横向各向同性弹性地层井孔中模式波的探测深度

横向各向同性弹性地层井孔中模式波的探测深度

陈雪莲¹，王瑞甲²

1.中国石油大学地球资源与信息学院，山东东营 257061;2.中国石油大学资源与信息学院，北京 102249

收稿日期:2007-09-27 修回日期:1900-01-01 出版日期:2008-05-26 发布日期:2008-05-26
通讯作者: 陈雪莲

Investigating Depth of Mode Waves in the Borehole Surrounded by Transversely Isotropic Elastic Formation

CHEN Xue-lian¹,WANG Rui-jia²

1.College of Geo-Resources and Information, China University of Petroleum, Dongying,Shandong 257061,China;2.Faculty of Natural Resources & Information Technology, China University of Petroleum, Beijing 102249,China

Received:2007-09-27 Revised:1900-01-01 Online:2008-05-26 Published:2008-05-26
Contact: CHEN Xue-lian

摘要/Abstract

摘要： 研究了横向各向同性(TI)弹性地层充液井孔中模式波的频散曲线和灵敏度曲线。结果显示:弯曲波对地层中垂直向传播的横波速度比较敏感，而斯通利波对地层中水平向传播的横波速度较灵敏；在慢速地层中，从斯通利波(或弯曲波)对不同径向位置和不同波数下水平向 (或垂直向) 传播的横波速度的灵敏度曲线上可知，斯通利波的探测深度在整个计算频段约为1.5个井眼半径(距井壁距离)，弯曲波的探测深度相对较深，但受波数影响大:在较低波数时，其探测深度约为4个井眼半径，较高波数时约为1.5个;在快速地层中，由于受井内流体的影响较大，弯曲波在较高波数时探测深度稍有下降，但斯通利波对地层性质的敏感程度明显降低甚至消失。

关键词: 横向各向同性, 弯曲波, 斯通利波, 探测深度, 灵敏度

Abstract: The curves of the dispersion and sensitivity for the mode waves in the borehole surrounded by a transversely isotropic elastic solid are numerically simulated. The results show that the flexural wave is sensitive to the velocity of the vertically propagating shear wave (v_SV), while the Stoneley wave is sensitive to the velocity of the horizontally propagating shear wave (v_SH). In the slow formation, the investigating depth of the Stoneley wave is about 1.5 radius of the borehole to the wall for the full calculating frequency range; the flexural wave exhibits frequencydependent characteristic of the radial depth of investigation, and the investigating depth is deep (about 4 radius of the borehole) with low wavenumbers and shallow (about 1.5 radius of the borehole) with high wavenumbers. In the fast formation, the sensitivity of the flexural wave to the v_SV diminishes slightly, but the sensitivity of the Stoneley wave to the v_SH diminishes significantly due to the influence of the fluid filled in the borehole.

Key words: transversely isotropic elastic formation, flexural wave, Stoneley wave, investigating depth, sensitivity

中图分类号:

P631.8

陈雪莲，王瑞甲. 横向各向同性弹性地层井孔中模式波的探测深度[J]. J4, 2008, 38(3): 502-0507.

CHEN Xue-lian,WANG Rui-jia. Investigating Depth of Mode Waves in the Borehole Surrounded by Transversely Isotropic Elastic Formation[J]. J4, 2008, 38(3): 502-0507.

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