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9th ITB International Geothermal Workshop 2020, IIGW 2020

作者： Assiddiqy, Muhamad Hasbi Gati, Rai Sibarani, Betseba Suryantini Geothermal Engineering Master's Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha No.10 Bandung40132 Indonesia

The application of volcanostratigraphy has been broadly used on many early stages of geothermal exploration. The method is simple yet powerful to give a preliminary suspicion on geothermal potential before a field survey. By combining contour analysis in certain scale (1:50,000 and 1:100,000) such as ridge and river pattern with the stratigraphic analysis of volcanic product the volcanostratigraphy units are determined. In this study, the volcanostratigraphy units were assessed using geothermal potential evaluation scheme for a stratovolcano to determine the potential of a geothermal green *** the object of the study, a quarternary stratovolcano of Slamet Volcanic Complex in Central Java region was analyzed. Eight volcanostratigraphic units were determined in Slamet Volcanic Complex area and its surrounding, including six crowns and two hummocks. In addition, the hydrothermal fluid from several manifestations within the Slamet Volcanic Complex area (warm springs) were analysed to characterize the potentials of Slamet Volcanic Complex Region. Based on these determined volcanostratigraphy units,the occurrence of hydrothermal manifestation within the defined volcanostratigraphy units, the result of hydrothermal fluid analysis, and the criteria matching to the potential evaluation scheme for stratovolcano, the Slamet Volcanic Complex was categorized as potentially beneficial to be surveyed in detail. In such system, the volcanostratigraphy method is relatively simple and reliable to be applied since the volcanic evolution sequences data are accessible. © Published under licence by IOP Publishing Ltd.

关键词： Volcanoes

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New Models for Predicting Co2 Diffusion Coefficient in Brine at High Pressure (100 Mpa) and Temperature (T = 673°K) by Artificial Intelligence ─ Implications for Co2 Sequestration in Deep Saline Aquifers

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SSRN 2024年

作者： Kouhi, Maryam Mahmoudi Kohzadvand, Kamyab Shahin, Matin Shafiei, Ali Petroleum Engineering Program School of Mining and Geosciences Nazarbayev University 53 Kabanbay Batyr Avenue Astana010000 Kazakhstan Tehran Iran Faculty of Petroleum and Natural Gas Engineering Sahand University of Technology Tabriz Iran

Saline aquifers are considered as a prime target for permanent geological storage of anthropogenic CO2 owing their relative abundance and suitable storage capacity, worldwide. A deep understanding of CO2 diffusion in brine is central in modeling CO2 sequestration operations. CO2 diffusion coefficient can be determined precisely in laboratory but such tests are constrained by their relatively high cost, time intensive nature, and safety concerns due to need for high-pressure equipment. Development of precise, fast, and robust models and correlations for a broad range of pressure and temperature is vital. The goal of this research work was to develop connectionist predictive models and a correlation using four neural network algorithms to predict CO2 diffusion coefficient in CO2-brine system for pressures of up to 100 MPa and temperatures of up to 673°K. The algorithms used include multilayer perceptron (MLP), cascade forward neural network (CFNN), recurrent neural network (RNN), and gene expression programming (GEP). The databases consist of 191 experimental and molecular dynamics (MD) simulation data collected from the open literature. The input parameters include pressure, temperature, and density of brine. Density of brine was never been considered in previous modeling works where it has the greatest effect on diffusion coefficient of CO2 in brine. The Bayesian regularization algorithm was used to optimize the developed smart models. The MLP yielded the most accurate predictions with a root mean squared error (RMSE) and coefficient of determination (R2) of 2.945 and 0.998, respectively. The proposed MLP model is superior to the existing smart models and correlations considering both precision and range of pressure and temperature. Having an accurate estimation of CO2 diffusion in brine can be quite useful during preliminary assessment and modeling of CO2 sequestration operations in deep saline aquifers. © 2024, The Authors. All rights reserved.

关键词： Carbon dioxide

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Volcanostratigraphic Approach and its Implication for Geothermal Evaluation in Talang Volcano West Sumatra 9

Volcanostratigraphic Approach and its Implication for Geothe...

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9th ITB International Geothermal Workshop 2020, IIGW 2020

作者： Kobare, Nyora Donald Akrom, Fadhil Muhammad Hermawan, Irfan Berrizki Geothermal Engineering Master's Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha No.10 Bandung40132 Indonesia

The desk studies are a fundamental preliminary step in any geologic investigation of volcanic regions. These studies are very important approaches used in the reconnaissance survey stage for the exploration of volcanic geothermal systems. Volcanostratigraphic study has been done in Talang volcano and nearby regions, where the two topographic maps on the scale of 1:100000 and 1:50000 were utilized by drawing the patterns of drainage, ridges and flows without intersecting these flows. The first scale employed to distinguish eruption product units based on their respective eruptive centers (Crown), as well as a map on 1:50000 scale to find detailed parasitic distributed unit (s) product such as (Hummock). The challenge based on this approach is to distinguish different volcanic products based on their origins without ground truthing. Thus, the correlation with existing published geological map was employed. One volcanic unit were identified (Talang Brigade) which consists of three eruption centers (The Talang Bawah, Talang Batino and Talang Jantan Crowns) and three Hummocks with different ages based on age of eruption. The volcanostatigraphic units, is bounded by a large Talang Brigade caldera with a diameter more than 2 km. Based on analyses of the dimension, maturity, stress regimes, and an estimation of the thermal resource base of its magmatic heat source, it was concluded that Talang volcano as a geothermal potential that deserves further detailed studies before embarking to development phase. For verifying desk work studies, the detailed volcanostratigraphic mapping is recommended to understand the physical- and chemical properties of the volcanic rocks and provide the history of volcanism and validation of the potentially geothermal boundaries. © Published under licence by IOP Publishing Ltd.

关键词： Volcanoes

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Influence of Brine Compositions on Wetting Preference of Montmorillonite in Rock/Brine/Oil System: An in Silico Study

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SSRN 2022年

作者： Ghasemi, Mehdi Shafiei, Ali Petroleum Engineering Program School of Mining & Geosciences Nazarbayev University Nur-Sultan010000 Kazakhstan

In this paper, we investigated dependency of thin brine film stability confined between rock and hydrocarbon layer on brine solution properties in terms of salinity and anionic components. Molecular Dynamics simulation was used to investigate behavior of the system at rock/brine and brine/oil interfaces to characterize thin brine film. Here, montmorillonite, a thin water film containing different salinities (low salinity water, 5,000 ppm, and high salinity water, 70,000 ppm) of NaCl and Na2SO4, and organic components constituting 3:1 molar mixture of decane and sodium decanoate were considered to represent rock, brine, and oil, respectively. High salinity brine makes the thin film more stable. Extensive repulsive electrostatic forces between Cl⁻ anions distributed in brine film and carboxylate functional groups at the brine/oil interface impede penetration of oil components into the brine film and then their adsorption onto the clay surface. Low salinity Na2SO4 showed the most stable brine film, in which distribution of anions at the brine/oil interface prevents intrusion of oil components into the brine film. However, high salinity Na2SO4 showed strong potential in forming ionic aggregations comprising Na+ cations and anions. These ionic aggregations act as bridging agents to adhere oil constituents onto the clay slab. © 2022, The Authors. All rights reserved.

关键词： Molecular dynamics

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Barium-Doped Niobium Pentoxide Enhances the Performance of Zinc-Ion Battery

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SSRN 2024年

作者： Erhardt, Camila Stockey Lubini, Marcieli Rodrigues, Yásmin Alves, Annelise Kopp Graduate Program in Mining Metallurgical and Materials Engineering Universidade Federal do Rio Grande do Sul Av. Osvaldo Aranha 99 Porto Alegre90035-190 Brazil

The capacity of zinc-ion batteries can be significantly enhanced by using other materials in the electrodes to expand their conduction potential. In this study, Nb2O5 was employed in one of the electrodes to enhance its performance. To optimize the characteristics, Nb2O5 was doped with barium (Ba). Niobium pentoxide was synthesized through microwave-assisted hydrothermal synthesis and doped with 1%, 3%, and 5% Ba. Samples of Nb2O5 and its doped variants were characterized using X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), N2 adsorption isotherms for specific surface area analysis (BET), diffuse reflectance spectroscopy for bandgap determination, and X-ray photoelectron spectroscopy (XPS). The analyses revealed a nanostructured orthorhombic crystalline structure, and a significant increase in surface area and bandgap was correlated with Ba concentration. Batteries with doped Nb2O5 exhibited better stability and storage capacity in electrochemical assays than undoped ones. Specifically, doping with 3% Ba provided the best stability and electrochemical storage performance. This study elucidated the beneficial effects of barium doping on niobium pentoxide, showcasing the promising potential for its application in zinc-ion batteries. © 2024, The Authors. All rights reserved.

关键词： Energy gap

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Modelling Background Seismicity Source for Probabilistic Seismic Hazard Analysis in Manado City, North Sulawesi 9

Modelling Background Seismicity Source for Probabilistic Sei...

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9th Asian Physics Symposium 2021, APS 2021

作者： Zulkifli, M. Triyoso, Wahyu Earth Sciences Graduate Program Faculty of Earth Sciences and Technology Bandung Institute of Technology Bandung Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Bandung Indonesia Manado Indonesia

This study is used a background source model to calculate probabilistic seismic hazard analysis (PSHA) in Manado City. The gridded seismicity model is applied to characterize the background source model based on the seismicity rate on each grid 0.1 × 0.1 degrees. The results obtained from this study was the contribution of background sources for PSHA in Manado City for the probability of excedence 10% in 50 years is 0.18 ≥ g ≤ 0.19. © Published under licence by IOP Publishing Ltd.

关键词： Hazards

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Focal Mechanism Inversion on the Aftershock Sequence of the 25 October, 2010 Mw 7.8 Mentawai Earthquake: A Preliminary Result 9

Focal Mechanism Inversion on the Aftershock Sequence of the ...

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9th Asian Physics Symposium 2021, APS 2021

作者： Daniarsyad, Gatut Afnimar Master Program of Earth Sciences Faculty of Earth Sciences and Technology Bandung Institute of Technology Bandung Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Bandung Indonesia Jakarta Indonesia

An Mw 7.8 tsunami earthquake ruptured the shallow part of the Mentawai megathrust on 25 October 2010 and generated a large tsunami that hit the Mentawai Islands. The earthquake continued a partial rupture sequence of the 2007 Mw 8.5 and 7.9 Bengkulu earthquake and the 2008 Mw 7.2 North Pagai earthquake. The aftershock activity gives the opportunity to investigate the geometry of the subduction interface, which is critical to understanding the propagation and termination of a large earthquake. However, it is necessary to have a precise location and mechanism of the aftershock distribution to clearly image the fault geometry. In this preliminary study, we have applied the Cut-and-Paste (CAP) focal mechanism inversion method to 20 aftershocks (M ≥ 4.9) of the 2010 Mentawai earthquake. The seismic waveforms recorded by the BMKG broadband seismic network on the regional distance were used in the inversion. They successfully obtained ten focal mechanisms more than that provided in the GCMT catalog. The result exhibits a distinctly different thrust and normal faulting aftershocks activity. The thrust faulting aftershocks are mainly distributed in the downdip of the Mentawai 2010 mainshock rupture, indicating the stresses that have not been released during the mainshock. In the shallow region near the trench, the aftershocks are dominated by a normal faulting mechanism which shows the tensile stress caused by the bending of the subducting plate. © Published under licence by IOP Publishing Ltd.

关键词： Tsunamis

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Resonance Behavior of a Conducting Wire Object above a Halfspace

Resonance Behavior of a Conducting Wire Object above a Halfs...

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2022 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, AP-S/URSI 2022

作者： Li, Siyuan Hargrave, Chad Lui, Hoi-Shun University of Technology Sydney Global Big Data Technologies Centre School of Electrical and Data Engineering UltimoNSW2007 Australia Commonwealth Scientific and Industrial Research Organisation Sustainable Mining Research Program PullenvaleQLD4069 Australia

ISBN: (数字)9781665496582

ISBN: (纸本)9781665496582

Successful extraction of the resonant modes embedded in the transient target signature is vital to resonance-based radar target recognition. For targets in free space, although these resonant modes are theoretically aspect independent, the corresponding residues are known to be aspect dependent. When the target is located above a halfspace, the interface will electromagnetically interact with the target and alter the residue. Within the context of resonance-based target recognition, the influence from an interface to the residues, to the best of our knowledge, has not been well studied. In this paper, we study this problem through a wire target. Our results show that the residues of the mode follow a similar behavior as the dielectric properties of the halfspace vary. © 2022 IEEE.

关键词： Resonance

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Resonance Behavior of a Conducting Wire Object below a Halfspace

Resonance Behavior of a Conducting Wire Object below a Halfs...

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2022 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, AP-S/URSI 2022

作者： Li, Siyuan Hargrave, Chad Lui, Hoi-Shun University of Technology Sydney Ultimo Global Big Data Technologies Centre School of Electrical and Data Engineering NSW2007 Australia Commonwealth Scientific and Industrial Research Organisation Sustainable Mining Research Program PullenvaleQLD4069 Australia

ISBN: (数字)9781665496582

ISBN: (纸本)9781665496582

The resonance scattering phenomena of an object buried below a dielectric halfspace has been studied with potential applications such as unexploded ordnance detection and breast tumor screening. These studies adopted a theoretical approach where the resonant frequencies are numerically determined via a complex root searching procedure from the impedance matrix obtained from an integral equation formulation. The practically of retrieving these resonant modes from transient responses under different excitation aspects, though is crucial for subsurface target detection application, has not been well studied. In this paper, the resonant frequencies and the corresponding residues are extracted from the transient responses of a metallic wire object below halfspace. We found that the same set of resonant modes is extracted in most cases, but the residues vary significantly as the incident angle. © 2022 IEEE.

关键词： Transient analysis

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Analysis of Hydrogeology and Rainwater Prevention Systems at Sepo Village in Central Halmahera Regency, North Maluku 3

Analysis of Hydrogeology and Rainwater Prevention Systems at...

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3rd International Conference on Science and Technology 2019, ICST 2019

作者： Lukman, Nurany Karim, Razak Mining Engineering Study Program Faculty of Engineering Khairun University Ternate North Maluku Indonesia Mining Engineering Study Program Faculty of Engineering Muhammadiyah University Ternate North Maluku Indonesia

mining water is one of the main problems that has a great importance on mine productivity. In mining implementation, it is necessary to study the mining Water (Hydrogeology) system to support a good mine design. The mining Water drainage system is a method for making work sites in the mining area always dry. Prior to mining, hydrogeological analysis and rainwater management methods are carried out. Calculation of rainfall intensity using Gumbel Probability estimation and water capture area analysis obtained CA-1 Q = 915, 35, m3 / day CA-2 Q = 1149, CA-3 Q = 141116, 01CA-4 Q = 1407.89, the form of rainwater trapping channels in the form of trapezium and pump requirements in each catchment area of 1 (one) pump each. © 2020 Published under licence by IOP Publishing Ltd.

关键词： Hydrogeology

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