Monitoring the Muara Laboh Geothermal Field in Indonesia using the ISBAS Method with Sentinel-1 SAR Images

Q2 Pharmacology, Toxicology and Pharmaceutics

Science and Technology Indonesia Pub Date : 2023-10-01 DOI:10.26554/sti.2023.8.4.626-631

Mokhamad Yusup Nur Khakim, Takeshi Tsuji, Erni Erni, Akhmad Aminudin Bama, Frinsyah Virgo, Muhammad Irfan, Azhar Kholiq Affandi, Toshifumi Matsuoka

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Abstract

The Muara Laboh geothermal field lies in a South Solok basin zone, West Sumatra, Indonesia. Production and reinjection of geothermal fluids into the underground reservoir commonly induce crustal deformation. The study area is covered by 63.8% plantation, primary, and secondary forests, which limit the ability of conventional InSAR techniques. Therefore, an Intermittent Small BASeline Subset (ISBAS) analysis has been performed to estimate line-of sight (LOS) displacement time series due to geothermal production using the Sentinel-1 dataset between 8 March 2021 and 15 March 2022. The localized subsidence with ∼30 mm/yr rate over this tropical geothermal field has been revealed by using the ISBAS. The subsidence coincides with an area of the Muara Laboh geothermal reservoir. We suggest that geothermal production induced subsidence. In addition, the deformation in this geothermal field was controlled by faults and seasonally influenced by rainfall. Therefore, deformation variation was correlated with fluctuations in rainfall patterns. The geothermal reservoir system exhibited elastic expansion in response to seasonal recharge events during the rainy season.

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基于ISBAS方法和Sentinel-1 SAR图像监测印度尼西亚Muara Laboh地热田

Muara Laboh地热田位于印度尼西亚西苏门答腊岛南索洛克盆地带。地下储层地热流体的开采和回注通常会引起地壳变形。研究区人工林、原生林和次生林覆盖率为63.8%，这限制了常规InSAR技术的能力。因此，使用2021年3月8日至2022年3月15日期间的Sentinel-1数据集，进行了间歇性小基线子集(ISBAS)分析，以估计地热生产引起的视线(LOS)位移时间序列。利用ISBAS揭示了该热带地热田的局部沉降速率为~ 30 mm/yr。下沉与Muara Laboh地热储层的区域一致。我们认为地热生产引起了下沉。此外，该地热田的变形受断裂控制，并受降水的季节性影响。因此，变形变化与降雨模式的波动相关。在雨季，地热储层系统对季节性补给事件表现出弹性扩张的响应。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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