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Jurnal Geosaintek
Published by Institut Teknologi Sepuluh Nopember Surabaya
ISSN : 24609072     EISSN : 25023659     DOI : https://doi.org/10.12962/j25023659
Core Subject : Science,
Earth & Planetary Sciences
Jurnal Geosaintek mempublikasikan dan menerbitkan hasil kajian, penelitian, penerapan ilmu pengetahuan serta teknologi di bidang kebumian
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Ilmu Bumi dan Planet (Lain-Lain)
Articles 243 Documents
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MINERALOGY AND MICROSTRUCTURE OF RANTAU DEDAP'S GEOTHERMAL RESERVOIR: HYDROTHERMAL ALTERATION INSIGHTS Welayaturromadhona Welayaturromadhona; Firman Sauqi Nur Sabila; Mauliate Agustinus Hamonangan Sihotang; Luthfi Rindra Salam; Fifi Izzati
Jurnal Geosaintek Vol. 11 No. 3 (2025)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v11i3.8982

Abstract

The Great Sumatra Fault controls the Rantau Dedap geothermal system in South Sumatra. It is a high-temperature volcano-tectonic system. This study presents a comprehensive mineralogical and microstructural examination of core samples from three deep wells (UJ-A1, UJ-B1, and UJ-C1) at depths ranging from 1,840 to 2,313 m, aiming to elucidate hydrothermal alteration and its impact on reservoir quality. X-ray Diffraction (XRD) and Scanning Electron Microscopy-Energy Dispersive X-ray Spectroscopy (SEM-EDS) analyses demonstrate a distinct propylitic alteration zonation correlated with increasing depth and temperature. UJ-A1 (1840 m) is mainly made up of oligoclase, microcline, and quartz. UJ-B1 (2142 m) is mainly made up of oligoclase-quartz. UJ-C1 (2313 m) is mainly made up of anorthite-quartz with more iron. Anorthite, a calcium-rich plagioclase that stays stable above 280 °C, is found at greater depths. This means that the area is close to a major upflow zone. SEM microstructural analysis reveals hydrothermal breccia textures, characterized by angular fragments within a matrix of secondary minerals, and indicates secondary porosity resulting from mineral alteration. These characteristics suggest that hydraulic brecciation resulting from tectonic activity is essential for the creation and preservation of reservoir permeability. The reservoir's potential is enhanced because it lacks smectite-type clays, which typically block pores. In general, these results indicate that Rantau Dedap is a structurally controlled upflow zone characterized by deep mafic lithologies. The anorthite-quartz assemblage stands out as a key sign for future high-temperature geothermal exploration.
ANALISIS SEKATAN SESAR PADA SEGMEN ZONA SESAR LEMATANG CEKUNGAN SUMATERA SELATAN: IMPLIKASI TERHADAP MIGRASI HIDROKARBON Shinta Ayu Puspita; Benyamin Sapiie; Indra Gunawan; Aveliansyah Aveliansyah
Jurnal Geosaintek Vol. 11 No. 3 (2025)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v11i3.8985

Abstract

Sesar Lematang merupakan salah satu struktur utama di Cekungan Sumatera Selatan yang berperan penting dalam mengontrol pola deformasi, sedimentasi, dan sistem petroleum. Sesar Lematang berfungsi sebagai batas morfotektonik aktif yang terbentuk sejak fase ekstensional Eosen–Oligosen dan mengalami reaktivasi pada fase kompresi Miosen–Plio-Plistosen. Penelitian ini bertujuan untuk mengidentifikasi kerangka struktur dan mengevaluasi kemampuan sekatan (fault sealing capacity) Sesar Lematang berdasarkan integrasi data seismik 2D, data sumur, dan analisis petrofisika. Metode yang digunakan meliputi interpretasi seismik struktural untuk menentukan bidang dan geometri sesar, analisis petrofisika untuk menghitung kandungan lempung (Vshale), serta perhitungan Shale Gouge Ratio (SGR) guna menilai kemampuan sekatan sesar. Hasil perhitungan menunjukkan nilai SGR berkisar antara 47–61% dengan rata-rata sekitar 54%. Kombinasi kedua parameter tersebut. Implikasi hasil penelitian ini menunjukkan bahwa segmen-segmen Sesar Lematang berpotensi membentuk perangkap bertipe fault-bounded dan perangkap kombinasi stratigrafi-struktural yang baik bagi akumulasi hidrokarbon. Oleh karena itu, pemahaman terhadap kerangkas struktur dan perilaku sekatan Sesar Lematang menjadi aspek penting dalam strategi eksplorasi dan pengembangan migas di Cekungan Sumatera Selatan
SEISMOTECTONIC STUDY OF THE SIBOLANGIT, NORTH SUMATRA REGION BASED ON DOUBLE-DIFFERENCE RELOCATION Nesia S. Marbun; Aulia A. Aisjah; Anne M. M. Sirait; Yusran Asnawi; Hendro Nugroho; Andrean V. H. Simanjuntak
Jurnal Geosaintek Vol. 11 No. 3 (2025)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v11i3.8986

Abstract

Sumatra is one of the most seismically active regions in the world due to the oblique convergence between the Indo-Australian and Eurasian plates, where strain is partitioned between the Sunda megathrust and the Great Sumatran Fault (GSF). While most seismicity in North Sumatra occurs along mapped strands of the GSF, several damaging earthquakes have occurred outside known fault zones, raising critical questions about hidden seismogenic structures. This study investigates the seismotectonic framework of the Karo region, with a focus on the 2017 Karo earthquake (Mw 5.6), using the double-difference relocation method. A dataset of local earthquakes recorded by the Indonesian Agency for Meteorology, Climatology, and Geophysics (BMKG) was analyzed to refine hypocenter locations, reduce uncertainties, and identify seismic clusters. Relocation results significantly improved spatial resolution, reducing average location errors to less than 3 km, and revealed clustered seismicity along a northwest–southeast trending structure offset from the Renun Fault. Depth cross-sections indicate brittle faulting within the upper crust (5–12 km), and the aftershock alignment suggests the presence of an unmapped subsidiary fault accommodating dextral shear. Comparisons with similar studies across Sumatra and Java confirm that off-fault seismicity is a common but often overlooked contributor to regional hazard. These findings underscore the importance of integrating relocated seismicity into national hazard models to account for hidden faults. By providing improved fault geometry and seismotectonic insights, this study enhances the understanding of earthquake sources in North Sumatra and supports future efforts in seismic hazard mitigation and disaster risk reduction in one of Indonesia’s most vulnerable regions.
THE SMART ARCHIPELAGO: AN AI FRAMEWORK FOR ENERGY RESILIENCE IN EASTERN INDONESIA Dionisius Aprisal Fenanlampir; Ginas Alvianingsih
Jurnal Geosaintek Vol. 12 No. 1 (2026): Special Issue: Energynovation Ideas Competition in Collaboration with Pertamin
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v12i1.9225

Abstract

As the world’s largest archipelagic country, Indonesia relies on maritime logistics for energy distribution, particularly in the eastern region, which is vulnerable to extreme weather. This study validates the feasibility of The Smart Archipelago framework, an artificial intelligence (AI)-based decision support system designed to enhance the resilience of energy logistics. The case study focuses on a disruption event in the Ambon-Sorong shipping route in May 2023, analyzing three main modules: integration of oceanographic, meteorological, and operational data; predictive analytics through the comparison of four machine learning models (Logistic Regression, SVM, Random Forest, LightGBM); and a prescriptive module based on economic feasibility analysis. Results show that the tuned SVM achieved the best performance on the test set (F1-score 0.63), while tuned Logistic Regression demonstrated the highest stability in cross-validation. The gross cost-benefit ratio reached 429% for a single idealized avoidance scenario; however, after adjusting for prediction uncertainty based on the model’s precision (0.62), the model-adjusted ROI is approximately 291%, which remains economically favorable. Sensitivity analysis across conservative to optimistic operational assumptions confirmed the robustness of this economic justification. These results are supported by a heuristic recommendation system based on key variables such as wave height and current speed. These findings confirm the potential of The Smart Archipelago to be implemented on multi-year historical data as a step toward predictive and adaptive maritime logistics systems.
DIGIMO: MODULAR IOT-BASED BIOGAS AND BIO-SLURRY SYSTEM FOR LIVESTOCK ENERGY TRANSITION Giza Unika Anantasa
Jurnal Geosaintek Vol. 12 No. 1 (2026): Special Issue: Energynovation Ideas Competition in Collaboration with Pertamin
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v12i1.9235

Abstract

The transformation of livestock waste into renewable energy presents a promising pathway to support Indonesia's low carbon energy transition, especially in rural communities. This paper introduces DIGIMO (Digester Modular IoT and Bio- Slurry), an innovative biogas system designed for small scale farming villages. DIGIMO integrates three key innovations: a modular digester design that allows scalable and flexible installation based on the number of livestock, a low cost IoT based monitoring system using sensors to track temperature, gas pressure, and gas volume for optimal fermentation, and a bio-slurry refinement unit that converts biogas residue into high-nutrient organic liquid fertilizer. The biogas produced is primarily distributed directly to local households for cooking and daily energy use, reducing their reliance on fossil-based fuels. Meanwhile, the processed slurry provides additional economic value as a sustainable agricultural input. This model not only reduces greenhouse gas emissions but also promotes circular economy principles by closing the loop between energy and agriculture. The proposed DIGIMO system aims to be replicable across Indonesia’s rural areas, combining environmental benefits, energy security, and rural economic empowerment. This paper highlights the design, process flow, and potential impacts of DIGIMO as a feasible low carbon energy business innovation for Indonesia’s sustainable energy future.
AGRISTEC: SMART AGRIVOLTAIC WASTEWATER RECYCLING SYSTEM FOR DECENTRALIZED LOW-CARBON ENERGY BUSINESS IN RURAL AREAS: AN INTEGRATED APPROACH TO SUSTAINABLE AGRICULTURE AND RENEWABLE ENERGY GENERATION Ghifari Jauhar Yajri
Jurnal Geosaintek Vol. 12 No. 1 (2026): Special Issue: Energynovation Ideas Competition in Collaboration with Pertamin
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v12i1.9240

Abstract

Indonesia’s rural agriculture, particularly in Praya Barat, Lombok, faces critical challenges from unreliable irrigation and centralized diesel-based electricity. Despite high solar potential (5.24 kWh/m²/day), over 6,287 hectares of rice fields suffer from drought, while key water sources are contaminated by domestic and agricultural waste. Limited access to sustainable energy further undermines productivity and food security. The proposed solution, AGRISTEC, a decentralized agrivoltaic wastewater treatment system integrating bifacial PV, solar-powered electrocoagulation, and IoT automation. It consists of a 600W bifacial panel, 72V/100Ah LiFePO₄ battery, MPPT controller, 12V submersible pump, and electrolysis cell managed by an ESP32 microcontroller. Real-time monitoring via TDS, pH, and ORP sensors enables dynamic voltage and flow rate adjustments for irrigation-grade water. System performance was analyzed using HOMER Pro simulation for energy modeling and Excel-based calculations for techno-economic analysis. AGRISTEC generates 8.63 kWh/day and treats up to 960 L/day of wastewater, achieving 99.9% E. coli inactivation and 95% contaminant removal. Lifecycle emissions are reduced to 123.8 gCO₂/kWh over 24.5 times lower than diesel-based alternatives (3,336 gCO₂/kWh). Land-use efficiency is enhanced through vertical APV integration, covering only 12.93 m² per user (45% shading ratio), allowing dual land productivity for food and energy. Cost analysis reveals a 36.8% reduction in total ownership cost compared to diesel-based systems over 25 years. AGRISTEC offers a scalable, low-carbon solution for enhancing water-energy resilience in Indonesia’s underserved agricultural communities.
A-GATECH: GREEN INNOVATION OF IOT-PHOTOVOLTAIC MICROALGAE FROM E-WASTE-FOR- CAPTURE CO₂ DECARBONIZATION AND BIODIESEL PRODUCTION SUPPORTING LOW-CARBON ENERGY BUSINESS Bayu Aji
Jurnal Geosaintek Vol. 12 No. 1 (2026): Special Issue: Energynovation Ideas Competition in Collaboration with Pertamin
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v12i1.9241

Abstract

Global carbon dioxide (CO₂) emissions reached 36.8 billion tons in 2023, with industry and transportation contributing more than 65%. In Indonesia, emissions have increased by an average of 3.5% per year, highlighting the urgent need for effective mitigation solutions that also generate economic value. Therefore, this study focuses on the development of A-Gatech (Algae-based Green Technology), an innovation utilizing a tubular photobioreactor made from electronic glass waste (e-waste), powered by solar energy, and equipped with an IoT-based control system. The aim of this research is to design, test, and analyze the performance of A-Gatech in capturing CO₂ while simultaneously producing biodiesel as an economically valuable product. The research steps include a literature review, prototype design, laboratory validation, limited trials, field testing, and technical as well as economic feasibility analysis using the Technology Readiness Level (TRL) approach. Simulation and statistical results show that A-Gatech can capture up to 653 tons of CO₂ per hectare per year with an efficiency of 1.8 kg/m²/day, produce up to 198,000 liters of biodiesel per hectare per year valued at approximately IDR 1.98 billion, and reduce electronic waste by around 10 tons annually. Business feasibility analysis indicates that the production break-even point (BEP) can be achieved at 21 units per month, with a profit margin of around 65%. In conclusion, A-Gatech is feasible for implementation as it not only contributes to climate change mitigation but also supports the circular economy and creates green jobs. This innovation is aligned with the Sustainable Development Goals, particularly Goal 7 (Affordable and Clean Energy), Goal 11 (Sustainable Cities and Communities), Goal 12 (Responsible Consumption and Production), and Goal 13 (Climate Action).
GREENFUSION: SYNTHESIS OF NEXT-GENERATION GREEN DIESEL FUEL THROUGH HYDRODEOXYGENATION OF NYAMPLUNG AND UCO Muhammad Ilham Rizky Maulana; Fahri Sinulingga
Jurnal Geosaintek Vol. 12 No. 1 (2026): Special Issue: Energynovation Ideas Competition in Collaboration with Pertamin
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v12i1.9269

Abstract

The urgency of the energy transition in Indonesia is becoming increasingly pressing due to the country's high dependence on fossil fuels and the presence of 5 million diesel vehicles. This research introduces "GreenFusion," a method for synthesizing green diesel to overcome the limitations of conventional biodiesel. The objective is to investigate the hydrodeoxygenation of a dual non-food feedstock mixture, specifically Calophyllum inophyllum (Nyamplung) oil and used cooking oil (UCO). The approach involves synthesizing a nickel-silver catalyst on natural zeolite (NiAg/ZH) and conducting the hydrodeoxygenation process in a batch reactor at temperatures between 325°C and 375°C. The results confirm the successful synthesis of high-quality green diesel with an estimated yield of 91,2% and a cetane number of 75. Environmental impact projections at the pilot scale indicate significant potential for reducing UCO waste and lowering CO2 emissions by over 1,200 tons per year. Therefore, GreenFusion presents a technically viable and environmentally superior pathway for producing drop-in fuel, supporting Indonesia's goal of achieving the 2060 Net Zero Emissions (NZE) target.
RECLAIMING THE SHORELINE WITH MODULAR BIOCARBON: SEAWEED AND FLY ASH BEYOND CARBON COLONIALISM Maysahra Ramadhani
Jurnal Geosaintek Vol. 12 No. 1 (2026): Special Issue: Energynovation Ideas Competition in Collaboration with Pertamin
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v12i1.9274

Abstract

“Why do the exploited drown in climate debt, while the polluters sail free, taxless, shameless, and unaccountable?” Coastal ecosystems are among the Earth’s most vital yet vulnerable frontlines, threatened by erosion, seawater intrusion, sea level rise, and the compounding effects of climate change. These risks not only endanger marine biodiversity but also fracture the socio-economic lifelines of communities who did the least to cause the crisis. This innovation introduces Modular Biocarbon Technology, a nature-based, community-driven solution constructed from seaweed, a fast-growing carbon-absorbing biomass, and fly ash, an industrial byproduct rich in pozzolanic compounds. These two materials are fused into adaptive, site-specific modules that reduce wave energy, capture sediment, support marine biodiversity recovery, and most critically, serve as permanent carbon sinks through biochar stabilization. In the era of global climate injustice, where nations like Indonesia are expected to act as planetary lungs without equitable compensation. This solution reframes our ecological burden as a modular climate asset. It offers leverage in the global carbon debt discourse, asserting that frontline communities deserve agency, not austerity. Aligned with SDGs 11, 13, and 14, this solution is scalable, replicable, and deeply rooted in local participation. It empowers coastal actors to reclaim degraded shorelines, while catalyzing a circular economy that transforms industrial waste into tools of resistance and regeneration. By bridging environmental science, material innovation, and social equity, this initiative provides a bold, implementable blueprint for coastal resilience, carbon justice, and national decarbonization.
EUGLENA MARINE BIOFUEL INNOVATING SUSTAINABLE LOW CARBON ENERGY FOR THE FUTURE OF SHIPPING Miftakhul Naim
Jurnal Geosaintek Vol. 12 No. 1 (2026): Special Issue: Energynovation Ideas Competition in Collaboration with Pertamin
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v12i1.9309

Abstract

The maritime sector accounts for nearly 3% of global greenhouse gas (GHG) emissions and is under increasing pressure to decarbonize. This paper presents a concept for an integrated port–ship biofuel supply chain utilizing Euglena gracilis  wax ester co-processed with waste cooking oil (WCO), drawing on advancements by Euglena Co., Ltd in Japan. The proposed pathway integrates large-scale hybrid  raceway fermenter cultivation, energy-efficient wet extraction using liquid dimethyl ether (DME), catalytic upgrading to drop-in green diesel/HEFA, and valorization of co-products. The inclusion of WCO expands lipid feedstock diversity, supports circular economy objectives, and lowers production costs. Literature-based techno-economic analysis (TEA) and life cycle assessment (LCA) indicate strong potential for producing renewable marine fuels that comply with international shipping fuel regulations. A phased R&D roadmap is outlined, featuring pilot trials on harbor tugboats integrated with renewable energy and CO₂ capture, aligning with Indonesia’s Asta Cita Point 5 on downstream industrialization and Point 2 on green economy and advancing SDG 7 and SDG 13 through a sustainable maritime biofuel value chain.

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