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2nd Southeast Asian Conference on Geophysics, SEACG 2018

作者： Haerusalam, Herdis Sahara, David P. Fatkhan Study Program of Geophysical Engineering Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Ganesha 10 Bandung40132 Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Insitut Teknologi Bandung Ganesha 19 Bandung40132 Indonesia Exploration and Engineering Seismology Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Ganesha 10 Bandung40132 Indonesia

CO2 injection into the hydrocarbon reservoir affects the subsurface mechanics and hydraulic condition. The injection has to be performed in a way that there will be no reservoir and/or top seal failure. In such case, a simulation of the injected fluid propagation needs to be performed to see its possible impact to the top seal and existing major faults. We use finite element method to perform this injection simulation. In this research, we use open source software Finite Element Heat and Mass Transfer Code (FEHM) to simulate CO2 injection processes into reservoir. Subsurface geological model was constructed in a dimension of 3000 m (easting) x 3000 m (northing) x 2000 m (vertical). Vertically, it consists of four layers which represent upper layer (400 m), top seal (200 m), reservoir (900 m), and basement (500m). The grid around the reservoir rocks is refined to give more detail results. The open hole injection is set at 850 - 890 m depth, 1500 m easting and 1500 m northing. The material is assumed to be isotropic. The initial pressure and temperature increase as a function of depth with a pressure gradient of 0.00981 MPa/m and a temperature gradient of 0.025 degrees C/m. A vertical fault is modelled at 600 m eastern to the injection well. Injection process is carried out with 6 kg/s of CO2 injection with simulation time for ten years to see its impact to the fault. A vertical fault is The modelling results show that the CO2 injection will not reactivate the fault at 10 years. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Carbon dioxide

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Magnetic mineral concentration and microcrystalline characteristics of Fe-rich coastal sand from North Sulawesi

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AIP Conference Proceedings 2023年第1期2694卷

作者： Gerald Tamuntuan Ping A. Angmalisang Adey Tanauma Seni H. Tongkukut Hanny F. Sangian Agnes T. Mandagi Silvia J. Fajar Dolfie P. Pandara Guntur Pasau Ferdy Ferdy As’ari As’ari Department of Physics Sam Ratulangi University Manado 95115 Indonesia Marine Science Study Program Sam Ratulangi University Manado 95115 Indonesia Department of Civil Engineering Sam Ratulangi University Manado 95115 Indonesia Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Bandung 40132 Indonesia

Magnetic mineral concentration, especially from the iron oxide class, is one of the important indicators in determining the potential iron sand natural resources. In this study, the magnetic measurement as well as X-ray spectroscopy analysis have been carried out in order to determine the concentration and microcrystalline characteristics of iron sand originating from four locations in the coastal area of North Sulawesi which are Lolan, Lalow, Hais, and Minanga. Magnetic properties study through measurement of saturation isothermal remanent magnetization (SIRM) confirmed by oxide composition obtained from X-ray fluorescence (XRF) observation showed that the iron sand sample from Lolan had the highest concentration of iron oxide minerals followed by samples from Hais, Lalow, and Minanga respectively. The percentage of iron oxide at these sites varied between 60.33 – 76.70 wt.%, implying that it was relatively competitive compared to the samples from other localities in Indonesia. Findings related to variations in crystal size and degree of crystallinity are closely related to the source and mechanism of iron sand formation at each study site.

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

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Journal of Physics: Conference Series 2020年第4期1569卷

作者： Nurany Lukman Razak Karim 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.

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Integrated Pore Pressure Model Estimation – Case study of Jambi Sub-basin, South Sumatera, Indonesia

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IOP Conference Series: Earth and Environmental Science 2021年第1期873卷

作者： Ahmad Farhan Farabi Ignatius Sonny Winardhie Noor Cahyo Wibowo Geophysical Engineering Study Program Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Bandung Indonesia Geophysics Division Pertamina Upstream Technical Center Jakarta Indonesia.

Pore pressure estimation is crucial in drilling wells for safety purposes also a very effective method for dealing with drilling accidents. Determination of overpressure is the main foundation in the evaluation to minimize the non-productive time (NPT). Here we present several models to generate pore pressure analysis of well from Jambi Sub-basin, South Sumatera, Indonesia. The model for estimation pore pressure is carried out by 3 methods: Eaton, Yan & Han, and Kan & Swan. Those methods will be compared to gain a more accurate model estimation within the study area. Kan and Swan's model show the best fit for estimation because this method is suitable for the formation of tester like MDT/DST on higher frequency with parameter of C1 = 0.001 and C2 = 0.0003 for Jambi Sub-basin. The velocity data to construct the 3D pore pressure model was also validated with well data using multi-attribute analysis. The multi-attribute analysis used 2 algorithms, namely step-wise regression and probabilistic neural network (PNN). The analysis show that PNN has a better correlation compared to step-wise regression. The analysis shows the overpressure zone depth is ranges from 1700 – 2000m on Gumai Formation with maximum pressure around 6500 psi. The peak of overpressure dominated by Gumai and Talang Akar formation is caused by the loading mechanism because the rate of sedimentation on thick shale sequence is higher than the rate of dewatering on those formations.

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Evaluation of heavy metal (Cu, Pb, Zn) distribution in base metal mining area at Sangkaropi: implication for land use planning

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IOP Conference Series: Earth and Environmental Science 2021年第1期921卷

作者： U R Irfan A Maulana I Nur M Thamrin M Manaf Geological Engineering Department Universitas Hasanuddin Gowa Indonesia Mining Engineering Department Universitas Hasanuddin Gowa Indonesia Urban and Regional Planning Study Program Bosowa University Makassar Indonesia

Settling-pond treatment systems have been applied in the base-metal mining area at Sangkaropi, South Sulawesi, Indonesia, before being discharged into the Koyan River through the agriculture area. This study aims to conduct a valuation of pollutant Pb, Cu and Zn in areas impacted by base-metal mining in sediment materials as a sensitive indicator for monitoring contaminants in the aquatic environment. Sediment sampling location, the first is in the upstream before the mining location, the second is located in the mining area to settling pond, and the third is in the area after settling-pond to the agriculture area. The concentrations of heavy metal were analyzed using uses AAS method. The assessment is performed based on the value of contamination degree, enrichment of heavy metal pollutant and ecological risk. The arrangement of the average frequency of heavy metal concentrations is Pb>Cu>Zn, which Cf and I-geo values have the almost same behavior. All metal in the upstream and agriculture site is classified as a low category, the Cu on the second and third sites is moderate. The assessment results from this study represent that Pb has a considerable ecological risk category value. However, polluted-Cu are categorized moderately need to be cautious, because metal enrichment comes from mineralization bedrock in the river. Therefore, the result of this study shows that geologic data, especially mineralized bedrocks associated the heavy metal concentration, should be taken into consideration in land-use planning policy in areas that have been impacted by mining and in the assessment of environmental health impacts.

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Total sulfur variability analysis of coal deposits using ordinary kriging estimation

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AIP Conference Proceedings 2021年第1期2363卷

作者： Yuniar Siska Novianti Romla Noor Hakim Nurhakim Hafidz Noor Fikri Study Program Mining Engineering Faculty of Engineering Universitas Lambung Mangkurat Jl. Jenderal Achmad Yani KM 355 Banjarbaru Kalimantan Selatan - 70714 Indonesia

Coal's price collapse has become a challenge in exploring and exploiting coal deposits in the mining industry. Total sulfur is one of the coal qualities sufficiently considered in the use of coal. The Geostatistics method using ordinary kriging estimation is done to determine the total sulfur variation in the coal seam. Modelling was performed on every three meters of coal thickness using 193 samples on a seam of coal with a thickness of up to 30 meters. Geostatistical modelling is implemented on the coal seam, and it produces ten sulfur distribution models. The modelling results show clearly that in the model in the first layer, the distribution of sulfur is higher in value than other layers. These results expected can help select mining stages and exploration drilling activities in the context of increasing coal reserves.

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Exploring the feasibility of nanocomposites from solid waste materials for acid mine drainage remediation: A comprehensive scientific review

Total Environment Engineering

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Total Environment engineering 2025年 2卷

作者： Yudha Gusti Wibowo Hana Safitri Dedy Anwar Arif Rohman Anis Tatik Maryani Sudibyo Sudibyo Setyo Budi Kurniawan Ahmad Tawfiequrahman Yuliansyah Himawan Tri Bayu Murti Petrus Department of Mining Engineering Institut Teknologi Sumatera Jalan Terusan Ryacudu Way Hui Kecamatan Jati Agung Lampung Selatan 35365 Indonesia Center for Green and Sustainable Materials Institut Teknologi Sumatera Jalan Terusan Ryacudu Way Hui Kecamatan Jati Agung Lampung Selatan 35365 Indonesia Department of Chemical Engineering Universitas Gadjah Mada Daerah Istimewa Yogyakarta 55284 Indonesia Department of Geomatic Engineering Institut Teknologi Sumatera Jalan Terusan Ryacudu Way Hui Kecamatan Jati Agung Lampung Selatan 35365 Indonesia Agroecotechnology Study Program Faculty of Agriculture Universitas Jambi Jambi Indonesia Research Center for Mining Technology Badan Riset Inovasi Nasional Tanjung Bintang Lampung Indonesia Department of Chemical and Process Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia 43600 UKM Bangi Selangor Malaysias

Acid Mine Drainage (AMD) poses significant environmental challenges to water resource management. This review explores the potential of waste materials in developing nanocomposites for AMD treatment. The study highlights the benefits of using agricultural residues, industrial byproducts, and municipal solid waste as components in nanocomposites. These waste-based nanocomposites offer cost-effectiveness, resource conservation, and transformation of waste into valuable assets. The mechanisms of pollutant removal, recent trends, and advancements in nanocomposites for AMD treatment are discussed. Unlike previous studies, this work provides a pioneering comprehensive assessment of waste-derived nanocomposites, systematically synthesizing state-of-the-art advancements while critically evaluating their practical application and ecological impact. Recommendations for optimizing nanocomposites include material selection, property tailoring, and field implementation. Future research directions are proposed, such as advanced characterization techniques, novel waste material exploration, and ecological impact evaluation. Harnessing waste material potential can promote sustainable water and waste management, restoring AMD-affected environments and protecting water resources.

关键词： Acid mine drainage Adsorption Nanocomposites Water pollution Wastewater treatment

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Probabilistic approach of resource assessment in Kerinci geothermal field using numerical simulation coupling with monte carlo simulation 6

Probabilistic approach of resource assessment in Kerinci geo...

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6th ITB International Geothermal Workshop, IIGW 2017

作者： Hidayat, Iki Sutopo Pratama, Heru Berian Study Program of Petroleum Engineering Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Indonesia Study Program of Geothermal Engineering Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Jl. Ganeca No. 10 West java Bandung40132 Indonesia

The Kerinci geothermal field is one phase liquid reservoir system in the Kerinci District, western part of Jambi Province. In this field, there are geothermal prospects that identified by the heat source up flow inside a National Park area. Kerinci field was planned to develop 1×55 MWe by Pertamina Geothermal Energy. To define reservoir characterization, the numerical simulation of Kerinci field is developed by using TOUGH2 software with information from conceptual model. The pressure and temperature profile well data of KRC-B1 are validated with simulation data to reach natural state condition. The result of the validation is suitable matching. Based on natural state simulation, the resource assessment of Kerinci geothermal field is estimated by using Monte Carlo simulation with the result P10-P50-P90 are 49.4 MW, 64.3 MW and 82.4 MW respectively. This paper is the first study of resource assessment that has been estimated successfully in Kerinci Geothermal Field using numerical simulation coupling with Monte carlo simulation. © Published under licence by IOP Publishing Ltd.

关键词： Monte Carlo methods

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An Analysis of Coal Post-mining Land for Agricultivation Uses (A Case study on PT ABK in Kutai Kartanegara District, East Kalimantan Province)

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IOP Conference Series: Earth and Environmental Science 2022年第1期950卷

作者： Ansahar S R P Sitorus H Hardjomidjojo E I K Putri Natural Resources and Environmental Management Science Study Program Graduate School of IPB University West Java Indonesia Department of Engineering Faculty of Mining Enginering Kutai Kartanegara University Kutai Kertanegara District Kalimantan Timur Province Indonesia IPB University West Java Indonesia

The characteristics of coal surface mining activity are vulnerable to environmental degradation due to soil excavation, although only causing a lower risk in worker's incidence and economically beneficial as requiring a lower cost than the underground mining method. This study aimed to analyze the types of post-mining land use worth developing for the local community's livelihood around the post-mining land on the concession of PT Anugerah Bara Kaltim (ABK) in Kutai Kertanegara District, Kalimantan Timur Province. The method used was a cost-benefit analysis (CBA). The analysis results indicate that the pepper plant cultivation on the post-mining land within six years produces Net Present Value (NPV) at Rp 49,484,637.00, Benefit/Cost (B/C) Ratio at 1.347, Net B/C Ratio at 2.56, and Internal Rate Return (IRR) at 39.20%. Meanwhile, rice plant cultivation stimulated within six years produces NPV at Rp 8,653,754.00, B/C Ratio at 1.035, Net B/C ratio at 1.3871, IRR at 8,50%. The economic analysis results based on all indicators: NPV, B/C, net B/C, and IRR, demonstrate that the pepper and rice plant cultivation activities are feasible in the coal post-mining land.

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Pre-feasibility study of Condensing Wellhead Generating Unit Utilization in Partially Vapor Dominated System

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IOP Conference Series: Earth and Environmental Science 2020年第1期417卷

作者： M A Dahlan H B Pratama N M Saptadji Petroleum Engineering Study Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Geothermal Engineering Study Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha No. 10 Bandung West Java Indonesia. 40132

The development of geothermal fields needs 5-6 years from the first well drilled until the operation of the central power plant. Between the gap years, the wells will be shut in and will be re-opened when the power plant is ready. However, there is an alternative to utilize the wells with Wellhead Generating Unit (WGU), the small power plant which can generate the electricity as soon as the drilled productive wells completed. Then, the objective of this study is to decide the preferable scheme for the installed capacity of WGU with economic consideration. Correspondingly, this study uses two full factorial experimental design with Monte Carlo simulation to calculate and design the condensing turbine. Steam fraction, mass flow rate, turbine inlet pressure, and turbine exhaust pressure are the parameters to be analyzed in the Monte Carlo Simulation. The economic feasibility of the project is based on capital expenditure, decline curve analysis, and electricity price. The result of probability, P10, P50, and P90 of gross power output and Specific Steam Consumption (SSC) are 6.1, 7.9, 9.9 MWe and 1.85, 1.89, 1.93 kg/s/MWe respectively. Based on the economic evaluation, the P10, P50, and P90 of Internal Rate of Return (IRR) and Net Present Value (NPV) are 12%, 16%, 21% and 1.1 MUSD, 3.6 MUSD, 6.0 MUSD respectively over 30 years of WGU lifetime. This paper is the first study for designing the WGU combined with an economic study based on the technical evaluation to propose the best option to develop the field.

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