声波测井仪器Acoustic Tools 5700.ppt

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1、声波仪器PiezoelectricTransducersT+-RPiezoelectricTransducersTRTRSlownessMeasurementTRACBTRDt=(A+B+C)/TREfficiency….Dataaccuracy….People-orientedserviceSlownessMeasurementTACBR2ReceiverSpacingR1EDDt=TR2-TR1ReceiverSpacingDt=(A+B+D+E)-(A+B+C)ReceiverSpacingDt=DReceiver

2、SpacingAssumingC=EEfficiency….Dataaccuracy….People-orientedserviceToolTiltorCaveBoundaryTR2R1ACDEBTACBR2R1DEEfficiency….Dataaccuracy….People-orientedserviceBoreholeCompensatedSlownessMeasurementT1R2R1T2T1R2R1T2Dt1=T1R2-T1R1ReceiverSpacingDt2=T2R1-T2R2ReceiverSpac

3、ingDt=Dt1+Dt22Efficiency….Dataaccuracy….People-orientedservice6”Dtfrom1Transmitter&4ReceiversTR1R2R3R4TR1R2R3R4TR1R2R3R4TR1R2R3R4TR1R2R3R4SyntheticTransmitterArrayReceiverArray6”Efficiency….Dataaccuracy….People-orientedservice6”Dtfrom1Transmitter&4ReceiversTR1R2R

4、3R4TR1R2R3R4TR1R2R3R4TR1R2R3R4TR1R2R3R4SyntheticTransmitterArrayReceiverArrayTransmitterDtDtTR2-DtTR1=DtR2R1DtTR3-DtTR2=DtR3R2DtTR4-DtTR3=DtR4R3TransmitterDt=DtR2R1+DtR3R2+DtR4R33ReceiverDtDtTR2-DtTR1=DtR2R1DtTR3-DtTR2=DtR3R2DtTR4-DtTR3=DtR4R3ReceiverDt=DtR2R1+Dt

5、R3R2+DtR4R33Dt6”=ReceiverDt+TransmitterDt26”Efficiency….Dataaccuracy….People-orientedserviceCancellationEfficiency….Dataaccuracy….People-orientedserviceDipolevs.MonopoleSWaveReceiverPPSourcePPSWaveSourceReceiverPPPPPWavePWaveSWaveSWaveEfficiency….Dataaccuracy….Pe

6、ople-orientedserviceReceivers-Dipolevs.MonopoleX1X2Y1Y2S-+YDipoleMonopole-+XDipoleREfficiency….Dataaccuracy….People-orientedserviceCrossDipole-ShearWaveSplittingEfficiency….Dataaccuracy….People-orientedserviceDipoleinthePresenceofAzimuthalAnisotropy596117.ppt4+-S

7、1(Fast)DipoleS2(Slow)qNEfficiency….Dataaccuracy….People-orientedservice声波仪器Dipole声波偶极技术可使我们在软地层中像在硬地层中一样测取地层的横波。由于受到井眼、地层物理特性的限制，单极声波测井仪只能在声波传播速度大于井眼流体传播速度的地层（即硬地层）中测取横波速度，但偶极横波成像仪克服了这一缺点，在软地层中同样可以测取横波速度。偶极横波成像仪把新一代的偶极技术与最新发展的单极技术结合在一起，从而提供了当今测量地层纵波、横波和斯通利波的最好方法它

8、解决了慢速地层的横波测量问题Dipole声波使用偶极声源，这种声源是一种定向的压力源，由两个相位相反且耦合在一起的单极声源组成。这种压力源可使井壁产生小的弯曲，因而能在地层中激发弯曲波或挠曲波，它是一种频散现象很强的波，当频率很低时，其速度接近于横波速度，故可在软地层用来代替横波速度。偶极声波测井仪使用了具有方向性的