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斯伦贝谢测井公司新近推出的介电扫描测井(ADT),采用频率在20MHZ~1GHZ范围内变化的4种频率,进行两个发射天线和8个接收天线的阵列交叉发射和接收。利用高频电磁波的频散特性,获得泥饼、钻井液侵入带、过渡带、原状地层四种不同径向探测深度的相对介电常数。由于水的相对介电常数与其它流体和岩石差别很大:水50~80,油2.2~8,天然气1,砂岩4.65,白云岩6.8,灰岩7.5~9.2,石膏6.35等,而且水的相对介电
Schlumberger Logging Company recently introduced dielectric scanning logging (ADT), the use of frequency changes in the range of 20MHZ ~ 1GHZ 4 kinds of frequencies, two transmit antennas and eight receive antenna array cross-launch and receive. By using the dispersion characteristics of high frequency electromagnetic waves, the relative permittivity of four different radial probing depths of mud cake, drilling fluid invasion zone, transition zone and undisturbed formation can be obtained. Since the relative permittivity of water is quite different from other fluids and rocks: water 50-80, oil 2.2-8, natural gas 1, sandstone 4.65, dolomite 6.8, limestone 7.5-9.2, gypsum 6.35, etc., and the relative water Dielectric