Studi Pemodelan Respon Polarisasi Terinduksi dalam Kawasan Waktu (TDIP) terhadap Kandungan Mineral Logam, Sebuah Hasil Awal

Abstract

Modelling studies of Time Domain Induced Polarization (TDIP) performed to obtain the relationship between parameters responses to metallic mineral content. This study includes mathematical, forward, physical and inversion modelling. Mathematical modelling is done by solving the Laplace equation to obtain the IP responses. Forward modelling is done by developing a numerical workflow to generate theoretical curves. Physical modelling obtained the data from various parameters of target measurement. TDIP responses that compared with the theoretical curves are the results of mathematical modelling. The best response of IP can be obtained by inversion modelling. TDIP responses measurement by varying target's metallic mineral content is done for understanding the relationship between them. The amplitude of IP responses in forward modelling is determined by target's radius and depth ratio, and ratio of background resistivity and target's resistivity. The higher target's radius and depth ratio, the higher the amplitude. There is a good correlation between TDIP responses to the presence of the target and the possibility of metallic mineral content in target.Keywords : mathematical modelling, forward modelling, physical modelling and inversion modeling ABSTRAK Studi pemodelan Time Domain Induced Polarization (TDIP) dilakukan untuk memperoleh hubungan parameter respon TDIP terhadap kandungan mineral logam. Studi ini meliputi pemodelan matematika, pemodelan kedepan, pemodelan fisis dan pemodelan inversi. Pemodelan matematika pada prinsipnya adalah menyelesaikan persamaan Laplace untuk memperoleh respon IP teoritis. Pemodelan kedepan dilakukan dengan membangun alur numerik untuk menghasilkan kurva-kurva teoritis. Respon TDIP berbagai parameter target pengukuran diperoleh dari pemodelan fisis. Data ukur respon TDIP ini yang akan dibandingkan dengan kurva-kurva teoritis hasil pemodelan matematik. Dengan cara inversi, maka akan diperoleh respon IP yang paling baik. Pengukuran respon TDIP pada variasi kadar mineral logam dalam target dilakukan untuk mengetahui hubungan antara keduanya. Amplitudo respon IP pemodelan kedepan ditentukan oleh rasio jari-jari dan kedalaman target dan rasio resistivitas medium latar dan target. Semakin besar rasio jari-jari dan kedalaman target, maka amplitudo semakin besar. Terdapat korelasi yang baik, antara respon TDIP terhadap keberadaan target dan kemungkinan kandungan besi dalam target.Kata kunci : pemodelan matematik, pemodelan kedepan, pemodelan fisis, inversi

Effectiveness of Laboratory Physical Modeling in Acquiring the Response of Time Domain Induced Polarization (TDIP)

“…The use of physical modeling laboratory to determine the behavior of TDIP responses as metal mineral content in the target was done in the study. Preliminary studies showed that the TDIP response resulting from the measurement of physical models is comparable to the level of iron-ore in the target [5,16]. The use of water as the host medium and block target represents the subsurface properties of the medium.…”