套管井应力集中诱导井周波速各向异性的研究  

The effects of stress concentrations of cased hole on induced azimuthal anisotropy velocity distribution

作　　者：刘金霞[1] 王克协[1] 曹正良[1] 谢荣华 刘继生 吕秀梅 

机构地区：[1]吉林大学物理学院,长春130023 [2]大庆测试技术服务分公司,大庆163153

出　　处：《地球物理学报》2005年第3期717-723,共7页Chinese Journal of Geophysics

基　　金：国家自然科学基金项目 (4 0 3 740 43 ;40 0 740 3 2 );博士点专项基金项目 (2 0 0 3 0 183 0 5 2 )资助

摘　　要：针对在套管井中应用正交偶极声测井检测地层各向异性和确定异常构造应力的需要,本文通过求解水平构造应力作用下套管井的应力场分布,应用声弹性理论说明应力集中对套管井井周弹性波速空间分布的影响,分析了波速空间分布对加套管后的正交偶极各向异性声测量的影响.井孔、套管、水泥环和地层系统的复杂性改变了原裸眼井情况地层中的应力场分布,使应力集中的范围明显缩小到井眼附近.对应不同方位径向偏振横波的交叉点向井孔附近移动.横波波速空间分布的方位极值规律发生变化,但纵波波速空间分布的方位极值规律不变,仍能提供最大远场构造应力施加的方向.According to the need of estimating anisotropy and abnormal stress of formation by cross-dipole logging in a cased hole, we show how stress concentrations affect the velocity distribution of formation around a cased hole, and how the velocity distribution influences the cross-dipole anisotropy measurements by computing the stress distribution of a cased hole subjected to the tectonic stress and applying acoustoelasticity theory. The introduction of casing and cement in a cased hole results in that the range of stress concentrations becomes small. The crossover of shear-waves of radial polarization moves towards the borehole. The azimuthal extremum of shear-waves is changed. But the azimuth of compressional velocity minima can still provide an excellent indicator of the direction of maximum far-field tectonic stress.

关 键 词：应力集中 套管井 各向异性 波速空间分布 正交偶极 构造应力 

分 类 号：P631[天文地球—地质矿产勘探]