首页|New equipment for high-accuracy laboratory measurements of spectral induced polarization of rock samples in the time- and frequency domains: Testing of laboratory multifunction potentiostat-galvanostat
New equipment for high-accuracy laboratory measurements of spectral induced polarization of rock samples in the time- and frequency domains: Testing of laboratory multifunction potentiostat-galvanostat
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NSTL
Elsevier
The spectral induced polarization (IP) technique is widely used in prospecting and applied geophysics and allows remote assessment of porosity, mineralogical composition, textural and structural features of rocks, and chemical composition of the saturating fluid. The nature of the IP phenomenon in rocks is still not fully understood; therefore, much attention is paid to laboratory IP measurements on rock/ore samples carried out in the time (TDIP) and frequency (FDIP) domains. The intensity of the polarization effect can be low in rocks. Reliable IP measurements on rock samples in a broad time or frequency domain require tailored high-precision equipment. This paper presents the first experience of using the multifunctional electrochemical P-40 x potentiostat-galvanostat instrument for high-precision laboratory measurement of spectral induced polarization (SIP) on rock samples. The advanced capabilities of the P-40 x allowed us to implement a fully automated TDIP and FDIP measurement technology. The difference between the P-40x and specialized equipment for IP measurements in the time domain lies in recording of TDIP signals (full wave) of current and voltage without processing. A code has been developed for processing the observed TDIP signals. It suppresses harmonic and non-harmonic interference signals and the drift of potential electrodes and calculates IP parameters. The code and proposed algorithm for processing TDIP signals were successfully tested on synthetic signals contaminated by noise components of various origins and data from laboratory IP measurements on rock samples. We also compared the TDIP and FDIP measurements obtained with the P-40 x and specialized equipment AIE-2 (TDIP) and SIP Fuchs III (FDIP), which have been used for high-precision laboratory measurements of IP for many years. We run our experiments with such test materials as RC circuit, ore carbonatite samples, and sand. Here we demonstrate that the IP data obtained with the P-40 x and specialized equipment are identical.
Induced polarization (IP)Time-domain IP (TDIP)Frequency domain IP (FDIP)Complex conductivityPolarizability decayFull-wave TDIP signal processingIMPROVEMENT
NSTL
Elsevier
