煤田地质与勘探Issue(3)：82-86,5.DOI:10.3969/j.issn.1001-1986.2014.03.019
微地震事件不同初至拾取方法的对比分析
Comparison of picking method of microseismic first-break
摘要
Abstract
Accurate picking of first breaks is one of the key technology of microseismic location. The paper ana-lyzes the principle of STA/LTA, AIC, fractal dimension of three kinds of microseismic first-break picking method, presents a detailed test and verification of the simulation data, and compares first-break picking accuracy and effi-ciency of the three algorithms through actual data with different S/N ratio. The results show that for the data with high S/N ratio, first break picking accuracy of three methods is relatively high. When SNR decreases, first-arrival time that fractal dimension method picks has higher precision and good noise immunity. However, fractal dimen-sion method has lower efficiency and is limited by algorithm principle, it is difficult to separately pick first breaks for fractal dimension and AIC method. So it is a very good method to identify microseismic events and determine preliminarily the time range of first breaks by STA/LTA method, then to pick first-arrival accurate time by AIC method.关键词
微地震/初至拾取/STA/LTA法/AIC法/分形维数法Key words
microseismic/picking of first breaks/STA/LTA/AIC/fractal dimension分类
天文与地球科学引用本文复制引用
段建华..微地震事件不同初至拾取方法的对比分析[J].煤田地质与勘探,2014,(3):82-86,5.基金项目
国家科技重大专项课题(2011ZX05040-002) （2011ZX05040-002）
