随钻电磁波测井数据处理新方法

在有限元素法分析的基础上，根据图版中数据对(地层视电阻率,介电常数)和(幅度衰减,相位差)之间的对应关系，给出了一种采用交汇解释图版的方法,可把随钻电磁测量的相位差和幅度衰减同时转换为地层视电阻率和地层介电常数。同时，通过三维数值模拟不同地层模型的仪器响应，系统地分析了地层各向异性、地层倾角和地层厚度等环境因素对随钻电磁测量视电阻率的影响,结果表明,地层倾角越小，地层厚度越大，测量结果也就越准确。同时绘制了相应的校正解释图版。

A Novel Approach for Electromagnetic Logging While Drilling Data Processing

A novel method is proposed to explore both the dielectric constant and the apparent resistivity from the cross plot of phase difference and amplitude attenuation based on the relationship between (apparent resistivity, dielectric) and (amplitude, attenuation) in chart by using finite element method. Using FEM as the numerical solution for 3D layered media, we have investigated LWD(logging while drilling) response affected by anisotropic properties, layered dip and thickness：the smaller layered dip, the larger thickness, the more accurate measurement result. At the same time, the corresponding correction charts are plotted for EM LWD interpretation.