Abstract:

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.

Key words: amplitude attenuation, phase difference, cross plot, dielectric constant, resistivity, anisotropy