Penentuan Karakteristik Fluida dan Estimasi Temperatur Reservoir Panas Bumi di Sekitar Gunung Talang

Authors

  • Zulinira Dwi Utami Laboratorium Fisika Bumi, Jurusan Fisika Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Andalas
  • Ardian Putra Laboratorium Fisika Bumi, Jurusan Fisika Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Andalas

DOI:

https://doi.org/10.25077/jfu.7.2.130-137.2018

Abstract

Telah dilakukan penelitian penentuan karakteristik fluida dan estimasi temperatur reservoir panas bumi di sekitar Gunung Talang sebagai salah satu tahap awal penentuan pengembangan sistem panas bumi di Kabupaten Solok, Sumatera Barat. Penelitian mengambil sampel 12 titik mata air panas sebanyak 100 ml di sekitar Gunung Talang. Penentuan karakteristik fluida panas bumi dilakukan menggunakan diagram segitiga Na-K-Mg dan Cl-Li-B. Diagram Na-K-Mg digunakan untuk menentukan keseimbangan fluida reservoir panas bumi. Diagram segitiga Cl-Li-B digunakan untuk menentukan asal-usul, pendidihan, dan pengenceran fluida reservoir panas bumi. Estimasi temperatur reservoir dilakukan dengan persamaan geotermometer. Pengukuran unsur Na, K, dan Mg dilakukan dengan alat Atomic Absorption Spectroscopy (AAS). Pengukuran unsur Li, B dan Ca dilakukan dengan alat Inductively Coupled Plasma-Atomic Emission Spectroscopy (ICP-AES) dan pengukuran senyawa SiO2 dengan alat Visible Spectroscopy. Pengukuran unsur Cl dengan metode titrasi asam basa. Hasil penelitian menunjukkan bahwa semua mata air panas bumi di sekitar Gunung Talang berada pada immature water yang menandakan fluida reservoir panas bumi telah mengalami pengenceran dengan unsur lain. Fluida reservoir berasal dari sistem hidrotermal baru yang dipengaruhi oleh magma Gunung Talang. Sistem panas bumi di sekitar Gunung Talang didominasi air dan mata air panas keluar pada zona outflow. Pendidihan fluida reservoir panas bumi berada di bawah permukaan bumi hingga kedalaman sekitar 150 meter. Estimasi temperatur reservoir panas bumi dengan geotermometer silika adalah 147,63 oC - 179,77 oC, yang termasuk dalam sistem panas bumi bertemperatur sedang.

Kata kunci : diagram segitiga, Gunung Talang, reservoir panas bumi.

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Published

2018-04-02

Issue

Vol. 7 No. 2 (2018)

Section

Articles

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Copyright (c) 2018 Zulinira Dwi Utami, Ardian Putra

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