中文摘要：

声、电频谱测井直接测量声和电探头频谱的实部和虚部.通常情况下,实部信号幅度比较大,与地层参数的关系不密切;虚部的信号比较小,与地层声、电参数关系密切.测量时,换能器在井下,地面（或者井下电路）发射频率可调的正弦波或者方波电压于声、电探头,测量其电压和电流波形,处理其幅度和相位可得到探头的阻抗或导纳的实部和虚部.由于位于井下的探头的辐射声阻抗和电阻抗都与地层参数有关,因此,通过测量换能器的阻抗或导纳随频率的变化关系可获得地层的声电参数.与现有的测井方法测量一个频率（感应测井）或者瞬态声波波形（主频附近）不同,声电频谱测井对频率进行扫描,获得一定频率段的频谱.具体的频率区间根据井眼条件和所测量的地层参数以及探头结构确定.声电频谱测井理论建立井眼条件下频谱的实部和虚部与地层参数之间的关系,测井资料处理则利用这些关系从测量的频谱曲线获得所测量地层的声、电参数.该方法可以在裸眼井和套管井中进行,并且还可以像最早的电极测井那样,直接在地面完成测量,井下只放置探头,不设置电路.这时声电频谱测井通过电缆输入到井下探头的是正弦波或者方波,电缆对测量结果影响比较大.本文首先给出声电频谱测井的现场实验结果,然后讨论电缆的频谱特征以及对测量结果的影响.电缆的频谱峰在探头阻抗发生变化的时候变化比较小,容易从频谱测量结果中区分出来.

英文摘要：

Acoustoelectric frequency spectrum logging is a method measuring the real and imaginary parts of frequency spectrum of the acoustoelectric probe.In general,the signal amplitude of real part is relatively large which is not close to the stratum parameter;however,the signal of imaginary part and stratum parameter are close which is relatively small.When measuring,the transducer is in downhole.The circuit（ground or underground）sends a frequency –adjustable sine wave or square-wave voltage to the acoustoelectric probe.The real and imaginary parts of impedance or admittance can be obtained by measuring voltage and current waves and handing amplitude and phase of the probe.As the radiation acoustic impedance and electrical impedance of the probe in downhole are both related to stratum parameters,we can get acoustoelectric parameters of the stratum by measuring the change of impedance or admittance of the transducer along with the frequency.Different with existing logging method measuring a kind of frequency（induction logging）or transient acoustic waveform（near the basic frequency）,acoustoelectic frequency spectrum logging gains spectrum within a certain frequency range by scanning frequency.The specific frequency range can be confirmed according to the wellbore condition,stratum parameters measured and structure of the probe.The theory of acoustoelectric frequency spectrum logging establishes the relationship between the real and imaginary parts of frequency spectrum and the parameter of stratum under borehole condition. When processing logging data, we can obtain acoustoelectric parameters of stratum measured with these relationships from frequency spectrum curve measured.This method can be performed in both an open and cased wells,and even can complete measurement on the ground like the earliest electrode logging,only placing probe in downhole not setting circuit.Here,it is sine wave or square-wave input to probe in downhole through the cable,so the cable has much influence on measurement results. This