CAJ | 학술논문

随钻方位电磁波电阻率成像资料在地质导向中起着至关重要的作用。利用三维有限差分数值模拟方法计算随钻电阻率仪器激发的电磁场随仪器方位变化的规律，分析实现方位电阻率测量以及成像的原理及方法。数值模拟结果表明：在常规随钻电磁波仪器的基础上，增加倾斜或横向接收（发射）天线，可以实现地层方位的预测和判断，同时方位电磁波电阻率成像结果受相对井斜角、地层电导率对比以及地层地质构造的影响；利用方位电阻率成像以及定向信号成像结果可以预测和判断层界面、地层方位特征以及各向异性地层走向；幅度比电阻率成像效果优于相位差电阻率成像；在均匀各向异性介质中，线圈距和工作频率越大，视电阻率受垂向电阻率影响越大；线圈距越大，定向幅度信号越强，能预测的层界面的距离越大。
수찬방위전자파전조솔성상자료재지질도향중기착지관중요적작용。이용삼유유한차분수치모의방법계산수찬전조솔의기격발적전자장수의기방위변화적규률，분석실현방위전조솔측량이급성상적원리급방법。수치모의결과표명：재상규수찬전자파의기적기출상，증가경사혹횡향접수（발사）천선，가이실현지층방위적예측화판단，동시방위전자파전조솔성상결과수상대정사각、지층전도솔대비이급지층지질구조적영향；이용방위전조솔성상이급정향신호성상결과가이예측화판단층계면、지층방위특정이급각향이성지층주향；폭도비전조솔성상효과우우상위차전조솔성상；재균균각향이성개질중，선권거화공작빈솔월대，시전조솔수수향전조솔영향월대；선권거월대，정향폭도신호월강，능예측적층계면적거리월대。
Azimuthal propagation resistivity while drilling imaging data plays important role in geosteering.The electromagnetic field of different tool face has been simulated by three-dimensional finite difference method;the azimuthal resistivity measurement principle and imaging method is then analyzed.The numerical results show that adding tilt or transverse antenna to conventional logging while drilling (LWD)resistivity tools could get azimuth of formation.The imaging is influenced by relative deviation angles,resistivity contrast and geological structure.The imaging data can be used to forecast and determine formation boundaries,azimuth and anisotropic formation strikes.The amplitude ratio resistivity imaging is better than phase shift resistivity.In homogenous anisotropic medium,the larger coils spacing and higher frequency,the greater the influence of vertical resistivity to apparent resistivity.The bigger coil spacing,the stronger directional amplitude signals and the farther prediction distance to formation boundaries.