介质的弹性参数。对于不相交裂隙的情况,先对两组裂隙分别计算其饱和裂纹韧度,再计算饱和裂隙岩石的总体弹性参数。研究结果表明:①油水饱和条件下,当裂隙连通时,剪切波分裂参数随着油饱和度的增加变化较小;当裂隙不连通时,剪切波分裂参数随着油饱和度的增加变化较大;②随着裂隙倾角θ的增大,剪切波分裂参数减小;③在油饱和条件下,当裂隙连通时,剪切波分裂参数随着孔隙度的增加稍稍增加;当裂隙不连通情况时,剪切波分裂参数随着孔隙度的增加而减小,减小程度相对较大。

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关键词 裂隙介质流体替换各向异性裂隙连通性剪切波分裂    
Abstract

The underground medium is affected by multi-stage tectonic movement,the phenomenon that the crack exists in multiple groups is common,and the connectivity between multiple sets of fractures will affect the elastic parameters of the medium.When the elastic modulus of a saturated rock with two sets of staggered fractures are calculated,in the case where the fracture is connected,the elastic parameters of the dry rock are calculated first,and then the elastic parameters of the fluid-containing fracture medium are obtained by anisotropic fluid replacement.In the case of non-intersecting fractures,first the saturated crack toughness is calculated for the two sets of fractures,and then the overall elastic parameters of the saturated fractured rock are calculated.Some conclusions have been reached:①Under oil-water saturation conditions,when the fractures are connected,the shear-wave splitting parameters change less with the increase of oil saturation;when the fracture is not connected,the shear wave splitting parameter changes greatly with the increase of oil saturation.②As the crack inclination angle θ increases,the shear wave splitting parameter decreases.③Under oil saturation conditions,shear wave splitting parameters increase slightly with increasing porosity when the fractures are connected;when the fracture is not connected,the shear wave splitting parameter decreases with the increase of porosity,and the degree of reduction is relatively large.

Key wordsfracture media    fluid substitution    anisotropy    fracture connectivity    shear-wave splitting
收稿日期: 2018-11-28      出版日期: 2019-08-15
:  P631.4  
基金资助:国家自然科学基金项目(41504097);国家自然科学基金项目(41874153)
作者简介: 唐杰(1980-),男,中国石油大学(华东)副教授,主要从事于微地震研究工作。Email: tangjie@upc.edu.cn
引用本文:   
唐杰, 李聪, 温雷, 戚瑞轩. 裂隙连通性对含流体介质剪切波分裂特征的影响[J]. 物探与化探, 2019, 43(4): 859-865.
Jie TANG, Cong LI, Lei WEN, Rui-Xuan QI. A study of influence of fracture connectivity on wave propagation characteristics. Geophysical and Geochemical Exploration, 2019, 43(4): 859-865.
链接本文:  
https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2019.1417      或      https://www.wutanyuhuatan.com/CN/Y2019/V43/I4/859
Fig.1  模型图示
a—裂隙连通;b—裂隙不连通
Fig.2  油饱和条件
a—裂隙连通时的纵波速度;b—裂隙不连通的纵波速度;c—裂隙连通时的剪切波分裂参数;d—裂隙不连通的剪切波分裂参数
Fig.3  油水饱和条件下剪切波分裂参数随油饱和度和θ的变化
a、c—裂隙连通;b、d—裂隙不连通
Fig.4  气水饱和条件下剪切波分裂参数随气饱和度和θ的变化
a、c—裂隙连通;b、d—裂隙不连通
Fig.5  油饱和条件下剪切波分裂参数随孔隙度和θ的变化
a—裂隙连通;b—裂隙不连通
Fig.6  油水饱和条件下剪切波分裂参数随油饱和度和裂隙参数ZNZT关系的变化
a—裂隙连通;b—裂隙不连通
Fig.7  油饱和条件下剪切波分裂参数随孔隙度和裂隙参数ZNZT关系的变化
a—裂隙连通;b—裂隙不连通
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