一种改进的相邻道互相关函数法地面微地震信号压噪研究
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摘要
油气田射孔作业引发的微地震事件频率高、持续时间短、能量小,地面采集时很容易被周围的环境噪声淹没。在进行微地震信号特征分析前必须首先进行微地震信号的滤波处理,由于微地震事件能量低,使用常规的滤波方法难以检测出地面检波器采集的微地震信号。因此,提出了一种基于随机信号统计理论的互相关函数检测方法,该方法不仅在衰减环境噪声方面有良好的效果,而且也能够检测出地面检波器采集的各种信号。
The micro-seismic events caused by perforating obtained higher frequency,shorter period and lower energy.It's signals were easy to be annihilated by the noise around.To obtain the characteristics of the micro-seismic signals,it was essential to filter to the micro-seismic data.Because the energy is low for the micro-seismic process,it is difficult to discern the effective singles with conventional filtering methods.So,a cross-correlation filtering technology is proposed based on the random signal detection theory.The technology can achieve a good result in the elimination of random noise acquired ion the ground.
The micro-seismic events caused by perforating obtained higher frequency,shorter period and lower energy.It's signals were easy to be annihilated by the noise around.To obtain the characteristics of the micro-seismic signals,it was essential to filter to the micro-seismic data.Because the energy is low for the micro-seismic process,it is difficult to discern the effective singles with conventional filtering methods.So,a cross-correlation filtering technology is proposed based on the random signal detection theory.The technology can achieve a good result in the elimination of random noise acquired ion the ground.
引文
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[2]Eaton D W.Q determination,corner frequency and spectral characteristics of microseismicity induced by hydraulic fracturing[A].2011SEG Annual Meeting[C].San Antonio,2011-9-18～23.
[3]Forghani-Arani F,Willis M,Haines S,et al.Analysis of passive surface-wave noise in surface microseismic data and its implications[A].2011SEG Annual Meeting[C].San Antonio,2011-9-18～23.
[4]Diller D E,Gardner S P.Comparison of simultaneous downhole and surface microseismic monitoring in the Williston Basin[A].2011SEG Annual Meeting[C].San Antonio,2011-9-18～23.
[5]王有新.应用地震数据处理方法[M].北京:石油工业出版社,2009.63～70.
[6]刘俊,张斌珍.微弱信号检测技术[M].北京:电子工业出版社,2005.86～93.
[7]石颖,刘洪.地震信号的复地震道分析及应用[J].地球物理学进展,2009,23(5):134～141.
[8]王书明,朱培民,李宏伟,等.地球物理学中的高阶统计量方法[M].北京:科学出版社,2006.56～67.
[9]Norton M,Hovdebo W.Surface seismic to microseismic:An integrated case study from exploration to completion in the Montney shaleof NE British Columbia,Canada.SEG Denver[A].2010SEG Annual Meeting[C].Denver,2010-10-17～22.
[10]朱良保,王清东.地震背景噪声互相关函数的面波理论表达形式[J].地球物理学报,2011,54(7):89～98.
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