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44th European Physical Society Conference on Plasma Physics, EPS 2017

作者： Dela Cruz, C.J.M. Vasquez, M.R. Bo-ot, L.M.T. Energy Engineering Graduate Program College of Engineering University of the Philippines Quezon City Philippines Deparment of Mining Metallurgical and Materials Engineering College of Engineering University of the Philippines Quezon City Philippines College of Architecture University of the Philippines Quezon City Philippines

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Approach for Pre-Feasibility Study of Medium Enthalpy Geothermal Field, Case Study: Danau Ranau, Indonesia 9

Approach for Pre-Feasibility Study of Medium Enthalpy Geothe...

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9th ITB International Geothermal Workshop 2020, IIGW 2020

作者： Rera, Gladiez Florista Pratama, Heru Berian Saptadji, Nenny Miryani Geothermal Engineering Master's Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha 10 Bandung40132 Indonesia Jalan Trunojoyo No. 135 Jakarta Indonesia

The development of geothermal fields in Indonesia is carried out under the provisions of the applicable laws and regulations, namely Geothermal Law No. 21 of 2014 and Environmental Protection and Management Law No. 32 of 2009. Based on Law No. 21 of 2014, geothermal business activities consist of preliminary surveys, exploration, and exploitation. After the exploration phase (a detailed geological, geochemical, and geophysical study), a pre-feasibility study is needed to determine the feasibility of exploration drilling. The pre-feasibility study is done to manage project risks. Danau Ranau geothermal field is one of the 166 medium enthalpy geothermal prospects in Indonesia. Activities carried out in this field were geoscience studies. This research was conducted to determine how feasible the Danau Ranau medium enthalpy geothermal field was developed for direct and indirect utilization by looking at the acceptance of technical, financial, environmental, and risk studies. The study can be a tool for the developer to decide whether to continue the next development stage. The result shows that applying the approach for Danau Ranau Geothermal Field is feasible to develop with consideration. Plant of Development by cascade model with leveling utility of energy for Danau Ranau Geothermal Field shows optimal value both in the operational and financial sides. The first level is technically designed for electricity with ORC conversion technology and the cascade level for indirect use by Lindal Diagram and community empowerment in economic and social. In financial analysis, the cascade model has optimum profitability value expressed in NPV and equity IRR. © Published under licence by IOP Publishing Ltd.

关键词： Enthalpy

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Productive Structural Geology in Volcanogenic System: A case study of Lumut Balai Geothermal Field, Indonesia 9

Productive Structural Geology in Volcanogenic System: A case...

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9th ITB International Geothermal Workshop 2020, IIGW 2020

作者： Nurseto, Sapto Trianggo Julia Satriani, R.A. Thamrin, Mochamad Husni Suryantini, N. PT. Pertamina Geothermal Energy Indonesia Geothermal Engineering Master's Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha 10 Bandung40132 Indonesia

Lumut Balai is geothermal field that occurs in the caldera system, named Lumut Tua Caldera, approximately 9 km in diameter. Located in Penindaian Village, Muara Enim Regency, South Sumatra Province. Lumut Balai is one of the fields operated by Pertamina Geothermal Energy. The volcanism in Lumut Balai is closely related to the Sumatra Fault Systems activity. Surface data such as outcrops provide information regarding lithology, alteration type, and geological structures, while manifestations provide fluid geochemistry data. Subsurface data are acquired from rock cuttings and core samples (which are then further analyzed through petrographic analysis and XRD analysis), drilling parameters, and borehole image logging. These provide information and interpretation of subsurface geological conditions such as lithology distribution, alteration distribution, reservoir zone, heat source, and permeability. The methods above result in an interpretation of the Lumut Balai geological model. Lumut Balai is a geothermal system located within the Lumut Balai caldera, composed of andesite, andesite breccia, basaltic andesite, basalt, limestone, meta-sediment, tuff, and tuff breccia which are all altered to certain extents. There are five stratigraphic units, starting from the oldest to youngest are Tertiary Basement Unit, Pre-Old Lumut Unit, Pre-Caldera Unit, Caldera Unit, and Post-Caldera Unit. Alteration zones in Lumut Balai could be classified into smectite+chlorite zone, silica+chlorite zone, and chlorite+epidote zone. Productive faults in Lumut Balai are Air Ringkih Fault with NE-SW trend, Air Udangan Fault trending NE-SW, Lumut Tua Caldera and Gemurah Besar which trends N-S. This study aims to confirm the productive geological structure in Lumut Balai and gives better understanding for future field development, such as well targeting for makeup wells and reservoir simulation. © Published under licence by IOP Publishing Ltd.

关键词： Geothermal fields

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Structural Geology and Volcanism in Hululais Geothermal Area, Bengkulu, Indonesia 9

Structural Geology and Volcanism in Hululais Geothermal Area...

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9th ITB International Geothermal Workshop 2020, IIGW 2020

作者： Nurseto, Sapto Trianggo Arifin, Muhammad Tajul Pratama, Graniko Reza Nusantara, Vivi Dewi Thamrin, Mochamad Husni Suryantini PT. Pertamina Geothermal Energy Indonesia Geothermal Engineering Master's Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha 10 Bandung40132 Indonesia

Hululais Prospect in Rejang Lebong, Bengkulu is one of the geothermal fields developed by Pertamina Geothermal Energy. The field is situated within the Bukit Barisan Mountain Range, an NW-SE volcanic arc of Sumatra, and located 8 km western from Musi Segment of Sumatra Fault Zone Zone. Based on field data from geological mapping, remote sensing analyses and borehole data these regional structures influence the occurrence of the NW-SE volcanic axis in Hululais Volcanic Complex (HVC). The Hululais Volcanic Complex (HVC) itself is a Quaternary volcanic complex which comprised of six crown units namely: (Bukit Resam, Suban Agung, Bukit Beriti, Bukit Gedang, Bukit Lumut and Bukit Pabuar) with its associated Hummocks and primary/secondary deposits. These NW-SE distributed of Subang Agung, Bukit Beriti and Bukit Gedang volcanic crowns can be grouped as Hululais Brigade. The manifestations distribution in Hululais also depict the influence of the NW-SE geological structure and its volcanic activity. This is validated by the presence of geothermal manifestation such as fumarole in the central of Hululais Volcanic Complex and hot spring in the medial - distal part of the field. © Published under licence by IOP Publishing Ltd.

关键词： Geothermal fields

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Updated Numerical Model of Mataloko Geothermal Field 9

Updated Numerical Model of Mataloko Geothermal Field

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9th ITB International Geothermal Workshop 2020, IIGW 2020

作者： Jatmiko, Bambang Wahyu Pratama, Heru Berian Sutopo Geothermal Engineering Master's Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha 10 Bandung40132 Indonesia Jalan Trunojoyo No. 135 Jakarta Indonesia

Data collection and further geoscience studies have been carried out in the Mataloko area at the end of 2019. In general, the results of the study showed significant differences compared to previous studies. Therefore, it is necessary to update the Mataloko geothermal field's numerical model following the latest studies' data and analysis. In this research, numerical modeling will be performed using a TOUGH2 V.2 simulator and graphical interface software. The model will be built and validated at the natural state phase. It is expected that the model can complement existing geoscience studies and can be used by developers in planning field development. © Published under licence by IOP Publishing Ltd.

关键词： Numerical models

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Production drill optimisation at Telfer Underground - A move towards automation

Production drill optimisation at Telfer Underground - A move...

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10th AusIMM Underground Operators' Conference 2008 - Boom and Beyond

作者： Adams, H.M. Boniwell, P. Knights, P.F. University of Queensland St Lucia QLD 4072 Australia Northern Western Australia Bymecut Mining Pty Ltd. PO Box 205 Cloverdale WA 6985 United States Department of Mining Engineering University of Queensland Program Leader Smart Mining Systems St Lucia QLD 4072 Australia

ISBN: (纸本)9781920806736

This paper investigates the causes of low effective utilisation of the production drill fleet at the Telfer Underground Gold Mine, as measured by the percussion hours per shift. The first part of this paper focuses on a site time and motion study conducted to accurately identify shift time allocation and optimal drilling parameters (manual versus automatic, and suitable flushing mediums for varying ground conditions) as well as quantifying the business potential for automated or remotely operated production drilling. The second part of the paper focuses on the rate of successful hole completion for automated production drilling during shift changes. Two main areas of drill optimisation were identified. Firstly, a site-specific drilling procedure was established so as to ensure that all operators were drilling using optimal parameters. Total production metres per rig increased by 10.7 per cent as a result of the implementation of this standard. It was observed that a 25 per cent faster overall drill cycle was achieved using air mist flushing, and that manual drilling achieves a 19 per cent faster overall drilling cycle in comparison to automated drilling. Secondly, routine provision to the maintenance department of automation reliability reports that outlined the principal causes of unsuccessful hole completion led to an increase in production metres of a further 4.1 per cent, measured between January 2007 and August 2007. First hole automation reliability increased from 39 per cent to over 77 per cent over the same time period. Second hole automation completion was increased to 74 per cent, leading to a higher proportion of production achieved through automated technologies.

关键词： Automation

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Expanding the Scene of Tunnel Behaviour Through the DEM Model: a Case Study from ZaB-Zentrum Am Berg

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BHM Berg- und Huttenmannische Monatshefte 2023年第12期168卷 586-595页

作者： Promneewat, Khomchan Leelasukseree, Cheowchan Villeneuve, Marlene Galler, Robert NATM Engineering program Institute of Rock Mechanics and Tunnelling Graz University of Technology Rechbauerstraße 12 Graz8010 Austria Department of Mining and Petroleum Engineering Faculty of Engineering Chiang Mai University Chiang Mai50200 Thailand Subsurface Engineering Montanuniversität Leoben Franz-Josef Straße 18 Leoben8700 Austria

The displacement of a tunnel plays a crucial role in conventional tunneling methods, serving as a key parameter for support requirement. Therefore, analyzing tunnel displacement is important for ensuring safety and optimizing costs by determining the appropriate level of tunnel support and installation time. Numerical analysis methods are commonly employed for assessing tunnel displacement, and two widely recognized approaches used worldwide are the continuum and discontinuum methods. While previous studies have highlighted differences in the analysis results obtained from these two methods, the magnitude of such disparities has not been extensively explored. Hence, the objective of this study is to quantify the extent of variation between the two methods through various scenarios, encompassing unsupported and supported excavated ground. Specifically, the focus is on tunnel displacement and the tensile force generated on axial tunnel supports, such as rock bolts. To facilitate this investigation, three tunnel sections from the Zentrum am Berg, tunnel research centre located in Austria, are utilized. The results show that discontinuum models exhibit higher displacements and higher tensile loads on axial support than continuum numerical models of the same tunnel geometry and equivalent rock masses. We show that discontinuum models can also capture asymmetric behaviour, and thus should be preferentially used in fractured rock masses where displacement of rock blocks dominate the rock mass behaviour. © 2023, The Author(s).

关键词： Finite element method

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TECTONIC GEOMORPHOLOGY ANALYSIS OF THE EAST LEMBANG FAULT SYSTEM IN THE UJUNG BERUNG AND JATINANGOR AREA, WEST JAVA, INDONESIA 44

TECTONIC GEOMORPHOLOGY ANALYSIS OF THE EAST LEMBANG FAULT SY...

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44th Asian Conference on Remote Sensing, ACRS 2023

作者： Sulastri, Murni Sadisun, Imam A. Sulaksana, Nana Sukrisyanti Rendra, Pradnya Paramarta Raditya Wahyuni, Sri Geological Technology Study Program Mining Energy Polytechnic Bandung Bandung Indonesia Indonesia Indonesia Faculty of Geological Engineering Universitas Padjadjaran Bandung Indonesia Bandung Indonesia

ISBN: (纸本)9781713893646

Lembang fault is an active fault that may trigger earthquakes and landslides in the North Bandung area. The movement of the fault is on the mainland, theLembang fult is still being debated even though an earthquake has been recorded which may have originated from this fault. The epicenter in the Cihideung area, in addition to tectonic influences, the activity of the Lembang fault is also thought to be influenced by volcanism which can affect the mechanism of fault movement. Tectonic processes play an essential role in the formation of the morphology of an area. The Lembang fault is a normal fault that was formed as a result of tectonic activity in the Neogene sge, located in the northern part of Bandung, stretching for 30 km in a west-east direction, the existence of this fault has shaped the morphology of the Lembang plains to the north and forms a hilly path trending west-east to the north. South. Tectonic geomorphology is the main factor that controls the development of landforms in active tectonic areas and have a significant influence on the natural features of mountains and watersheds which are located east of the Lembang fault, Cikapundung, and Cikeruh. Trending northwest-southeast geomorphic indication analysis is used to study tectonic activity in the study area in the form of basin shape (Bs), watersheds gradient index (SL), drainage basin asymmetry (Af), mountain face sinuosity (SMF) and valley floor width to valley height ratio (Vf). These geomorphic indication variables are combined to produce degrees of relative tectonic activity in the research area which can be divided into four classes;class 1 has a very high relative tectonic activity index, class 2 has a relatively high tectonic activity index, class 3 has a relatively moderate tectonic activity index, and class 4 has a relatively low tectonic activity index, field observation data in the form of the landform and geology of the research area support these results. © 2023 ACRS. All Rights Reserved.

关键词： Geomorphic Indication Lembang Fault Tectonic Geomorphology

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Application of Artificial Intelligence in Forecasting Geothermal Production 9

Application of Artificial Intelligence in Forecasting Geothe...

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9th ITB International Geothermal Workshop 2020, IIGW 2020

作者： Wardoyo, Galih Kusumo Pratama, Heru Berian Sutopo Ashat, Ali Yudhistira, Yodha Geothermal Engineering Master's Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha 10 Bandung40132 Indonesia Jl. Trunojoyo No.135 Jakarta Indonesia

A reservoir is the main asset of a geothermal business. Decreasing reservoir performance affects the sustainability of production in the future. In planning future production strategies, forecasting production projections are used with the assumption of particular parameter values. A reservoir is a porous media with a heterogeneous nature with a high degree of uncertainty, so using a specific production forecasting method's assumption parameter becomes inaccurate. This study aims to develop alternative methods for optimizing and estimating geothermal production by eliminating assumptions. Artificial intelligence (AI) is an alternative method that can be used to predict reservoir productions that has properties with a high degree of uncertainty and can be used to optimize production. The AI model was created using measurement data of production parameters at the steam dominated geothermal field in Patuha, Indonesia. AI models in estimating geothermal reservoir production are more accurate in calculating production projections because they use real field data and eliminate assumptions. © Published under licence by IOP Publishing Ltd.

关键词： Forecasting

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Welcome to San Francisco, California, USA

45th US Rock Mechanics / Geomechanics Symposium

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45th US Rock Mechanics / Geomechanics Symposium 2011年

作者： Iannacchione, Anthony Mining Engineering Program Swanson School of Engineering University of Pittsburgh United States

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