DOI: https://doi.org/10.14710/jgt.6.3.2023.186-202

Aplikasi Tensor Fase Data Magnetotellurik untuk Pemodelan Panas Bumi The Geysers, California dan Dikorelasikan dengan Data Gaya Berat

Program Studi Teknik Geofisika, Fakultas Teknologi Industri, Institut Teknologi Sumatera, Jl. Terusan Ryacudu, Way Huwi, Kec. Jati Agung, Kabupaten Lampung Selatan, Lampung 35365, Indonesia

Received: 30 Nov 2023; Revised: 15 Jan 2023; Accepted: 16 Jan 2024; Available online: 16 Apr 2024; Published: 16 Apr 2024.
Open Access Copyright (c) 2024 Jurnal Geosains dan Teknologi under http://creativecommons.org/licenses/by-sa/4.0.

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Abstract
Lapangan panas bumi The Geysers terletak di antara dua sesar strike-slip yang tidak aktif, yaitu Sesar Mercuryville dan Collayomi berarah barat laut tenggara. Bagian barat laut The Geysers merupakan lokasi proyek Enhanced Geothermal System (EGS), karena pada area ini lokasi zona reservoir memiliki suhu yang tinggi mencapai 400 °C dengan kedalaman sekitar 2,6 km di bawah permukaan. Penelitian ini bertujuan untuk mengetahui struktur dan kondisi bawah permukaan barat laut The Geysers menggunakan analisis tensor fase data magnetotellurik dan dikorelasikan dengan data gaya berat. Analisis tensor fase digunakan untuk mengetahui arah geoelectrical strike yang timbul akibat adanya ketidakhomogenan konduktivitas listrik secara lateral di Bumi dan memberikan informasi tentang kondisi bawah permukaan. Arah geoelectrical strike pada daerah penelitian diperoleh sekitar N145°E. Clay cap diidentifikasi memiliki nilai resistivitas <30 Ohm.m dengan kedalaman 0,2 km dan ketebalan 0,8 – 1 km, batupasir graywacke merupakan reservoir utama pada daerah penelitian memiliki nilai resistivitas 30 – 90 Ohm.m dengan kedalaman 1 km dan ketebalan 0,4 – 1,8 km, serta terdapat area yang lebih resistif dengan nilai resistivitas 90 – 300 Ohm.m pada kedalaman 1,5 – 2 km merupakan batuan metagraywacke. Peningkatan temperatur reservoir pada kedalaman 2,6 km diduga karena adanya peran dari batuan metagraywacke sebagai Hot Dry Rock Reservoir (HDR).
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Keywords: The Geysers; magnetotellurik; tensor fase; gaya berat; hot dry rock reservoir
Funding: Institut Teknologi Sumatera

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