Feasibility of Natural Source Induced Polarization

Abstract

Based on the analysis of existing observation schemes for natural source induced polarization (NSIP) and on the numerical modeling results of two‐dimensional geoelectrical sections with horizontal and vertical electrical non‐uniformity, it is pointed out that the MT anomaly produced by the conductive and electromagnetic effects is overwhelming superiority to the IP anomaly produced by the induced polarization effects. It is very difficulty to pick up the weak IP anomaly which is inundated in the strong EM anomaly. The existing observation schemes for NSIP are not of universal feasibility. The practical application prospects of NSIP are not optimistic. The control source IP with long offset is intrinsically same as NSIP. They are both taking IP observation in the “far zone of electromagnetic field”. So its practical application prospects are not optimistic either.

Research on Induced Polarization Effect of Frequency‐Domain Electromagnetic Sounding of Electric Dipole Source

“…(16), φ low and φ high respectively stands for the phase in low and high frequency. Table 5, by employing the definition from the expression (11) to (16), is the parameter value for model G in Table 1 which characterizes the ability of induced polarization effect. The low and high frequency respectively takes 100 Hz and 1000 Hz when calculating ρ PFE2 , B T1 , B T2 .…”

The Integral Equation of the Micro-Fracture's Electrical Logging Response

“…Basic integral equation. On the condition that boundaries surfaces present surfaces of instrument, wall of a well and fracture, the basic integral equation of electric log [1,2]…”

“…In the real carbonate reservoir, the fracture opening (the fracture's width) is usually small [1][2][3][4], and measured by several tens of micron even several microns. At present the finite element method is mostly employed in the logging numerical simulation.…”

Forward Simulation Results of CSAMT Data on Considering IP Effect

“…Erika and Morrison (2001) studied the same research as Chen and come up with the significant conclusion as well [5] . The MT anomaly led by geoelectric inhomogeneity is much larger in magnitude than that of IP effect so it is inaccessible to get the IP information from data of prominent induction and electromagnetic effect, which means the application is not available now [6] . Theoretical MT studies have shown that the result of conducting MT survey with natural source is significant, which is validated by the experiment they finished in some lead and zinc mine area [7] .…”