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声电转换    
相关语句
  sonic-electric transformation
    QUANTITATIVE ANALYSIS OF RADIATION ENERGY IN BOREHOLE SONIC-ELECTRIC TRANSFORMATION WAVE FIELDS
    井中声电转换波场辐射能量定量分析
短句来源
  sonic-electric transformation
    QUANTITATIVE ANALYSIS OF RADIATION ENERGY IN BOREHOLE SONIC-ELECTRIC TRANSFORMATION WAVE FIELDS
    井中声电转换波场辐射能量定量分析
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  acoustoelectric conversion
Sources of acoustoelectric conversion in concretes
      
Acoustoelectric conversion in concretes is investigated by physical modeling methods.
      
An investigation of the temporal and spectral characteristics of acoustoelectric conversion in model and real concretes confirms the calculations.
      


When an acoustic point source on the borehole axis emits an acoustic wave,an electric field as well as an acoustic field is generated in the porous formation around the borehole due to electrokinetic effect.Two kinds of electric fields can be received on the borehole axis.The propagating electromagnetic wave arrives at different receivers almost at the same time,and appears as the first wave packet in each full electric field waveform.Another kind of electric fields accompanies the acoustic wave,and consists...

When an acoustic point source on the borehole axis emits an acoustic wave,an electric field as well as an acoustic field is generated in the porous formation around the borehole due to electrokinetic effect.Two kinds of electric fields can be received on the borehole axis.The propagating electromagnetic wave arrives at different receivers almost at the same time,and appears as the first wave packet in each full electric field waveform.Another kind of electric fields accompanies the acoustic wave,and consists of the same component waves as that of the acoustic waveforms,so they are electric fields induced by the acoustic wave in the proximity of the borehole wall near the receiver. A study of the ratio of the magnitude of electric field strength Ez to the magnitude of pressure P,or REP,shows that the compressional wave has the largest REP value,Stoneley wave the next,while the value for the shear wave is the smallest. The electric field in the borehole is not only affected by the coupling coefficient L ,butalso by the wave propagation properties,especially by the waveguide effectof the borehole.The peak value of Ezat1k Hz is about10 0 times as large as thatat10 k Hz,while REP is about5times.Off the borehole axis,there are radial electric component Erand circumferential magnetic component Hθas well as axialelectric component Ez.WhenΛ2 =8K0 α∞ /  is assumed,REP increases rapidly with porosity, decreases with tortuosity,and changes little with permeability.The electric field strength decreases with the borehole fluid salinity and the formation water salinity.

胡恒山 ,王克协 .井孔周围轴对称声电耦合波 :声电效应测井数值模拟 ( ) .测井技术 ,2 0 0 0 ,2 4(1) :3~ 13在流体饱和的孔隙介质中存在声电耦合现象。作者已导出了井中点声源激发时井内、外声场和电磁场的表达式 [1 ] ,在此基础上给出数值算例 ,说明转换电磁场的基本特性 ,分析部分介质参数对声电转换波的影响。当位于井轴上的声源激发声波时 ,在流体饱和的孔隙地层中将不仅产生声波 ,而且产生与之耦合的电磁场。在井中 ,不仅可以接收到来自地层的声波 ,还可以接收到以电磁波速度传播、几乎同时达到不同源距的接收器的“电磁首波”和伴随声波的电磁场。井中接收到的转换电场的强弱 ,不仅取决于地层动电耦合系数 ,还取决于波的传播特性 ,特别是井孔的波导效应。文章考察了电声比与频率、接收位置、孔隙度、渗透率、井内外矿化度等的关系。当从接收声压曲线上可分辨出纵波、横波、斯通利波时 ,从转换电磁场也可以分辨出相应的波包。就电声比而言 ,纵波最大 ,斯通利波次之 ,横波最小。由于低频时动电耦合系数较大 ,更由于低频时斯通利波的激发强度显著增大 ,频率为 1k Hz时斯通利波转换电场的幅度约等于频率...

胡恒山 ,王克协 .井孔周围轴对称声电耦合波 :声电效应测井数值模拟 ( ) .测井技术 ,2 0 0 0 ,2 4(1) :3~ 13在流体饱和的孔隙介质中存在声电耦合现象。作者已导出了井中点声源激发时井内、外声场和电磁场的表达式 [1 ] ,在此基础上给出数值算例 ,说明转换电磁场的基本特性 ,分析部分介质参数对声电转换波的影响。当位于井轴上的声源激发声波时 ,在流体饱和的孔隙地层中将不仅产生声波 ,而且产生与之耦合的电磁场。在井中 ,不仅可以接收到来自地层的声波 ,还可以接收到以电磁波速度传播、几乎同时达到不同源距的接收器的“电磁首波”和伴随声波的电磁场。井中接收到的转换电场的强弱 ,不仅取决于地层动电耦合系数 ,还取决于波的传播特性 ,特别是井孔的波导效应。文章考察了电声比与频率、接收位置、孔隙度、渗透率、井内外矿化度等的关系。当从接收声压曲线上可分辨出纵波、横波、斯通利波时 ,从转换电磁场也可以分辨出相应的波包。就电声比而言 ,纵波最大 ,斯通利波次之 ,横波最小。由于低频时动电耦合系数较大 ,更由于低频时斯通利波的激发强度显著增大 ,频率为 1k Hz时斯通利波转换电场的幅度约等于频率为 10 k Hz时幅度的 10 0倍 ,频率为 1k Hz时斯通利波的电声比约等于频率为 10 k Hz时的 5倍。源

Realization of sonically induced polarization (SIP) logging is based on studies of the borehole SIP effect. This effect is essentially transformation of acoustic waves into electromagnetic waves in two phase porous media, resulting in formation of borehole sonic electric transformation wave fields, and eventually behaves as transformation of acoustic radiation energy into electromagnetic energy. In this paper, through theoretical analysis of the energy components of the sonic electric transformation wave...

Realization of sonically induced polarization (SIP) logging is based on studies of the borehole SIP effect. This effect is essentially transformation of acoustic waves into electromagnetic waves in two phase porous media, resulting in formation of borehole sonic electric transformation wave fields, and eventually behaves as transformation of acoustic radiation energy into electromagnetic energy. In this paper, through theoretical analysis of the energy components of the sonic electric transformation wave fields in two phase porous media, the overall energy composition of borehole sonic electric transformation wave fields is studied. A concept of electrical energy volumetric density of borehole low frequency SIP electrical field is proposed, and its expression is derived. Finally by modeling borehole low frequency SIP electrical fields with real formation parameter models, we have established the relationships between both acoustic frequencies and formation parameters, and electrical energy volumetric density in the borehole low frequency SIP processes. [

井中声激发极化效应研究是实现声激发极化测井实用化的技术基础 ,实质上是声波在双相孔隙介质中向电磁波的转化 ,其结果就是形成井中声电转换波场 ,最终表现为井中声场辐射能向电磁场能的转化 .通过对双相孔隙介质中声激发极化过程声电转换波场能量的理论分析 ,研究了井中声电转换波场能量的总体构成 ,提出了井中低频声激发极化电场电能体密度的概念 ,并推导出具体表达式 .通过采用实际地层参数模型进行井中低频声激发极化电场的模拟计算得到了井中低频声激发极化过程中电能体密度与声波频率与地层参数的相关关系

Electrokinetic experiments are conducted at acoustic logging frequency in model wells with different kinds of formations. One is man made material. The other is full diameter sandstone core from target formation. We observed electric waveforms that accompany the acoustic waves in permeable formations. On the boundary between the permeable formation and another formation, there also exist acoustic waves propagating at a speed of electromagnetic waves....

Electrokinetic experiments are conducted at acoustic logging frequency in model wells with different kinds of formations. One is man made material. The other is full diameter sandstone core from target formation. We observed electric waveforms that accompany the acoustic waves in permeable formations. On the boundary between the permeable formation and another formation, there also exist acoustic waves propagating at a speed of electromagnetic waves. The relative amplitudes of these two kinds of acoustically associated electric fields depend on formation water salinity and differences of borehole fluid salinity. We also observed acoustic waves are converted from alternating electric signal in the formation. The higher the salinity, the weaker the acoustically induced electric field, and hense, the stronger the electrical induced acoustic wave.

模型井实验表明 ,在渗透性孔隙地层包围的井中发射声波时 ,井内不仅可以接收到声波 ,还可以接收到波动电场 ,该电场伴随声波行进。在两种不同地层的分界面处 ,还产生了以电磁波速度传播的电场。这两种转换电场幅度的相对大小 ,与地层水矿化度及其与井中水矿化度差异有关。在井中激励交变电场时 ,井内可以接收到声波。在用实际储层砂岩做成的模型井中 ,也测量到了声 -电转换波和电 -声转换波。随着地层水矿化度增大 ,声 -电转换信号幅度减小 ,电 -声转换信号幅度增大。

 
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