STRUKTUR SISTEM PANAS BUMI DAERAH CUBADAK BERDASARKAN PEMODELAN INVERSI 3-D DATA MAGNETOTELURIK
Abstract
Daerah panas bumi Cubadak terletak di Kabupaten Pasaman, Provinsi Sumatera Barat. Keberadaan sistem panas bumi di daerah Cubadak ditandai oleh munculnya mata air panas berupa mata air panas Cubadak, Sawah Mudik, dan Talu dengan temperatur antara 37,1oC dan 74,8oC. Survei magnetotelurik (MT) telah dilakukan oleh Pusat Sumber Daya Mineral, Batubara, dan Panas Bumi, Badan Geologi, di daerah tersebut pada Tahun 2012, yang bertujuan untuk mengidentifikasi sistem panas bumi Cubadak. Penggunaan pemodelan inversi 3-D terhadap data MT diharapkan dapat mendelineasi dengan baik struktur sistem panas bumi Cubadak.
Berdasarkan pemodelan 3-D dihasilkan suatu struktur tahanan jenis, yang memiliki zona rendah (lebih kecil dari 11 Ohm-m) di sekitar manifestasi panas bumi Cubadak dan Sawah Mudik, diinterpretasikan sebagai zona alterasi argilik, masing-masing mulai pada kedalaman 100 meter dan 250 meter, serta bertindak sebagai batuan penudung bagi sistem panas bumi Cubadak. Sementara itu, keberadaan top reservoir dari sistem tersebut diidentifikasi berada di bawah manifestasi Cubadak pada kedalaman 1.000 meter, sedangkan di bawah manifestasi Sawah Mudik pada kedalaman 1.250 meter.
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