Controls on the Karaha–Telaga Bodas geothermal reservoir, Indonesia

Němčok, Michal; Moore, Joseph N.; Christensen, Chelsea; Allis, Rick; Powell, Thomas S.; Murray, A. Brad; Nash, Greg

doi:10.1016/j.geothermics.2006.09.005

Cited by 31 publications

(15 citation statements)

References 26 publications

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“…This feature is found in other geothermal fields in Java. Layman et al (2002) recognize three centres at Dieng, multiple centres (referred to as cells) are suggested for Karaha-Telega Bodas (Nemčok et al, 2007) and two geothermal centres are recognized at Awibengkok (Hulen and Anderson, 1998).…”

Section: Extent Of the Wayang Windu Geothermal Fieldmentioning

confidence: 99%

Overview of the Wayang Windu geothermal field, West Java, Indonesia

Bogie¹,

Kusumah²,

Wisnandary³

2008

Geothermics

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Section: Extent Of the Wayang Windu Geothermal Fieldmentioning

confidence: 99%

Overview of the Wayang Windu geothermal field, West Java, Indonesia

Bogie¹,

Kusumah²,

Wisnandary³

2008

Geothermics

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“…The generation of these thermal fractures augments the permeability of the rock (Browning et al, 2016;Eggertsson et al, 2018;Heap, Lavallée, et al, 2014;Kendrick et al, 2013). Hydrothermal fluids and heat input may also dissolve or break down rock-forming minerals, thus creating additional permeable porous pathways for fluid flow (e.g., Cant et al, 2018;Farquharson et al, 2019;Heap et al, 2012;Kanakiya et al, 2017;Nemčok et al, 2007). Alternatively, hydrothermal fluids may induce the precipitation of minerals (e.g., clays, salts, carbonates, and silica polymorphs) within the pores and cracks (e.g., Rowland & Sibson, 2004;Griffiths et al, 2017;Kanakiya et al, 2017) and thereby decrease permeability (e.g., Heap et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Increasing the Permeability of Hydrothermally Altered Andesite by Transitory Heating

Mordensky

Kennedy

Villeneuve

et al. 2019

Geochem Geophys Geosyst

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Changes in permeability can impact geological processes, geohazards, and geothermal energy production. In hydrothermal systems, high‐temperature heat sources drive fluid convection through the pore network of reservoir rocks. Additionally, thermal fluctuations may induce microfracturing and affect the mineralogical stability of the reservoir rock, thus modifying the fluid pathways and affecting permeability and strength. This study describes the results of thermal heating events lasting several hours on a “moderately altered” plagioclase‐clinochlore‐calcite‐quartz andesite and a “highly altered” plagioclase‐clinozoisite‐quartz‐clinochlore andesite from the Rotokawa Geothermal Field, New Zealand. We use a low thermal gradient (~1.2 °C/min) in an H2O‐saturated, 20‐MPa pressure environment to constrain changes in petrophysical properties associated with transitory thermal phenomena between 350 and 739 °C. As the treatment temperature increases, the mass reduces, while porosity and permeability increase. These effects were greater in the “moderately altered” andesite than in the “highly altered” andesite. Microfracturing is responsible for these changes at lower temperatures (e.g., ≤400 °C). At higher temperatures (e.g., >400 °C), microfracturing remains partially responsible for these rock property changes (e.g., higher permeability); however, these changes are also a product of clinochlore, quartz, and (when present) calcite reacting out of the altered andesite, and increasing porosity. We propose that at temperatures >400 °C, volumetric phase changes associated with heat‐driven reactions in a wet environment can contribute to microcracking and porosity/permeability changes. Our data support observations where high‐temperature conditions at the margins of magma bodies can be associated with substantial increased permeability and decreased strength.

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“…4). Increased concentrations of F − , Cl − , and SO 4 2− in lake water indicate that the fluid in this area is affected by magmatic gas (Nemcok et al 2007) which showed an upflow zone of the geothermal system. Based on the fluid inclusion analysis results, K-TB has different hydrothermal environment conditions where fluid trapped are enriched in Fig.…”

Section: The Fluid Geochemistrymentioning

confidence: 91%

“…3. As stated Nemcok et al (2004), Nemcok et al 2007), fluid flow in the reservoir is mainly controlled by faults; therefore, the southern and central regions have better permeability (Brehme et al 2016;Perez-Flores et al 2017). Furthermore, Moore et al 2000, 2002a, b, c, Moore et al 2004 explain that based on petrographic studies and fluid inclusions from several drill samples, the evolution of the liquid dominated system at high temperatures turned into steam dominated.…”

Section: Geological Reviewmentioning

confidence: 99%

The development study of Karaha–Talaga Bodas geothermal field using numerical simulation

2019

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Background The Karaha-Talaga Bodas (K-TB) geothermal field was declared commercially operated in April 2018 with a capacity of 30 MW. This geothermal field is located on a ridge trending north-south to the north of Mount Galunggung, West Java, Indonesia (Fig. 1). The first exploration program of the K-TB geothermal field was conducted in December 1994 by Karaha Bodas Company (KBC). Nineteen shallow-slim and twelve full-sized wells had been drilled by 1998, and by 2010, 14 total full-sized wells had been drilled in the K-TB field (GeothermEx 1998). The K-TB field consists of two parts: the northern part (the Kawah Karaha area) and the southern part (the Talaga Bodas area). The K-TB field is estimated to have large geothermal potential with a partially steam-dominated system and temperatures reaching Abstract A numerical simulation study of the Karaha-Talaga Bodas geothermal field was carried out to assess the resource and to analyze and predict reservoir behavior under various development scenarios. The three-dimensional natural state model of the Karaha-Talaga Bodas field has been validated with the pressure and temperature of seven wells and the conceptual model of the field. This study explores the application of an experimental design and response surface method for capturing relevant uncertainties existing in the geothermal reservoir simulation; thus, the results of this approach are the assessment of probabilistic resources. The power potential calculated from reservoir simulation results is used to develop proxy equations and then Monte Carlo simulations were applied on proxy models to produce probabilistic distributions of power potential output. Based on Monte Carlo Simulation, the probabilistic power capacity of Karaha-Talaga Bodas field is 120 MW as P50. This model is also used to estimate potential field responses based on two different field development scenarios. Forecasting two development scenarios shows that the best development is 60 MW with a make-up well strategy drilled in the deep-water zone. This scenario requires the number of production, injection, and make-up wells to be 11, 3, and 4, respectively. The reservoir response shows that the pressure drop is between 0.2 and 0.6 bar/year while the temperature drop is 2-14 °C for 30 years.

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Controls on the Karaha–Telaga Bodas geothermal reservoir, Indonesia

Cited by 31 publications

References 26 publications

Overview of the Wayang Windu geothermal field, West Java, Indonesia

Overview of the Wayang Windu geothermal field, West Java, Indonesia

Increasing the Permeability of Hydrothermally Altered Andesite by Transitory Heating

The development study of Karaha–Talaga Bodas geothermal field using numerical simulation

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