基于震幅叠加的微地震事件定位在地面监测中的应用

发布时间：2018-06-19 02:39

本文选题：压裂监测 + 短长时窗　；参考：《吉林大学学报(地球科学版)》2017年01期

【摘要】：在微地震地面监测中,由于微地震信号能量微弱,因此很难对微地震事件进行精确拾取。本文提出了一种基于STA/LTA(short term averaging/long term averaging)的判别频率估计模式识别方法,可以避免由于设定阈值出现漏判小能量微地震事件的情况,并在精度上比传统的STA/LTA方法提升10%以上。采用基于震幅叠加的能量聚焦方法对微地震事件进行定位计算,同时通过对能量聚焦结果的分析,进一步剔除"假"的微地震事件,从而能够更加精确地描述地下裂缝的发育情况。最后,通过对河北北部一水平井的压裂监测对该方法进行验证,结果表明,本方法计算效率高、监测结果获得施工单位的认可,能够对下一步压裂施工方案提供理论指导。
[Abstract]:In ground monitoring of microearthquakes, it is difficult to accurately pick up microseismic events because of the weak energy of microseismic signals. In this paper, a discriminant frequency estimation pattern recognition method based on STAL / LTA short term averaging/long term estimation is proposed, which can avoid the possibility of missing small energy microseismic events due to the setting of threshold, and the accuracy is more than 10% higher than that of the traditional STAP / LTA method. The energy focusing method based on amplitude superposition is used to locate and calculate the microseismic events, and the "false" microseismic events are further eliminated through the analysis of the energy focusing results. Thus, the development of underground fractures can be described more accurately. Finally, the method is verified by fracturing monitoring in a horizontal well in the north of Hebei Province. The results show that the method has high calculation efficiency, the monitoring results are approved by the construction units, and it can provide theoretical guidance for the next fracturing construction scheme.
【作者单位】：中联煤层气有限责任公司;吉林大学仪器科学与电气工程学院;
【基金】：国家科技重大专项项目(2011ZX05060)~~
【分类号】：P631.4

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