Identifikasi Sebaran Anomali Magnetik pada Daerah Prospek Panas Bumi Nagari Aie Angek, Kabupaten Tanah Datar

Authors

  • Hanif Hidayat 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
  • Dwi Pujiastuti Laboratorium Fisika Bumi, Jurusan Fisika Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Andalas

DOI:

https://doi.org/10.25077/jfu.10.1.48-54.2021

Abstract

Penelitian ini bertujuan untuk mengidentifikasi sebaran anomali magnetik pada daerah prospek panas bumi Nagari Aie Angek untuk mengetahui potensi panas bumi yang digambarkan dalam bentuk pemodelan sistem panas bumi. Penelitian yang dilakukan pada daerah berdimensi 1300 m × 1300 m yang terdiri dari 198 titik pengambilan data. Dari hasil penelitian dapat disimpulkan bahwa nilai anomali magnetik yang berada pada daerah tersebut berada pada rentang -2800 nT hingga 1800 nT dan didominasi oleh nilai magnetik negatif. Anomali magnetik negatif ini disebabkan oleh adanya sumber panas, reservoir dan pengaruh batuan sedimen vulkanik yang telah mengalami demagnetisasi. Data sebaran anomali magnetik ini diplot menjadi peta kontur yang selanjutnya dikontinuasi ke atas (smoothing) untuk menghilangkan pengaruh magnetik pada permukaan dan menekankan pengaruh regional. Berdasarkan hasil pemodelan dari sistem panas bumi didapatkan adanya indikasi caprock, reservoir dan batuan panas serta zona sesar yang berkaitan erat dengan sistem fluida hidrotermal.

 

This research aims to identify the distribution of magnetic anomalies in the Nagari Aie Angek geothermal prospect area and determine the geothermal potential described in geothermal system modeling. This research was conducted in an area with 1300 m × 1300 m, consisting of 198 data collection points. From the research result, the magnetic anomaly values obtained are in the range -2800 nT to 1800 nT and are dominated by negative magnetic values. This negative magnetic anomaly is caused by heat sources, reservoirs, and the influence of demagnetized volcanic sedimentary rocks. This magnetic anomaly distribution data is plotted into a contour map, which is then performed by upward continuation (smoothing) to eliminate magnetic influence on the surface and emphasize regional effects. Based on the geothermal system’s modeling results, it is found that there are indications of caprock, reservoir, and hot rock, as well as a fault zone that is closely related to the hydrothermal fluid system.

References

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Published

2021-02-17

How to Cite

Hidayat, H., Putra, A., & Pujiastuti, D. (2021). Identifikasi Sebaran Anomali Magnetik pada Daerah Prospek Panas Bumi Nagari Aie Angek, Kabupaten Tanah Datar. Jurnal Fisika Unand, 10(1), 48–54. https://doi.org/10.25077/jfu.10.1.48-54.2021

Issue

Vol. 10 No. 1 (2021)

Section

Articles

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