利用测井曲线反褶积方法提高薄层识别能力

:10000747(2010)05057904张涛,林承焰,张宪国(中国石油大学(华东)地球资源与信息学院):国家863重点项目基于多尺度地球物理资料匹配的油藏综合解释及建模技术(2007AA060501):针对老油田早期测井曲线垂向分辨率难以满足地质精细研究需要的问题,将信号反褶积原理应用于测井曲线处理通过将反褶积问题转化为期望输出与实际输出的误差极值问题构造线性方程组,求解方程组得到反褶积因子,从而实现测井曲线的盲反褶积处理通过处理,消除了围岩等因素的影响,对测井曲线上低幅度的细微变化产生了放大效应,这种效应在单层厚度0.5m左右的砂泥岩薄互层地层中体现最为明显,同时该处理对测井曲线斜率的微小变化反映更加灵敏实际测井资料处理前后的频谱对比表明,该方法增强了测井曲线高频段能量,提高了测井曲线对沉积界面,尤其是薄互层界面的识别能力,通过取心井资料检验,验证了反褶积处理结果的地质意义合理性图3参10:测井曲线;盲反褶积;薄互层;分辨率:P631.1:AImprovethinbedsdiscriminationusingthelogcurvesdeconvolutionmethodZhangTao,LinChengyan,ZhangXianguo(CollegeofGeoresourcesandInformation,ChinaUniversityofPetroleum,Dongying257061,China)Abstract:Inmatureoilfields,verticalresolutionofearlylogcurvesisnothighenoughforthecharacterizationofthinbedsanddoesn!tmeetthedemandofdelicategeologicresearch.Aimedatthisproblem,theprocessofblinddeconvolutionforlogcurvesisdeveloped.Thealgorithmofthismethodis:formlinearequationsbytransformingtheproblemofdeconvolutionintoanextremevalueproblembetweentheexpectedandactualoutputsignals,andthengetthedeconvolutionfactorbysolvingtheequations.Bythisprocess,theinfluencesofsurroundingrocksarewiped,theenergyofhighfrequencybandinfrequencyspectrumisimproved,thenewcurveismoresensitivetothevarianceofcurveslope,lowamplitudevariancesofcurvesarezoomedinandthecharacteristicsofsedimentarysurfacesaremoredistinct.Theidentificationabilityofprocessedlogcurvesinthinbedsinterpretation,especiallyinalternatingbedswithsinglebedsabout0.5mthick,isimprovedafterthedeconvolutionprocess.Thegeologicalrationalityofdeconvolutionprocessisverifiedbyresearchwithcoredwelldata.Keywords:loggingcurve;blinddeconvolution;thininterbed;resolution,,,,,[1],,11.1,,,[2],:Y=H*X(1)(1),,,[2],1.2a(t)[3],a(t)[2,4],,,[5,6](1)H579201010PETROLEUMEXPLORATIONANDDEVELOPMENTVol.37No.5X,,:b(t)=(b(0),b(1),∀,b(n));(t)=((0),(1),∀,(m));y(t)=(t)*b(t)=a()b(t-)=(y(0),y(1),∀,y(M));d(t)=(d(0),d(1),∀,d(M));e(t)=d(t)-y(t);Q=Mt=0e2(t)=Mt=0[y(t)-d(t)]2:min(Q)=minMt=0d(t)-y(t)2=minMt=0M=0a()b(t-)-d(t)2Q(t),,:m=0a()Mt=0b(t-)b(t-s)=Mt=0d(t)b(t-s)(s=0,1,∀,m)(2):rbb(-s)=Mt=0b(t-)b(t-s)(3)rdb(s)=Mt=0d(t)b(t-s)(4)(2):m=0a()rbb(-s)=rdb(s)(s=0,1,∀,m)(5),[3],d(t)=(t),rdb(s)=m+nt=0d(t)b(t-s)=m+nt=0(t)b(t-s)=b(0),s=00,s#0(6)(5):rbb(0)rbb(1)∀rbb(m)rbb(1)rbb(0)∀rbb(m-1)!!!!rbb(m)rbb(m-1)∀rbb(0)a(0)a(1)!a(m)=b(0)0!0(7)(6)b(0),[4],:rbb(0)rbb(1)∀rbb(m)rbb(1)rbb(0)∀rbb(m-1)!!!!rbb(m)rbb(m-1)∀rbb(0)a(0)a(1)!a(m)=10!0(8)(8),(t),2D,,[710]2.1,(1),1H144GR580∃Vol.37No.5,H144,GR,0.5m(N2N10N11;S3S11S12),(S7N7S8),,,H14450(1),,50%753,,H144(2),0.4Hz,0.4Hz,;0.4Hz,,2H1442.2,,D,,9(3,&%∋),,,,,,,3D581201010:3,,,,,,,,,(),,,:Y%%%;X%%%;H%%%;b(t)%%%;b(0),b(1),∀,b(n)%%%;a(t)%%%;a(0),a(1),∀,a(m)%%%;y(t)%%%;y(0),y(1),∀,y(M)%%%;d(t)%%%;d(0),d(1),∀,d(M)%%%;e(t)%%%;Q%%%;(t)%%%;GR%%%,API;GR1%%%,API:[1],,,.21[J].,2007,34(6):711717.SunXiping,LiJinsong,ZhengXiaodong,etal.ApplicationoftuningenergyenhancedmethodtothinbedidentificationinBlockShinan21[J].PetroleumExplorationandDevelopment,2007,34(6):711717.[2],,,.[M].:,1999.NiuChaoqun,AnFengquan,NiuHua,etal.Highresolutionprocessingoflogcurves[M].Beijing:GeologicalPublishingHouse,1999.[3],.[M].:,2004.LiZhenchun,ZhangJunhua.Processingmethodofseismicdata[M].Dongying:UniversityofPetroleumPress,2004.[4],.[J].(),2005,29(6):2022.ZhuZhenyu,LiuHong.Sparsedeconvolutionmethodanditsapplication[J].JournaloftheUniversityofPetroleum,China,2005,29(6):2022.[5]ZhuZhenyu,PeiJiangyun,LXiaolin,etal.Blinddeconvolutionmethodbasedonpreconditionconjugategradients[J].PetroleumScience,2004,1(3):3739.[6],,.[J].,2008,35(1):101107.SunJianmeng,WangKewen,LiWei.Developmentandanalysisofloggingsaturationinterpretationmodels[J].PetroleumExplorationandDevelopment,2008,35(1):101107.[7],,,.[J].,2009,36(2):221227.LiXia,FanYiren,DengShaogui,etal.Automaticdemarcationofsequencestratigraphyusingthemethodofwellloggingmultiscaledatafusion[J].PetroleumExplorationandDevelopment,2009,36(2):221227.[8],,./[J].,2009,36(6):725729.DengShaogui,LiZhuqiang,LiZhiqiang,etal.Responseofduallaterologandfastcorrectionforlayerthicknessandshoulderbedinhorizontalwells[J].PetroleumExplorationandDevelopment,2009,36(6):725729.[9],,,.LWD[J].,2009,36(5):617622.LiFangming,TianZhongyuan,JiangAming,etal.PredictionofreservoirdepletiondegreeandproductionGORusingloggingwhiledrillingdata[J].PetroleumExplorationandDevelopment,2009,36(5):617622.[10],.[J].,2008,35(5):595599.LiChaoliu,ZhouCancan.Quantitativeevaluationontheheterogeneityofclasticrockbywirelinelogs[J].PetroleumExplorationandDevelopment,2008,35(5):595599.:张涛(1982),女,山东东营人,现为中国石油大学(华东)在读博士研究生,主要从事测井地质学及油藏描述研究地址:山东省东营市北二路271号,中国石油大学(华东)地球资源与信息学院,邮政编码:257061Email:[e-mail]:20080408:20100725()582∃Vol.37No.5