Magnetotelluric-Geochemistry Investigations of Blawan Geothermal Field, East Java, Indonesia

Maryanto, Sukir; Dewi, Cinantya Nirmala; Syahra, Vanisa; Rachmansyah, Arief; Foster, James H.; Nadhir, Ahmad; Santoso, Didik R.

doi:10.3390/geosciences7020041

Cited by 20 publications

(16 citation statements)

References 16 publications

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“…Since 1970, Indonesia has undertaken geothermal explorations in order to discover and develop high-temperature geothermal energy sources [10]. Indonesia contains 13% of the total world's volcanoes, of which 80% are estimated to possess geothermal energy production potential [11]. Those volcanoes are spread over 312 locations [12] with an average estimated geothermal potential of around 28.617 MWe which is equal to 40% of the total world's geothermal potential [13].…”

Section: Introductionmentioning

confidence: 99%

Geochemistry Exploration and Geothermometry Application in the North Zone of Seulawah Agam, Aceh Besar District, Indonesia

et al. 2019

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A geochemistry study has been done in four geothermal manifestations—Ie-Seu’um, Ie-Brôuk, Ie-Jue and the Van-Heutz crater—located in the north zone of Seulawah Agam mountain (Aceh Besar District, Indonesia). The study was performed through water and gas analysis. Water analysis were done for all geothermal manifestations, but gas analysis was only done for the Ie-Jue manifestation that has fumaroles. Cation and anion contents were analyzed by ion chromatography, ICP-OES, alkalimetry titrations, and spectrophotometry, meanwhile isotopes were measured by a Liquid Water Isotope Analyzer. The resulting data were used for fluid and gas geothermometry calculations, and plotted in a FT-CO2 Cross-Plot and a CH4-CO2-H2S triangle diagram to obtain reservoir temperatures. The data were also plotted by a Cl-HCO3-SO4 triangle and Piper diagram to obtain the water type and dominant chemical composition, a Na-K-Mg triangle diagram to obtain fluid equilibria, the isotope ratio in the stable isotope plot to obtain the origin of water, and a N2-He-Ar triangle diagram to establish the origin of fumaroles. The water analysis results showed that (1) Ie-Seu’um has an average reservoir temperature of 241.9 ± 0.3 °C, a chloride water type, a dominant Na-K-Cl chemical composition, a mature water fluid equilibrium, and water of meteoric origin; (2) Ie-Brôuk has an average reservoir temperature of 321.95 ± 13.4 °C, a bicarbonate water type, a dominant Na-Ca-HCO3chemical composition, an immature water fluid equilibrium, and water of meteoric origin; (3) Ie-Jue has an average reservoir temperature of 472.4 ± 91.4 °C, a sulphate water type, a dominant Ca-SO4 chemical composition, an immature water fluid equilibrium and water of meteoric origin; and (4) the Van-Heutz crater has an average reservoir temperature of 439.3 ± 95.3 °C, a sulphate water type, a dominant Ca-SO4 chemical composition, an immature water fluid equilibrium and water of magmatic origin. The results of our gas analysis showed that Ie-Jue has an average reservoir temperature of 258.85 °C, and water of meteoric origin. Based on the reservoir temperatures, the geothermal manifestation of the north zone of Seulawah Agam mountain is considered as a high-temperature geothermal system suitable for power plant development.

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Section: Introductionmentioning

confidence: 99%

Geochemistry Exploration and Geothermometry Application in the North Zone of Seulawah Agam, Aceh Besar District, Indonesia

et al. 2019

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“…China is currently the world's largest coal miner, and it is also the largest consumer of coal in the world [1][2][3][4][5][6]. The start of the 21st century was a golden era for the coal sector, and the rapid expansion of coal firms led to huge profits [7,8].…”

Section: Introductionmentioning

confidence: 99%

Application of Transient Electromagnetic Method for Investigating the Water-Enriched Mined-Out Area

Liu

et al. 2018

Applied Sciences

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The water-enriched mined-out area, which led to frequent accidents and the serious destruction of ecological environment and serious threat to coal-mining practices. To ensure safe mining practices and to avoid the intrusion of water from the bases of coal deposits, the detection of the mined-out areas, especially the water-filled mined-out area in advanced, is one of the most important issues. This research focuses on detecting mined-out area enriched by water with the large-loop transient electromagnetic method. Data acquisition system was arranged along 23 survey lines, and the total of 1975 survey points were recorded. An inversion technique was used to interpret the TEM data. The inversion results suggested that the mined-out areas enriched by water always exhibit a very low-resistivity, the resistivity contour present closed circle sharp. There are three main water enriched mined-out areas, named JS1, JS2, and JS3 in the north part of the survey area, as well as three main water weak-enriched areas named RJS1, RJS2 and RJS3 in the west and southwest part of the survey area can be inferred by TEM, the interpretation results were verified by drilling. Large loop TEM is proved as an efficient way to investigate water enriched mined-out areas under the rugged topography conditions, and this work provides more detailed geological information to the coal mining enterprise for further coal-mining practices safety arrangement.

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“…One of the biggest natural resources in Indonesia is Geothermal resources. Indonesia has about 265 existing geothermal energy potential that located in 138 locations, however only seven geothermal location that have been utilized optimally [1]. Geothermal energy is an attractive choice to provide future electricity needs, another advantage of this energy does not affect pollution to the environment [2].…”

Section: Introductionmentioning

confidence: 99%

“…Generally, based on the geological structure the geothermal system in Indonesia consists of five types. Meanwhile, the largest geothermal energy potential are the volcano complexes and grabencaldera volcanic cones [1]. Kasinan and Songgoriti are the areas that have the geothermal potential, it was identified by the presence of the hot springs.…”

Section: Introductionmentioning

confidence: 99%

Magnetic method used in geothermal reservoirs identification in Kasinan-Songgoriti, East Java, Indonesia

Mawarni¹,

Maryanto²,

Nadhir³

2018

EESRJ

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The magnetic method had been applied to identify the geothermal reservoirs in Kasinan-Songgoriti, East Java, Indonesia. The magnetic survey was performed using PPM G-856 and measured on 75 magnetic stations with spacing between each station is 200 meters. The magnetic stations cover of two main hot spring in Kasinan and Songgoriti. The magnetic data were processed by 2D and 3D data modeling. The result of the research showed the range of total magnetic intensity TMI from 31.0 nT to 1207.5 nT. The residual anomaly contour map revealed that geothermal reservoir was suspected tend to lie in an area with the low magnetic intensity value around the hot spring and identified as the volcanic breccia. Based on the integrated of 3D inversion and 2D forward modeling data analysis can be obtained the distribution of reservoirs location, depth and the thickness of the geothermal reservoir, the suspected of the presence of secondary structure, the fluid flow pattern from reservoir to the manifestation on the surface, and also Kasinan-Songgoriti geothermal system continuity retrieval.

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Magnetotelluric-Geochemistry Investigations of Blawan Geothermal Field, East Java, Indonesia

Cited by 20 publications

References 16 publications

Geochemistry Exploration and Geothermometry Application in the North Zone of Seulawah Agam, Aceh Besar District, Indonesia

Geochemistry Exploration and Geothermometry Application in the North Zone of Seulawah Agam, Aceh Besar District, Indonesia

Application of Transient Electromagnetic Method for Investigating the Water-Enriched Mined-Out Area

Magnetic method used in geothermal reservoirs identification in Kasinan-Songgoriti, East Java, Indonesia

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