Abstract
The spectral induced polarization (SIP) method can provide apparent complex resistivity based on measurements of multi frequency. SIP method also can provide more detail information about physical properties of rocks and minerals because SIP can give spectral parameters or Cole-Cole parameters such as, changeability (m), time constant (τ) and frequency dependence (c). An Experimental study in laboratory has been conducted to knowing the SIP response of some test sample. The measurement system is built with digital oscilloscope Pico ADC-100 as device for sampling the input and output voltage. Amplifier is used to doubled up the signal and input differential. The range frequency of measurement is 10−2 Hz - 103 Hz. Porouspot Cu − CuSO4 is used to minimize the polarization at potential electrode. A Matlab listings is used to calculate the response of impedance and phase. The result from calibration that used the parallel circuit RC indicate that the measurement system was good. SIP response of porous model indicate that the response form an asymptotic resistivity, and the peak of phase is in the range frequency where the dispersion happen. The result also indicate that resistivity of small grain size model is larger than the big grain size model. Result from sample of mineralized rocks did not indicate a perfect SIP response, it is influenced by the contact between mineral and water was minimum.
Highlights
Abstrak: Metode polarisasi terinduksi spektral atau spectral induced polarization (SIP) adalah metode yang dapat memberikan resitivitas kompleks semu berdasarkan pengukuran multi frekuensi
provide apparent complex resistivity based on measurements of multi frequency
An Experimental study in laboratory has been conducted to knowing the SIP response of some test sample
Summary
Metode polarisasi terinduksi spektral atau spectral induced polarization (SIP) adalah metode yang relatif baru dalam eksplorasi geofisika. Metode SIP dapat memberikan resitivitas kompleks semu berdasarkan pengukuran multi frekuensi (dalam orde 10−2 hingga 102 Hz) dengan menggunakan konfigurasi dari survei resistivitas konvensional. Namun karena metode ini masih terbilang baru, buku-buku maupun publikasi dari tulisan ilmiah yang membahas metode SIP ini relatif masih sedikit dibandingkan metode metode lainnya yang sudah lama berkembang, khususnya tulisan mengenai studi eksperimental SIP di laboratorium masih terbilang jarang. Studi eksperimental di laboratorium sangat perlu dilakukan, karena dari sistem pengukuran dan hasil yang diperoleh akan menjadi dasar penerapan di lapangan. Oleh karena itu untuk metode SIP ini perlu dilakukan eksperimen terhadap beberapa sampel batuan atau model untuk diteliti respon SIP-nya. Agar dapat melakukan eksperimen terhadap respon SIP diperlukan suatu sistem pengukuran yang benar, baik peralatan yang digunakan maupun tahapan kerja penilitan. Oleh karena itu pembuktian apakah sistem pengukuran sudah benar juga harus dilakukan
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