微地震定位的加权弹性波干涉成像法

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摘要震源定位是微地震监测关键技术之一。本文提出用于微地震定位的弹性波和加权弹性波（WEW）干涉成像方法。该方法在保证定位精度的同时，还可避免震源假象。通过各向同性水平层状介质模型的数值试验，初步表明该方法可适应低信噪比微震信号、速度随机扰动、较稀疏的检波器分布等情况，并在速度模型存在一定的系统误差时也仍保持较高的定位精度。由于干涉成像方法不需要进行初至拾取，定位效率相对传统走时方法也得到了提高。采用二维断层模型试算，表明方法还能实现多震源定位，且比逆时成像有更高的定位精度。

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	李磊
	陈浩
	王秀明

关键词： font-family: 宋体 mso-ascii-font-family: 'Times New Roman' mso-bidi-font-family: 'Times New Roman' mso-font-kerning: 1.0pt mso-ansi-language: EN-US mso-fareast-language: ZH-CN 微地震监测')" href="#">mso-bidi-language: AR-SA">微地震监测震源定位弹性波干涉color: black font-family: 宋体 mso-ascii-font-family: Tahoma mso-bidi-font-family: Tahoma mso-ansi-language: EN-US mso-fareast-language: ZH-CN mso-bidi-language: AR-SA 成像mso-hansi-font-family: Tahoma">成像font-family: 宋体 mso-ascii-font-family: 'Times New Roman' mso-bidi-font-family: 'Times New Roman' mso-font-kerning: 1.0pt mso-ansi-language: EN-US mso-fareast-language: ZH-CN ')" href="#">mso-bidi-language: AR-SA"> 逆时成像

Abstract： Knowledge of the locations of seismic sources is critical for microseismic monitoring. Time-window-based elastic wave interferometric imaging and weighted-elastic-wave (WEW) interferometric imaging are proposed and used to locate modeled microseismic sources. The proposed method improves the precision and eliminates artifacts in location profiles. Numerical experiments based on a horizontally layered isotropic medium have shown that the method offers the following advantages: It can deal with low-SNR microseismic data with velocity perturbations as well as relatively sparse receivers and still maintain relatively high precision despite the errors in the velocity model. Furthermore, it is more efficient than conventional traveltime inversion methods because interferometric imaging does not require traveltime picking. Numerical results using a 2D fault model have also suggested that the weighted-elastic-wave interferometric imaging can locate multiple sources with higher location precision than the time-reverse imaging method.

Key words： Microseismic monitoring seismic source location elastic wave interferometric imaging time-reverse imaging

收稿日期: 2014-10-28;

基金资助:

本研究由国家重大科研装备研制项目“深部资源探测核心装备研发”（编号：ZDYZ2012-1）和国家自然科学基金（编号：11374322）资助。

引用本文:

李磊,陈浩,王秀明. 微地震定位的加权弹性波干涉成像法[J]. 应用地球物理, 2015, 12(2): 221-234.

Li Lei,Chen Hao,Wang Xiu-Ming. Weighted-elastic-wave interferometric imaging of microseismic source location[J]. APPLIED GEOPHYSICS, 2015, 12(2): 221-234.

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