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1、第55卷第1期石油物探VoL55。No.12016年1月GEOPHYSICALPR0SPECTINGFORPETR0LEUMJan.,2016秦暄,宋維琪.基于同步壓縮變換微地震弱信號(hào)提取方法研究EJ].石油物探,2016,55(1):60—66QINXuan,SONGWeiqi.weaksignalextractionmethodofmicroseismicdatabasedonsynchrosqueezingtransformEJ].Geo—physicalProspectingforPetroleum,2016,55(1):60—66基于同步壓縮
2、變換微地震弱信號(hào)提取方法研究秦喧,宋維琪(中國(guó)石油大學(xué)(華東)地球科學(xué)與技術(shù)學(xué)院,山東青島266580)摘要:針對(duì)微地震資料的信噪比低,無法清晰識(shí)別P波和s波的問題,根據(jù)微地震信號(hào)具有隨機(jī)性、非平穩(wěn)性的特點(diǎn),研究了基于同步壓縮變換(synchrosqueezingtransform,SST)微地震弱信號(hào)提取方法。首先利用SST對(duì)信號(hào)進(jìn)行自適應(yīng)閾值去噪,然后在有效信號(hào)的頻率中心附近進(jìn)行SST系數(shù)的積分抽取,再利用抽取的有效信號(hào)進(jìn)行SST重構(gòu)實(shí)現(xiàn)弱信號(hào)的提取。應(yīng)用于合成的含不同強(qiáng)度噪聲的非平穩(wěn)信號(hào)模型以及實(shí)際微地震單道記錄的處理結(jié)果表明,該方法具有較好的抗
3、噪能力和較高的信號(hào)提取精度。將該方法應(yīng)用于實(shí)際井中微地震數(shù)據(jù)的試處理和分析,并與常規(guī)低通濾波結(jié)果進(jìn)行了對(duì)比,表明該方法能夠較好地將弱有效信號(hào)從噪聲中提取出來,具有較好的實(shí)用價(jià)值。關(guān)鍵詞:微地震;同步壓縮變換;弱信號(hào)提?。蛔赃m應(yīng)閾值去噪中圖分類號(hào):P631文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1000—1441(2016)01—0060—07DOI:10.3969/j.issn.1000—1441.2016.01.008Weaksignalextractionmethodofmicroseismicdatabasedon.synchr0squeezingtransfo
4、rmQINXuan,SONGWeiqi(SchoolofGeosciences,ChinaUniversityofPetroleum,Qingdao266580,China)Abstract:ItisverydifficulttoclearlyidentifytheP-waveandS~waveduetOthelowSNRofmicroseismicdata.Accordingtothecharacteristicsofrandomnessandnon-stationaryofmicroseismicsignals,weproposedamethodt
5、oextracttheweaksignalfrommicroseismicdatabasedonsynchrosqueezingtransform(SST).Firstly,weutilizetheSSTtoconducttheadaptivethresholddenoising.Then,theSSTcoefficientsareextractednearthecenterfrequencyofeffectivesignalbyintegrating.Fi—nally,wecarryouttheSSTreconstructionusingtheext
6、ractedeffectivesignalSSTcoefficientstoimplementtheweaksignalextraction.Thetestresultsofthesynthesisnon-stationarysignalmodelswithdifferentnoiseintensityandtheactualmicro—seismicsingle-channelrecordshowthatthismethodhasbetternoiseimmunityandhighersignalextractionaccuracy.Throught
7、heprocessingandanalysisoftheactualboreholemicroseismicdataandthecomparisonwithconventionallow-passfiltering,theproposedmethodhasgoodcapabilityandisbettertoextracttheweakeffectivesignalfromthenoise.Keywords:microseismic,synchrosqueezingtransform,weaksignalextraction,adaptivethres
8、holddenoising在油氣田開發(fā)過程中,微地震監(jiān)測(cè)是獲得水力號(hào)進(jìn)行濾波去噪,將有效信號(hào)從