田宵^1,2,,
张雄^1,2,,,
张华¹,
麻昌英¹,
戴梦雪¹,
储仿东³
1. 江西省防震减灾与工程地质灾害探测工程研究中心(东华理工大学), 南昌 330013
2. 中国科学技术大学地球与空间科学学院, 合肥 230026
3. 东方地球物理公司, 涿州 072751

基金项目: 江西省防震减灾与工程地质灾害探测工程研究中心开放基金资助项目（SDGD202007），国家自然科学基金（41704040，41664006，41874126），江西省教育厅科学技术研究项目（GJJ180399，GJJ170453）和东华理工大学博士启动基金（DHBK2018067，DHBK2017108）联合资助


详细信息

作者简介: 田宵, 女, 1991年生, 博士, 东华理工大学讲师, 主要从事微地震震源定位和速度位置联合反演等研究.E-mail:tianxiao@mail.ustc.edu.cn

通讯作者: 张雄, 男, 博士后, 主要从事近地表成像、微地震监测和地震预警等研究.E-mail:zxiong@mail.ustc.edu.cn

中图分类号: P631

收稿日期:2018-11-05
修回日期:2020-05-15
上线日期:2020-08-05

Full-interferometry imaging method for microseismic location

TIAN Xiao^1,2,,
ZHANG Xiong^1,2,,,
ZHANG Hua¹,
MA ChangYing¹,
DAI MengXue¹,
CHU FangDong³
1. Engineering Research Center for Seismic Disaster Prevention and Engineering Geological Disaster Detection of Jiangxi Province(East China University of Technology), Nanchang 330013, China
2. School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
3. BGP Inc., China national petroleum corporation, Zhuozhou 072751, China


More Information

Corresponding author: ZHANG Xiong,E-mail:zxiong@mail.ustc.edu.cn

MSC: P631

--> Received Date: 05 November 2018
Revised Date: 15 May 2020
Available Online: 05 August 2020


摘要
摘要:基于偏移成像的微地震定位方法由于可避免走时拾取误差以及可实现自动化定位等优点被广泛应用.绕射叠加方法将能量沿走时曲线聚焦到空间网格点上，进行成像时需要搜索发震时刻.干涉成像方法利用互相关提取的走时差信息可避免搜索发震时刻，但定位结果受数据信噪比的影响较大.为了进一步提高干涉成像法的定位精度，本文提出一种同时使用互相关和自相关道集的全干涉成像方法，增加的自相关道集提取的S-P走时差可降低震源-检波器方向的定位误差，提高定位精度.单井监测的理论测试和实际数据的研究结果表明，全干涉成像的定位精度高于仅使用互相关道集的干涉成像方法，同时计算效率高于绕射叠加方法.
关键词: 微地震/
井下监测/
干涉成像/
绕射叠加

Abstract:The migration-based source location methods have been widely used due to their robustness and automatism for detecting and locating weak microseismic events. Of them, the diffraction stacking method locates the event by stacking the amplitudes of seismic traces along the diffraction travel time curve, while it needs searching the origin time. The interferometry imaging method utilizes differential arrival times obtained by the cross-correlograms, which can avoid searching the origin time. However, its location results are sensitive to the signal-to-noise ratio of data. To solve this problem, this work proposes a full-interferometry imaging method which combines cross-correlograms and auto-correlograms to improve the location accuracy. The S-P differential traveltimes obtained by auto-correlograms can reduce the location errors along the direction of source-receiver. The numerical tests on the downhole monitoring model and research on field data indicate that the full-interferometry imaging method can obtain more accurate locations compared with the interferometry imaging method, and also improve the computational efficiency compared with the diffraction stacking method.
Key words:Microseismic/
Downhole monitoring/
Interferometry imaging/
Diffraction stacking



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