Delineation of Recharge and Discharge Area for Geothermal Energy in Natar

Iqbal, Mochamad; Ashuri, Wijayanti; Juliarka, Bella Restu; Farishi, Bilal Al; Harbowo, Danni Gathot

doi:10.1088/1755-1315/258/1/012036

Cited by 3 publications

(2 citation statements)

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“…Additionally, travertine deposit was found surrounding the discharge (Suharno et al, 2012). The study of recharge area by analysing DEM/topographic map is also been done by Iqbal et al (2018) which shows that the recharge area of Natar and Cisarua are lied at the southern part of Metro-Kotabumi Groundwater Basin and around Mt. Pesawaran, Mt.…”

Section: Introductionmentioning

confidence: 99%

Hydrogeochemistry of Natar and Cisarua Hot springs in South Lampung, Indonesia

Iqbal

Juliarka

Ashuri

et al. 2019

J. Geoscience Eng. Environ. Technol.

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Natar Hot Spring is one of the geothermal manifestations that is located in Lampung Province, Indonesia. About 6 km to the east, another hot spring appears with temperature around 40°C with neutral pH called Cisarua Hot Spring. The Natar Hot Spring itself having temperature 47-54°C with 6.23 pH. Based on the geologic map, the appearance of these hot spring is caused by Lampung-Panjang Fault which trending northwest-southeast. Morphology of the research area is showing a flat terrain topography which composed of Quaternary volcanic rock and metamorphic rock in the basement. The nearest volcano that expected to be the heat source of the geothermal system is the Quaternary extinct volcano called Mt. Betung which is located about 15 km to the southwest. The aim of the study is to analyze the geochemistry of the manifestations and calculate the reservoir temperature. Geochemistry analysis result shows both manifestations are bicarbonate which is formed as a steam-heated water or steam condensates. Geothermometer calculation shows that the geothermal reservoir has temperature 150-160°C with approximately 300 m in depth. All manifestations are originated from meteoric water according to stable isotope analysis D and δ18O data and interacting with carbonate-metamorphic rock beneath the surface based on 13C isotope value. A further geophysics study is needed to determine where the heat comes from.

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Section: Introductionmentioning

confidence: 99%

Hydrogeochemistry of Natar and Cisarua Hot springs in South Lampung, Indonesia

Iqbal

Juliarka

Ashuri

et al. 2019

J. Geoscience Eng. Environ. Technol.

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“…According to this research, the high anomaly under Mount Way Panas was interpreted as a tertiary intrusion of granite rocks, while the low anomaly in the northern part was interpreted as a quarter diorite intrusion, which was interpreted as a heat source. Furthermore, Iqbal et al (2019b) about the delineation of recharge and discharge areas in the Natar Geothermal System. According to this research, the recharge area of the Natar Hot Springs is in the Western and Southern parts of the Metro-Kotabumi Groundwater Basin.…”

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confidence: 99%

Subsurface Survey of Cisarua Lampung Hot Springs Using Geochemical and Gradio-Magnetic Method

Rizki

Ashuri

Hakim

et al. 2022

JGE

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The subsurface survey was carried out in Cisarua Hot Springs, South Lampung. Cisarua Hot Springs has a neutral pH and a temperature of about 44 °C. A combination of geochemical and gradio-magnetic methods was used in this research. This research identifies the characteristics of the Cisarua Hot Springs, estimates reservoir temperature, and creates a subsurface model to determine the hot fluid distribution in the study area. According to the geological data, the manifestation of these hot springs correlates with the Lampung-Panjang Fault. The geochemical results show that this type of hot springs fluid is bicarbonate water, and the reservoir temperature is estimated to be around 160 °C. The low gradio-magnetic anomaly is correlated with the distribution of subsurface hot water flow, according to the 3D model of the gradio-magnetic method. The distribution of subsurface hot fluids is in the middle to the eastern part of the research area.

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