scholarly journals Analisa Geokimia Fluida Manifestasi Permukaan di Daerah Panas Bumi Lahendong

2020 ◽  
Vol 5 (1) ◽  
pp. 45
Author(s):  
Jeferson Polii ◽  
Alfrie Musa Rampengan
Keyword(s):  
Sulfuric Acid ◽  
Geothermal Energy ◽  
Hot Springs ◽  
Volcanic Rocks ◽  
North Sulawesi ◽  
Hot Air ◽  
Geothermal Potential ◽  
Acid Type ◽  
The Village ◽  
Plate Subduction

Geothermal energy depends on volcanic regions or plate subduction. Indonesia has geothermal potential due to the meeting of 3 (three) large plates. North Sulawesi is one of the areas located in the ring of fire. Some areas in the Minahasa Regency, North Sulawesi province, were targeted for research because they have manifestations of geothermal such as hot pools, steaming ground, mud pools, and other manifestations. The research location is divided into 3 (three) locations around the Lahendong geothermal area, namely the Lahendong pine forest, the Toraget hot air area, and the hot springs in the village of Totolan. The results of sample and ploting tests in ternary diagrams show that all three geothermal manifestations have sulfuric acid type fluids. This type of geothermal fluid has a high SO4 content, while HCO3 and Cl values ​​are low. Hot springs that have a type of sulfuric acid occur in active volcanic regions. This is supported by the lithology of three areas of manifestation which are composed of basalt resulting from volcanic rocks.

scholarly journals Policy Directions of Geothermal Potential at Sembalun District of East Lombok Regency in Nusa Tenggara Barat Province, Indonesia

2018 ◽  
Vol 2 (1) ◽  
pp. 71
Author(s):  
Antoni Wira Prana
Keyword(s):  
Geothermal Energy ◽  
Power Plants ◽  
Volcanic Rocks ◽  
Ground Surface ◽  
Secondary Data ◽  
Power Sources ◽  
Qualitative Research Design ◽  
Tourism Sector ◽  
Geothermal Potential ◽  
Modelling Analysis

This research attempted to study physical characteristics of geothermal and formulate policy directions of geothermal potential through the process of ISM (Interpretative Structural Modelling) analysis in Sembalun District of East Lombok Regency. This descriptive qualitative research design used observation, interview, and documentation for collecting the data. Two types of data were collected, namely primary and secondary data. The result of ISM analysis on the data found that the geology of Sembalun area is the remains of an old volcano which has gone through destruction process with today’s remains’ characteristics of rough, rocky and steep ground surface and 550-2250 masl height. The geomorphology of Sembalun is classified into three units, namely morphology of steep volcano, morphology of sloping volcanic hills, and morphology of denudational plains. Sloping volcanic hills stretch from the northwestern to the southwestern areas and some in the southeastern area as a part of protected forest and national park of Mount Rinjani. The slope is between 30-70 degrees and arranged by volcanic rocks. Policy directions of geothermal potential are 1) as geothermal power plants for power sources, 2) geothermal energy for crop drying, 3) geothermal energy for sterilization of planting media in the future, and 4) geothermal energy for tourism sector.

scholarly journals Nisyros Volcanic Island: A Geosite through a Tailored GIS Story

Geosciences ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 132
Author(s):  
Varvara Antoniou ◽  
Paraskevi Nomikou ◽  
Dimitrios Panousis ◽  
Effrosyni Zafeirakopoulou
Keyword(s):  
Spatial Data ◽  
Hot Springs ◽  
Volcanic Rocks ◽  
Data Communication ◽  
Aegean Sea ◽  
Volcanic Island ◽  
Eastern Aegean ◽  
Strongly Connected ◽  
Historical Heritage ◽  
Available Information

The volcanic island of Nisyros (Greece) is here presented as it presents unique characteristics being a Quaternary volcano in the eastern Aegean Sea, composed of volcanic rocks, and featuring a central caldera that is surrounded by volcanic domes and thick lavas. Its history is strongly connected to the volcano impressing the visitors with steaming hydrothermal craters, intensive smell of sulfur and fumarolic gases, and hot springs. Due to its morphology and geographical position, its cultural and historical heritage has been unchanged in time, bequeath to the island plenty of churches, monasteries with hagiographic frescoes, castles, caves, and spas. To present the geodiversity, the cultural environment, and the biodiversity of this geosite, a relatively new geographic approach was used, ESRI Story Maps. Being web-based applications, they are widespread as an interactive responsive tool used for spatial data communication and dissemination, by combining thematic 2D and 3D webmaps, narrative text, and multimedia content. Such applications can be an ideal way for presenting the available information of places characterized as geosites or protected areas worldwide, providing quick access to the available information to a broader, non-technical audience, developing the interest, and possibly motivating the public to learn more or visit them.

NMR contribution in sub-horizontal well for porosity-permeability heterogeneity characterization in limestones: implications for 3D reservoir prediction and flow simulation in a world class geothermal aquifer

2021 ◽  
Author(s):  
Maxime Catinat ◽  
Benjamin Brigaud ◽  
Marc Fleury ◽  
Miklos Antics ◽  
Pierre Ungemach ◽  
...  
Keyword(s):  
Geothermal Energy ◽  
Horizontal Well ◽  
Gamma Ray ◽  
Flow Simulation ◽  
High Density ◽  
Reservoir Prediction ◽  
Nmr Data ◽  
Geothermal Potential ◽  
Facies Associations ◽  
Deep Geothermal Energy

<p>With around 50 heating networks today operating, the aera around Paris is the European region which concentrates the most heating network production units in terms of deep geothermal energy. In France, the energy-climate strategy plans to produce 6.4TWh in 2023, compared to 1.5TWh produced in 2016. Despite an exceptional geothermal potential, the current average development rate of 70MWh/year will not allow this objective to be achieved, it would be necessary to reach a rate of 6 to 10 times higher. The optimization of the use of deep geothermal energy is a major challenge for France, and in Ile-de-France, which has a population of nearly 12 million inhabitants. This project aims to reconstruct and simulate heat flows in the Paris Basin using an innovative methodology (1) to characterize, predict and model the properties of reservoirs (facies, porosity, permeability) and (2) simulate future circulations and predict the performance at a given location (sedimentary basin) on its geothermal potential. This study focuses on a high density area of well infrastructures around Cachan, (8 doublets, 1 triplet in 56 km<sup>2</sup>). A new sub-horizontal doublet concept has been recently (2017) drilled at Cachan to enhance heat exchange in medium to low permeability formations. Nuclear Magnetic Resonance (NMR T2) logs have been recorded in the sub-horizontal well (GCAH2) providing information on pore size distribution and permeability. We integrated all logging data (gamma ray, density, resistivity, sonic, NRM T2) of the 19 wells in the area and 120 thin section observations from cuttings to derive a combined electrofacies-sedimentary facies description. A total of 10 facies is grouped into 5 facies associations coded in all the 19 wells according to depths and 10 3rd order stratigraphic sequences are recognized. The cell size of the 3D grid was set to 50 m x 50 m for the XY dimensions. The Z-size depends on the thickness of the sub-zones, averaging 5 m. The resulting 3D grid is composed of a total of nearly 8.10<sup>5</sup>cells. After upscaled, facies and stratigraphic surfaces are used to create a reliable model using the “Truncated Gaussian With Trends” algorithm. The petrophysical distribution “Gaussian Random Function Simulation” is used to populate the entire grid with properties, included 2000 NMR data, considering each facies independently. The best reservoir is mainly located in the shoal deposits oolitic grainstones with average porosity of 12.5% and permeability of 100 mD. Finally, hydrodynamic and thermal simulations have been performed using Pumaflow to give information on the potential risk of interference between the doublets in the area and advices are given in the well trajectory to optimize the connectivity and the lifetime of the system. NMR data, especially permeability, allow to greater improve the simulations, defining time probabilities of thermal breakthrough in an area of high density wells.</p>

scholarly journals Techno-Economic Simulation of a Geothermal Energy Generation System at the Machin Volcano in Colombia

2020 ◽  
Author(s):  
Hernando Enrique Rodriguez Pantano ◽  
Valentina Betancourt ◽  
Juan S. Solís-Chaves ◽  
C. M. Rocha-Osorio
Keyword(s):  
Geothermal Energy ◽  
Energy Generation ◽  
Generation System ◽  
Energy Potential ◽  
Public And Private ◽  
Mountain Ranges ◽  
Cost Of Energy ◽  
Geothermal Potential ◽  
Economic Simulation ◽  
Private Investors

Colombian geothermal potential for power generation is interesting due to the presence of the three Andean mountain ranges and the existence of active volcanoes in junction with springs and underground reservoirs with the consequent closeness of available hydrothermal water-wells. The Machin volcano is a small mountain placed in the middle of the country, that has a considerable geothermal potential with wells in a temperature range of 160 to 260C. For that reason, a techno-economic simulation for a Geothermal Energy Generation System is proposed in this paper, using for that the System Advisor Model software. The purpose of this research is to present a more encouraging picture for public and private investors interested in exploiting this energy potential in Colombia. Simulation results include technical and economic aspects as annual and monthly energy production, geothermal resource monthly average temperature, and the Time Of Delivery Factors are also considered. Some tables with system configuration, plant and pump costs, Capacity Factor, and real and nominal Levelized Cost of Energy are also shown.

scholarly journals Application of heat-flow techniques to geothermal energy exploration, Leach Hot Springs area, Grass Valley, Nevada

1977 ◽  
Author(s):  
J.H. Sass ◽  
J.P. Ziagos ◽  
H.A. Wollenberg ◽  
R.J. Munroe ◽  
D. E. di Somma ◽  
...  
Keyword(s):  
Heat Flow ◽  
Geothermal Energy ◽  
Hot Springs ◽  
Flow Techniques

scholarly journals ANALISIS FINANSIAL USAHA PEMBENIHAN IKAN LELE SANGKURIANG (Clarias gariepinus) DI DESA TATELI DUA KECAMATAN MANDOLANG KABUPATEN MINAHASA PROVINSI SULAWESI UTARA

2016 ◽  
Vol 4 (7) ◽  
Author(s):  
Maria Binei ◽  
Victoria E.N. Manoppo ◽  
Djuwita R.R. Aling
Keyword(s):  
Return On Investment ◽  
Financial Analysis ◽  
Clarias Gariepinus ◽  
Profit Rate ◽  
Hatchery Fish ◽  
Operating Profit ◽  
North Sulawesi ◽  
One Year ◽  
Break Even Point ◽  
The Village

Abstrak Penelitian ini bertujuan untukmengetahui kelayakan usaha pembenihan ikan lele sangkuriang (Clarias gariepinus) di Desa Tateli Dua Kecamatan Mandolang Kabupaten Minahasa Provinsi Sulawesi Utara dari aspek finansialnya dan Untuk mendeskripsikan faktor-faktor apa saja yang turut mempengaruhi dalam usaha pembenihan ikan lele sangkuriang (Clarias gariepinus) di Desa Tateli Dua Kecamatan Mandolang Kabupaten Minahasa Provinsi Sulawesi Utara. Berdasarkan hasil analisis secara finansial, usaha pembenihan ikan lele sangkuriang di Desa Tateli Dua tersebut sangat layak dijalankan karena semua nilai Operating Profit positif , Profit Rate dari usaha tersebut mencapai 31%, nilai BCR > 1, usaha tersebut termasuk kategori sangat baik karena mempunyai nilai rentabilitas >100%, BEP atau titik impas tidak sama yaitu BEP penjualan Rp. 8.607.285, BEP satuan 8.197 ekor. tingkat pengembalian investasi dari usaha pembenihan ikan lele sangkuriang tersebut sangat layak dijalankan karena dapat mengembalikan investasi kurang dari 1 tahun, yaitu 0,5 tahun. Kata Kunci : Analisis Finansial, Usaha, Pembenihan Ikan Lele Sangkuriang, Kecamatan Mandolang Abstrack This study aims to determine the feasibility of hatchery fish catfish (Clarias gariepinus) in the village of Tateli Two sub district Mandolang Minahasa North Sulawesi province of aspects of financial and To describe what factors are also influencing the business hatchery fish catfish (Clarias gariepinus) Village Tateli Two subdistrict Mandolang Minahasa North Sulawesi Province. Based on the analysis in the financial, business hatchery fish catfish in the village Tateli Two is very viable for all grades Operating Profit positive, Profit Rate of the effort reaches 31%, the value of BCR> 1, these efforts included the very good category because it has the value of earnings > 100%, BEP or break-even point at which the sale of BEP Rp. 8,607,285, 8,197 units BEP tail. the return on investment of catfish fish hatchery operations is very viable because it can recover the investment of less than one year, which is 0.5 years. Keywords: Financial Analysis, Business, Catfish Hatchery Sangkuriang, District Mandolang

scholarly journals A Thorough Analysis of Potential Geothermal Project Locations in Afghanistan

2020 ◽  
Vol 12 (20) ◽  
pp. 8397
Author(s):  
Ali Mostafaeipour ◽  
Seyyed Jalaladdin Hosseini Dehshiri ◽  
Seyyed Shahabaddin Hosseini Dehshiri ◽  
Mehdi Jahangiri ◽  
Kuaanan Techato
Keyword(s):  
Geothermal Energy ◽  
Multi Criteria Decision Making ◽  
Ratio Analysis ◽  
Project Implementation ◽  
Vikor Method ◽  
Geothermal Potential ◽  
Criteria Weights ◽  
Product Assessment ◽  
Current Energy ◽  
Suitable Location

In recent decades, many countries have shown a growing interest in the use of renewable energies for power generation. Geothermal energy is a clean and environmentally friendly source of renewable energy that can be used to produce electricity and heat for industrial and domestic applications. While Afghanistan has undeniably good geothermal potential that can be utilised to alleviate the country’s current energy limitations, so far this potential has remained completely untapped. In this study, the suitability of 21 provinces for geothermal project implementation in Afghanistan was evaluated using multiple multi-criteria decision-making (MCDM) methods. The stepwise weight assessment ratio analysis (SWARA) method was used to weigh each criterion while the additive ratio assessment (ARAS) method was used to rank potential geothermal sites. The technique for order of preference by similarity to ideal solution (TOPSIS), the vlse kriterijumsk optimizacija kompromisno resenje (VIKOR), and the weighted aggregated sum product assessment (WASPAS) methods were also used in this study. These rankings were then examined via sensitivity analysis which indicated that a 5% change in criteria weights altered the rankings in all methods except the VIKOR method. Volcanic dome density was ranked the most important criteria. All the methods identified Ghazni province as the most suitable location for geothermal project implementation in Afghanistan.

Development of Free Nitric acid, Non-P Desmut Solution for Surface Treatment Aluminium Alloys

2008 ◽  
Vol 569 ◽  
pp. 309-312
Author(s):  
Seong Ho Son ◽  
Dae Chol Kwon ◽  
Do Won Jeong
Keyword(s):  
Sulfuric Acid ◽  
Nitric Acid ◽  
Aluminium Alloys ◽  
Electrochemical Treatment ◽  
Ammonia Nitrogen ◽  
Ammoniacal Nitrogen ◽  
Chemical Reagents ◽  
Ammonium Group ◽  
Acid Type ◽  
Environment Regulation

The purpose of this study is to develop non nitric acid desmut to cope with environment regulation and at the same time, to obtain the effect comparable to nitric acid in removing smut. For this, some desmut solutions were produced adding 2~3 chemical reagents to basic components such as peroxide, ammonium group, ferric group compounds and acid. And, electrochemical treatment was tried to remove ammoniacal nitrogen(NH3-N) in desmut solution after desmut treatment. Consequently, we could gain smut-removing ratio of 90% using the solution mixed with peroxide, ammonium group, ferric group compounds and sulfuric acid at 35°C for 70 seconds, and the ratio is almost the same with that using nitric acid type desmut solution. In this work, most nitrogen(T-N) was confirmed to be ammoniacal nitrogen(NH3-N). In addition, we succeeded in controlling ammonia-nitrogen below 60 ppm corresponding to environment regulation by electrochemical treatment in the wastewater.

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