CAJ | 학술논문

原始微地震监测数据的信噪比相对较低，监测数据品质决定了微地震有效信号的定位精度，提高监测数据信噪比是微地震处理的关键环节。改进S变换对窗函数进行能量归一化处理，解决了常规S变换时频谱中频率定位不准的问题，具有更高的时频分辨率精度。利用改进S变换的良好二维时频域聚焦特性，设计时变的二维时频域滤波器，将时频域去噪方法引入到微地震监测数据的去噪处理中。利用改进S变换对微地震监测数据进行时频分析，能够更加准确地分析不同信号分量的振幅能量以及频率随时间的变化情况，实现微地震有效信号分量与噪声干扰分量的有效分离。通过合成模拟信号和实际井中微地震监测数据的试处理和对比分析，验证了该方法的可行性和有效性。
원시미지진감측수거적신조비상대교저，감측수거품질결정료미지진유효신호적정위정도，제고감측수거신조비시미지진처리적관건배절。개진S변환대창함수진행능량귀일화처리，해결료상규S변환시빈보중빈솔정위불준적문제，구유경고적시빈분변솔정도。이용개진S변환적량호이유시빈역취초특성，설계시변적이유시빈역려파기，장시빈역거조방법인입도미지진감측수거적거조처리중。이용개진S변환대미지진감측수거진행시빈분석，능구경가준학지분석불동신호분량적진폭능량이급빈솔수시간적변화정황，실현미지진유효신호분량여조성간우분량적유효분리。통과합성모의신호화실제정중미지진감측수거적시처리화대비분석，험증료해방법적가행성화유효성。
The microseismic monitoring data have low signal?to?noise ratio and contain lots of noise with different characteristics.The lo?cation accuracy of the microseismic event depends on the signal?to?noise ratio of microseismic monitoring data.In microseismic monito?ring data processing,it is very important to improve the signal?to?noise ratio.The improved S transform,which has high time?frequency solution,is useful for microseismic monitoring data.Microseismic events can be better processed in time?frequency spectrum than in con?ventional Fourier transform.Based on the fine focus in time?frequency domain and flexible window function choice of improved S trans?form,the authors designed a 2D time variable time?frequency filter,which was used to process micro?seismic monitoring data.The com?bined signal and field micro?seismic monitoring data demonstrate the feasibility and efficiency of the method.