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9th ITB International Geothermal Workshop 2020, IIGW 2020

作者： Suryanto, Sigit Tofan Sastranegara, R.M. Untoro, Antonius Rishang Affif, Nanda Najih H. Effendi, Ristio Raharjo, Imam B. Suryantini Pertamina Geothermal Energy Indonesia Geothermal Engineering Master's Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha 10 Bandung40132 Indonesia

Integrated geoscience data evaluation is needed to determine the location of the heat source in the Tompaso Geothermal Field. The location of the heat source in the Tompaso Geothermal Field should be known to update the conceptual model. The updated conceptual model can be used as a reference in development plans of Tompaso Geothermal Field. Therefore, through integrated geoscience data evaluation such as geological settings, remote sensing data, resistivity and gravity data, fluid chemistry data, and temperature measurements data from wells are expected to determine the presence of the heat sources, especially beneath Umeh Volcanic Complex (UVC) in the Tompaso Geothermal Field. Based on geological and remote sensing data, the location of heat sources of Tompaso Geothermal Field are predicted beneath Sempu Volcanic Complex (SVC) and Umeh Volcanic Complex (UVC). SVC is related to recent volcanic activity while UVC is related to "monogenetic"volcanism. The gravity data beneath SVC showed high gravity anomaly contrasts than its surrounding areas, while high gravity anomaly beneath UVC has lower contrast than SVC. However, chemical fluid analysis from thermal manifestations and temperature from the wells indicated the presence of heat source beneath UVC. © Published under licence by IOP Publishing Ltd.

关键词： Location

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In-situ Environmental TEM Observations of Structural Evolution of Oxygenated Cu(110) in CO

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Microscopy and Microanalysis 2022年第S1期28卷 186-188页

作者： Sun, Xianhu Wang, Jianyu Chen, Xiaobo Ye, Shuonan Liang, Zhilu Yang, Judith C Zhou, Guangwen Department of Mechanical Engineering & Materials Science and Engineering Program State University of New York at Binghamton Binghamton NY USA Department of Chemical and Petroleum Engineering University of Pittsburgh Pittsburgh PA USA

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Analysis of the Groundwater Table of Theis's Formula Through the Analytical and Numerical Methods Combination for Time-Lapse Microgravity Modeling

SSRN

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SSRN 2024年

作者： Lestari, Mutia Dyah Dahrin, Darharta Abdurrahman, Dadi Azhari, Naila Yuni Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jalan Ganesa 10 Bandung40132 Indonesia Geophysical Engineering Study Program Institut Teknologi Sumatera Jalan Terusan Ryacudu Desa Way Hui Lampung Selatan Kecamatan Jatiagung 35365 Indonesia

Massive and continuous well pumping can result in significant groundwater table decline, potentially leading to groundwater depletion and land subsidence over the long term. The timelapse microgravity method, an innovation in gravity measurement techniques, is currently widely used in hydrological applications, including groundwater table monitoring. Groundwater pumping induces changes in subsurface mass distribution, resulting in subsurface mass anomalies that can be detected using gravity method. Many previous studies have employed the slab Bouguer approach to estimate gravity anomalies due to groundwater table changes. This method has significant error for detail anomaly value of groundwater table, which is high decline near production wells. According to Theis formula, the groundwater table decline model as drawdown cone (inverted cone), which gravitational field is calculated. Therefore, calculated gravity anomaly must account for the drawdown cone shape. In this study, gravity anomaly calculations for groundwater drawdown cones are resolved by integrating triple integrals using cylindrical coordinates both analytical and numerical methods. The analytical calculation of integrating triple integrals can only be resolved for two variables (variable z and [[EQUATION]]), and for [[EQUATION]] variable is calculated using numerical methods with the trapezoidal rule. By making the trapezoidal step smaller for closer the well, it is expected this calculation has smaller errors. This study aims to provide more accurate gravity anomaly calculations in accordance with the conceptual model of groundwater table changes. This technique can be used to help groundwater management where monitoring wells is insufficient. © 2024, The Authors. All rights reserved.

关键词： Microgravity

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Evaluating particulate matter mass and count concentrations in a vehicle cabin: Insights from Kuwait City

Journal of Engineering Research (Kuwait)

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Journal of engineering Research (Kuwait) 2025年

作者： Al-Dabbous, Abdullah N. Goel, Anju Alsulaili, Abdalrahman Al-Dabbous, Shoug Kh. Shalash, Musaed Environmental and Climate Change Program Environment & Life Sciences Research Center Kuwait Institute for Scientific Research Kuwait The Energy and Resources Institute New Delhi India Civil Engineering Department College of Engineering and Petroleum Kuwait University Kuwait

Inhaling quality air is crucial for good health. Therefore, investigating air quality in various microenvironments, especially indoors where people spend most of their time, is essential. This study examines particulate matter (PM) concentrations in a vehicle cabin over one week in September, representing late summertime conditions. It focuses on measuring PM mass and count across various size ranges (0.3–0.5, 0.5–1.0, 1.0–2.5, 2.5–5.0, 5.0–10.0, 10.0–25.0 μm) under different ventilation settings in a private vehicle on one of Kuwait's busiest highways. Thirty-five runs were conducted across five ventilation settings over seven days. These settings included combinations of AC fan speeds, recirculation status, window positions (open and closed), and smoking activities. No significant trends were observed between weekends and weekdays due to minimal traffic differences. However, distinct PM mass and count concentration variations were noted across ventilation settings. Setting 5 (AC at medium fan speed, vent and windows closed, smoking allowed) had the highest PM mass and count concentrations in smaller sizes (diameter ≤2.5 μm) due to active smoking. Setting 1 (AC off, vent and windows open, no smoking) recorded the second-highest PM mass (diameter ≥2.5 μm) and count (diameter ≤2.5 μm) concentrations due to outdoor pollution. PM mass and count concentrations were lowest under settings 2–4, with negligible differences between them, attributed to the relative restriction of air intake. The highest exposure levels were observed in setting 1, where windows were open, and the lowest in settings with closed windows and AC in recirculation mode. Exposure levels at hotspots were up to 200 % higher. Proximity to construction activities further increased exposure. © 2025 The Authors

关键词： Kuwait Particulate matter Smoking Vehicle cabin Ventilation settings

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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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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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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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Phase Equilibria and Kinetics of Methane Hydrate Formation and Dissociation in Krishna–Godavari Basin Marine Sediments 5th

Phase Equilibria and Kinetics of Methane Hydrate Formation a...

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5th International Conference in Ocean engineering, ICOE 2019

作者： Bhawangirkar, Dnyaneshwar R. Nair, Vishnu Chandrasekharan Sangwai, Jitendra S. Petroleum Engineering Program Gas Hydrate and Flow Assurance Laboratory Department of Ocean Engineering Indian Institute of Technology Madras Chennai600036 India Department of Chemical Engineering Indian Institute of Technology Bombay Powai Mumbai400076 India

ISBN: (纸本)9789811585050

Understanding the formation and dissociation behavior of methane gas hydrate in marine sediments is one of the important precursors for methane gas production from the hydrate deposits. The phase behavior of gas hydrates is influenced by the presence of sediments, composition of salts and water present in it. Krishna–Godavari (KG) Basin in India is one such reservoir which has a huge potential of methane gas hydrates. Here, we have investigated the phase equilibria, and the kinetics of methane hydrate formation, and dissociation in the presence of pure water, and in aqueous solution of 10 wt% (KG) basin sediment. We observed that the phase equilibrium conditions of methane hydrate in presence of 10 wt% sediment solution got shifted to slightly higher pressures at given temperature as compared to that in the bulk phase. It has also been observed that more number of methane gas molecules are consumed in 10 wt% sediment solution in the initial 30 minutes of time than in the pure water system, revealing the promotion effect of sediment surface. The number of moles of methane gas released during the dissociation of hydrate has found to be lesser in sediment solution than in pure water at any given time after initial 55 min of the start of dissociation. © 2021, Springer Nature Singapore Pte Ltd.

关键词： Kinetics

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Effect evaluation of fluid movement and rock properties for artificial seismic activity on hydrocarbons

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Heliyon 2024年第20期10卷 e39572页

作者： Kanjirakat, Anoop Abughaush, Laith Carvero, Arnel Rabbani, Harris Amani, Mahmood Retnanto, Albertus Department of Aeronautical and Automobile Engineering Manipal Institute of Technology (MIT) Manipal Academy of Higher Education (MAHE) Manipal 576104 India Petroleum Engineering Program Texas A&M University at Qatar Education City Doha Qatar

Despite the effectiveness of seismic stimulation in enhancing oil production from reservoirs, the impact of high-frequency vibrations on oil droplets confined within pore throats has not been adequately investigated. This laboratory-scale experimental study examines the impact of low and high-frequency sinusoidal vibrations in dislodging oil droplets trapped in a specific pore-throat region. Sinusoidal vibrations ranging from 10 to 80 Hz and with maximum displacement amplitudes of 1.2–0.06 mm are applied. By comparing the images captured prior to and after the application of seismic vibrations, the amount of oil recovered is determined. Commercial gasoline and diesel are used as trapped oil samples, and water is used as the injection fluid to bring out the effect of fluid viscosities in seismic dislodgment. While applying vibrations to trapped oil in the pore throat, three different recovery modes are observed: continuous, snap-off, and emulsified. The continuous oil recovery mode is observed in cases with minimal flow resistance through the pore throat, whereas a snap-off or intermittent recovery mode is observed when the flow resistance is high, and the vibration frequencies fall within the midrange of 40–60 Hz. An emulsified oil recovery mode is observed at high vibration frequencies. The amount of recovered oil increases as geometrical restrictions and trapped oil viscosity decrease. Seismic mobilization is observed to be directly proportional to the mobilization velocity and inversely proportional to the entrapped oil viscosity and geometrical restriction factors. © 2024 The Authors

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