Investigating Induction Log response in the presence of natural fractures

The present study showed that all characteristics of fractures influence the Induction Log measurements in different degrees. Among them, fracture's conductivity is the most controversial one. For less conductive fractures than matrix, the fracture conductivity has minor impact on the bulk conductivity; however, when fracture to matrix conductivity ratio reaches 10-1000, the bulk conductivity increases to above the actual conductivity of the matrix. In very high conductive fractures, when fracture to matrix conductivity ratio is 10+3 to 10+6, fractures have adverse impact on the bulk conductivity, and the recorded conductivity rapidly decreases below the actual conductivity of matrix. The effect of fracture length and aperture on the Induction Logs is somehow similar. The model showed that fracture inclination has minor impact on the Induction Log's response.