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Journal of Geoscience Engineering and Energy (JOGEE)
Published by Universitas Trisakti
ISSN : 27155358     EISSN : 27226530     DOI : https://doi.org/10.25105/jogee.v3i2.13860
Core Subject : Science, Education, Engineering,
Civil Engineering, Building, Construction & Architecture Education Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics
The main aim of the Journal Geoscience Engineering and Energy (JOGEE) is to provide an open access platform to the articles that resulted of high-quality research works related with the geoscience and energy field. This is open for papers of geology (petrology; volcanology and geothermal; sedimentology and stratigraphy; paleontology; structural geology and seismology; petroleum geosciences; mineral deposits and coal mining; remotee sensing,; hidrogeology; marine geology and oceanography; geological engineering; environmental and geohazard mitigation; and also geotourism), geophysics (physical geology; exploration Geophysics), geochemistry, energy of renewable (geothermal; ..)and non-renewable energy (petroleum engineering; G&G method; mineral deposits, coal and energy resources management),dll. The Journal Geoscience Engineering and Energy (JOGEE) welcome the submission of manuscripts that meet the general criteria of significance and scientific excellence. It caters to the requirements of the geologist, researchers, academicians and also students, lab professional, and industry that is involved in geoscience studies. This journal publishes 2 numbers per year at least 8-9 articles. Papers will be published approximately 14 days after acceptance.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 139 Documents
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GROUTING MERUPAKAN CARA PERBAIKAN YANG TEPAT PADA DASAR PONDASI RIVERBED BENDUNGAN SADAWARNA, SUBANG, JAWA BARAT: GROUTING IS THE RIGHT WAY TO REPAIR THE RIVERBED FOUNDATION OF THE SADAWARNA DAM, SUBANG, WEST JAVA Rachmayanti, Zarah; Ronoatmojo, Imam Setiaji; Fitra Yuda, Himmes
Journal of Geoscience Engineering and Energy VOLUME 6, NOMOR 1, FEBRUARI 2025
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jogee.v6i1.22157

Abstract

Dibangunan Bendungan, terdapat beberapa konstruksi yaitu main dam, riverbed, spillway, saddle dam dan masih banyak lagi. Dibagian riverbed yaitu fondasi bagian dari sungai atau aliran air yang tertahan di belakang bendungan. Dasar sungai juga berfungsi untuk menyalurkan air ketika air mengalir melalui spillway atau saluran pelepasan. Hal tersebut guna memenuhi persyaratan yang mengacu pada pedoman keamanan bendungan dari Kementerian PUPR. Evaluasi geologi teknik yang rinci perlu diberikan pada kondisi dasar fondasi, khususnya pada struktur saddle dam. Grouting menjadi salah satu teknik yang digunakan untuk memperbaiki dan meningkatkan efisiensi dasar fondasi guna memastikan keamanan dan stabilitas bangunan. Maka dari itu, fondasi bendungan wajib kedap air untuk mencegah rembesan atau kebocoran. Salah satu cara untuk mem perbaiki kerusakan yang disebabkan oleh deformasi struktur tanah atau batuan adalah dengan melakukan perbaikan fondasi dengan grouting. Pada umumnya kondisi tanah/batuan yang memiliki bidang diskontinuitas di bawah permukaan akibat kekar. Kondisi demikian akan menyebabkan nilai permeabilitas pada tanah /batuan tersebut menjadi tinggi. Hal ini akan menimbulkan kebocoran yang dapat mengakibatkan terjadinya kerusakan bendungan. Perbaikan yang perlu dilakukan  adalah dengan mengurangi rembesan air sehingga angka koefisien permeabilitas nya (nilai Lugeon) menjadi kecil. Untuk perbaikan fondasi tersebut dapat ditangani dengan menggunakan teknik injeksi semen (grouting) yang dilakukan pada bagian paling buruk kelas batuannya dan paling tinggi angka koefisien permeabilitasnya (nilai lugeon). In the dam building, there are several constructions, including main dam, riverbed, spillway, saddle dam and others. The riverbed section is the foundation of the part of the river or water flow that is blocked behind the dam. The riverbed also functions to channel water when the water flows through a spillway or release channel. This is to fulfill the requirements that refer to the dam safety guidelines from the Ministry of PUPR. A detailed engineering geological evaluation needs to be given to the basic condition of the foundation, especially the saddle dam structure. Grouting is one of the techniques used to repair and increase the efficiency of the foundation base to ensure the safety and stability of the dam. Therefore, the dam foundation must be watertight to prevent seepage or leaks. One way to repair damage caused by deformation of soil or rock structures is to repair the foundation with grouting. In general, soil/rock conditions have areas of discontinuity below the surface due to joints. Such conditions will cause the permeability value of the soil/rock to be high. This will cause leaks which can result in dam damage. Improvements that need to be made are to reduce water seepage so that the permeability coefficient (Lugeon value) becomes small. Foundation repairs can be handled using cement injection techniques (grouting) which are carried out on the parts with the worst rock class and the highest permeability coefficient (lugeon value).
OPTIMASI LOG DATA UNTUK ANALISIS PETROFISIKA DI LAPANGAN JGA, FORMASI BEKASAP, CEKUNGAN SUMATRA TENGAH: OPTIMIZATION OF LOG DATA FOR PETROPHYSICAL ANALYSIS IN THE JGA FIELD, BEKASAP FORMATION, CENTRAL SUMATRA BASIN Gabrielle, Juan; Herdiansyah, Firman; Koesmawardani, Wildan Tri
Journal of Geoscience Engineering and Energy VOLUME 6, NOMOR 1, FEBRUARI 2025
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jogee.v6i1.22191

Abstract

Penelitian ini bertujuan untuk meningkatkan akurasi analisis petrofisika melalui normalisasi gamma ray, penanganan badhole, dan koreksi densitas. Data logging sering menghadapi tantangan kualitas akibat deformasi lubang bor, variasi alat ukur, dan efek lingkungan. Hasil penelitian menunjukkan bahwa normalisasi gamma ray efektif dalam menghilangkan variasi alat ukur, sementara penanganan badhole memastikan koreksi data logging pada area dengan deformasi. Koreksi densitas juga memberikan hasil yang lebih representatif terkait sifat asli batuan. Pendekatan ini diharapkan dapat meningkatkan keandalan analisis petrofisika untuk mendukung pengelolaan reservoir hidrokarbon. This study aims to enhance the accuracy of petrophysical analysis through gamma ray normalization, badhole handling, and density correction. Data logging often faces quality challenges due to borehole deformation, measurement tool variations, and environmental effects. The results demonstrate that gamma ray normalization effectively eliminates measurement tool variations, while badhole handling ensures corrected logging data in deformed areas. Density correction provides more representative results related to the actual rock properties. This approach is expected to improve the reliability of petrophysical analysis in supporting hydrocarbon reservoir management.
ANALISIS GEOMORFOLOGI DAN POTENSI GEOWISATA DI RUMPIN, BOGOR, JAWA BARAT: GEOMORPHOLOGICAL ANALYSIS AND GEOTOURISM POTENTIAL IN RUMPIN, BOGOR, WEST JAVA Mubarak, Naufal Razan Al; Fitra Yuda, Himmes; Nuryana, Suherman Dwi
Journal of Geoscience Engineering and Energy VOLUME 6, NOMOR 1, FEBRUARI 2025
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jogee.v6i1.22239

Abstract

Daerah Rumpin, Jawa Barat, memiliki keanekaragaman geomorfologi, seperti perbukitan, lembah, sungai, dan batuan vulkanik hasil aktivitas gunung api masa lalu, menjadikannya potensial sebagai destinasi geowisata. Penelitian ini mengidentifikasi karakteristik geologi utama, meliputi geomorfologi, komposisi batuan (batupasir, batugamping, breksi, andesit), struktur geologi (lipatan dan sesar), serta mengevaluasi potensi geowisata menggunakan metode Kubalikova (2013), yang mencakup pengamatan lapangan, analisis laboratorium, dan evaluasi sumber daya mineral. Hasilnya menunjukkan lanskap Rumpin dipengaruhi oleh proses geologis kompleks, memiliki keindahan alam mendukung wisatawan, serta sumber daya mineral seperti andesit yang penting bagi ekonomi lokal. Tantangan utama adalah infrastruktur terbatas dan perlunya konservasi lingkungan. Berdasarkan pendekatan Kubalikova, rekomendasi difokuskan pada pengemba ngan geowisata berkelanjutan untuk meningkatkan ekonomi lokal sambil menjaga kelestarian alam, dengan mengintegrasikan aspek geologi dan pariwisata secara harmonis. The Rumpin area in West Java, Indonesia, features diverse geomorphological attractions, including hills, valleys, rivers, and volcanic rocks from past volcanic activity, making it a potential geotourism destination. This study identifies key geological characteristics, including geomorphology, rock composition (sandstone, limestone, breccia, and andesite), and geological structures (folds and faults), while evaluating geotourism potential using the Kubalikova (2013) methodology, which includes field observations, laboratory analysis, and mineral resource evaluation. The findings reveal that Rumpin's landscape, shaped by complex geological processes, offers natural beauty that supports tourism and mineral resources, such as andesite, which are vital to the local economy. Key challenges include limited infrastructure and the need for environmental conservation. Based on Kubalikova's approach, the recommendations focus on sustainable geotourism development to enhance the local economy while preserving the natural heritage by integrating geological and tourism aspects harmoniously.
STUDI PERBANDINGAN KESTABILAN LERENG DENGAN VARIASI KEMIRINGAN LERENG PADA LAPANGAN “X” DAERAH LAHAT, SUMATRA SELATAN: COMPARATIVE STUDY OF SLOPE STABILITY WITH SLOPE VARIATIONS IN FIELD “X” LAHAT, SOUTH SUMATRA Koro, Margaretha Inggrid Wuno; Ronoatmojo, Imam Setiaji
Journal of Geoscience Engineering and Energy VOLUME 6, NOMOR 1, FEBRUARI 2025
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jogee.v6i1.22244

Abstract

PT Berkah Daya Sukses merupakan salah satu perusahaan tambang batubara yang berada di Kabupaten Lahat, Sumatra Selatan. Analisis kestabilan lereng ini penting dilakukan di daerah pertambangan karena berkaitan dengan pendapatan dan juga keselamatan dari pekerja yang berada di kawasan tersebut. Dilakukan perhitungan Faktor Keamanan dengan menggunakan software Slide 6.0 dengan membuat dua pemodelan antara litologi yang sudah terkena deformasi atau memiliki dip (real di lapangan) dan litologi yang belum terkena deformasi (asumsi) dengan lima kemiringan yang berbeda  mulai dari kemiringan 55o, kemiringan 50o, kemiringan 45o, kemiringan 40o, dan kemiringan 35o untuk mengetahui pengaruh dip terhadap kestabilan lereng. Diperoleh hasil faktor keamanan untuk litologi yang memiliki dip yaitu 0,902; 0,989; 1,116; 1,204; dan 1,298 dan untuk litologi datar yaitu 1,022; 1,157; 1,221; 1,273; dan 1,315. Dari perhitungan yang telah dilakukan menunjukkan bahwa kemiringan litologi ini cukup berpengaruh terhadap kestabilan lereng pada daerah penelitian hal ini ditunjukkan dengan angka faktor keamanan pada litologi datar lebih stabil daripada litologi dengan dip hal ini disebabkan oleh lereng yang litologinya mempunyai dip menghasilkan intensitas rembesan yang lebih banyak dibandingkan dengan lereng yang tidak memiliki dip (litologi datar). Berbedanya intensitas rembesan pada dua pemodelan ini karena pada litologi dengan dip adanya kontak antar pada setiap lapisan yang dapat menjadi jalan keluarnya air sedangkan pada litologi datar air cenderung menyebar lebih merata dan terarah sehingga kemungkinan untuk terjadi rembesan lebih sedikit. Rembesan yang terjadi ini akan meningkatkan tekanan pori serta mempengaruhi gaya geser sehingga kestabilan lereng pada litologi dengan dip lebih tidak stabil. PT Berkah Daya Sukses is one of the coal mining companies located in Lahat Regency, South Sumatra. This slope stability analysis is important to carry out in mining areas because it is related to income and also the safety of workers in the area. The calculation of the Safety Factor was carried out using Slide 6.0 software by making two models between lithology that has been affected by deformation or has a dip (real in the field) and lithology that has not been affected by deformation (assumption) with five different slopes starting from slope 55o, slope 50o, slope 45o, slope 40o and slope 35o to determine the effect of dip on slope stability. The results of the safety factor for lithology that have a dip of 0.902 were obtained; 0,989; 1,116; 1,204; and 1,298 and for flat lithology, which is 1,022; 1,157; 1,221; 1,273; and 1,315. From the calculations that have been carried out, it is shown that the slope of this lithology is quite influential on the stability of the slope in the study area, this is shown by the number of safety factors in flat lithology is more stable than lithology with dip, this is due to slopes whose lithology has dip, resulting in more seepage intensity compared to slopes that do not have dip (flat lithology). The difference in seepage intensity in these two modeling is because in lithology with dip there is contact between each layer which can be the outlet of water, while in flat lithology water tends to spread more evenly and directionally so that there is less possibility of seepage. This seepage will increase the pore pressure and affect the shear force so that the slope stability in lithology with dips is more unstable.
ANALISIS KESTABILAN LERENG BERDASARKAN SIFAT FISIK DAN MEKANIK TANAH PADA GRAHA TAMAN SARI, KECAMATAN RUMPIN, KABUPATEN BOGOR: ANALYSIS OF SLOPE STABILITY BASED ON THE PHYSICAL AND MECHANICAL PROPERTIES OF THE SOIL AT GRAHA TAMAN SARI, RUMPIN DISTRICT, BOGOR REGENCY Wiranto, Muhammad Yudha; Yuda, Himmes Fitra; Sugiarto, Eddy
Journal of Geoscience Engineering and Energy VOLUME 6, NOMOR 1, FEBRUARI 2025
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jogee.v6i1.22246

Abstract

Stabilitas lereng merupakan faktor krusial dalam pengelolaan wilayah berbukit, terutama di kawasan yang berkembang pesat seperti Graha Taman Sari, Kecamatan Rumpin. Ketidakstabilan lereng di daerah ini dapat meningkatkan risiko longsor yang berpotensi membahayakan lingkungan, infrastruktur, dan masyarakat. Penelitian ini bertujuan untuk menganalisis kestabilan lereng berdasarkan sifat fisik dan mekanik tanah, serta memberikan rekomendasi mitigasi risiko. Metode yang digunakan melibatkan pengambilan sampel tanah di lapangan dan pengujian laboratorium untuk menentukan sifat fisik tanah (kadar air, berat volume, dan indeks plastisitas) dan sifat mekanik tanah (kohesi dan sudut geser dalam). Selain itu, tanah diklasifikasikan berdasarkan sistem AASHTO. Stabilitas lereng dianalisis menggunakan Limit Equilibrium Method (LEM) dengan pendekatan Morgenstern–Price untuk menghitung faktor keamanan (safety factor) berbagai kondisi lereng. Geologi Graha Taman Sari terdiri atas dua satuan utama: batupasir yang berselingan dengan batulempung serta endapan aluvial. Hasil menunjukkan bahwa satuan batulempung, dengan kohesi rendah dan sudut geser kecil, lebih rentan terhadap longsor, terutama pada kondisi jenuh air akibat curah hujan tinggi. Salah satu lereng curam dengan dominasi material lempung menunjukkan faktor keamanan kurang dari 1,25, mengindikasikan ketidakstabilan dan perlunya perkuatan. Rekomendasi mitigasi meliputi terasering, pengelolaan drainase untuk mengurangi infiltrasi air, serta pembatasan aktivitas manusia di sekitar lereng rawan. Penelitian ini menegaskan bahwa metode LEM dengan pendekatan Morgenstern–Price efektif untuk mengevaluasi stabilitas lereng dan dapat menjadi acuan dalam mitigasi bencana serta perencanaan wilayah di Graha Taman Sari. Slope stability is a critical aspect of managing hilly areas, especially in rapidly developing regions such as Graha Taman Sari, Rumpin District. Slope instability in this area increases the risk of landslides, posing threats to the environment, infrastructure, and local communities. This study aims to analyze slope stability based on the physical and mechanical properties of the soil and provide risk mitigation recommendations. The methodology involved field sampling and laboratory tests to determine soil physical properties (water content, bulk density, and plasticity index) and mechanical properties (cohesion and internal friction angle). The soil was also classified according to the AASHTO system. Slope stability was analyzed using the Limit Equilibrium Method (LEM) with the Morgenstern–Price approach to calculate the safety factor under various slope conditions. The geology of Graha Taman Sari consists of two main units: sandstone interbedded with claystone and alluvial deposits. The results indicate that claystone units, with low cohesion and a small internal friction angle, are more prone to landslides, especially when saturated due to high rainfall. One steep slope dominated by clay material was found to have a safety factor of less than 1.25, indicating instability and the need for reinforcement. Mitigation recommendations include terracing, improved drainage management to reduce water infiltration, and controlling human activities in landslide-prone areas. This study highlights the effectiveness of the LEM approach using the Morgenstern–Price method for slope stability evaluation and provides a valuable reference for disaster mitigation and land-use planning in Graha Taman Sari.
GEOLOGI DAERAH KARANGDUWET DAN SEKITARNYA, KECAMATAN PALIYAN, KABUPATEN GUNUNGKIDUL, PROVINSI DAERAH ISTIMEWA YOGYAKARTA: GEOLOGY OF THE KARANGDUWET AREA AND ITS SURROUNDINGS, PALIYAN SUBDISTRICT, GUNUNGKIDUL REGENCY, SPECIAL REGION OF YOGYAKARTA PROVINCE Salam, Ilham Fikri; Hafiz, Surya Darma; Jambak , Moehammad Ali
Journal of Geoscience Engineering and Energy VOLUME 6, NOMOR 1, FEBRUARI 2025
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jogee.v6i1.22259

Abstract

Zona Pegunungan Serayu merupakan bagian dari Cekungan Jawa Tengah yang identik dengan terendapkannya batuan sedimen volkaniklastik dan batuan karbonatan. Desa Karangduwet, Kecamatan Gunungkidul merupakan salah satu bagian dari Zona Pegunungan Serayu, sehingga pemetaan geologi di daerah ini sangat menarik dilakukan untuk mengetahui proses terendapkannya siklus batuan sedimen volkaniklastik dan batuan karbonat untuk menginformasikan tentang kondisi geologi dan sejarah geologi. Penelitian ini menggunakan metode deskriptif analitik yang dibagi menjadi tahapan kajian lapangan dan tahapan analisis data. Desa Karangduwet dan sekitarnya tersusun atas Satuan Batugamping Klastik Tufaan berumur Miosen Tengah‒Akhir, Satuan Batugamping Terumbu terendap kan secara menjemari terhadap Batugamping Klastik Tufaan dan Satuan Batunapal Tufaan terendapkan secara menjemari dengan Batugamping Klastik Tufaan pada Miosen Akhir. Struktur geologi yang terjadi pada lokasi ini setelah proses pengendapan seluruh batuan terjadi setelah pengendapan batuan selesai berupa perlipatan sinklin dan sesar geser mendatar. The Serayu mountain zone is part of the Central Java basin, identical to volcaniclastic sedimentary and carbonate rocks deposition. Karangduwet Village, Gunung Kidul Subdistrict, is a part of the Serayu Mountains Zone, so geological mapping in this area is very interesting to do to find out the process of deposition of volcaniclastic sedimentary rock cycles and carbonate rocks to inform about geological conditions and geological history. This study used a descriptive- analytic method divided into field study and data analysis stages. Karangduwet Village and its surroundings are composed of Mid-Late Miocene Tuffaceous Clastic Limestone Units, Reef Limestone units deposited interfingered with Tuffaceous Clastic Limestone and Tuffaceous Marlstone units deposited interfingered with Tuffaceous Clastic Limestone in the Late Miocene. The geological structures at this location after the deposition of all the rocks occur after the deposition of the stones complete in syncline folds and horizontal shear faults.
KARAKTERISTIK ALTERASI SKARN DAN DISTRIBUSI MINERAL SULFIDA PEMBAWA TEMBAGA DI TAMBANG BIG GOSSAN LEVEL 2860L-2940L FOOTWALL WEST, PAPUA, INDONESIA: CHARACTERISTICS OF SKARN ALTERATION AND SULPHIDE MINERAL BEARING COPPER DISTRIBUTION AT BIG GOSSAN MINE 2860L-2940L FOOTWALL WEST, PAPUA, INDONESIA Amalina, Nur; Meirawaty, Mira; Sonbait, Daniel; Burhannudinnur, Muhammad; Hafiz, Surya Darma; Rendy; Koesmawardani, Wildan Tri; Wijaya, Budi
Journal of Geoscience Engineering and Energy VOLUME 6, NOMOR 1, FEBRUARI 2025
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jogee.v6i1.22289

Abstract

Tambang Big Gossan di Papua Tengah dikenal dengan mineralisasi tembaga yang terbentuk akibat intrusi diorit pada batuan karbonatan Formasi Waripi. Penelitian ini bertujuan menganalisis karakteristik alterasi dan mineralisasi tembaga di level 2860, 2900, dan 2940 Footwall West. Metode yang digunakan termasuk pemetaan geologi dan analisis laboratorium (petrografi, mineragrafi, dan XRD). Hasilnya, ditemukan empat satuan litologi serta lima zona alterasi, yaitu klinopiroksen-garnet-kuarsa, epidot-klorit-kuarsa-kalsit, garnet-kuarsa-kalsit-piro pilit-epidot, piropilit-kuarsa-kalsit, dan aktinolit-kuarsa-klorit. Mineral sulfida tembaga utama adalah kalkopirit dan bornit, dengan pirit, pyrrhotite, dan magnetit sebagai mineral pembawa besi. Tembaga terakumulasi pada zona retrograde alterasi 2, 3, 4, dan 5. The Big Gossan mine in Central Papua is known for its copper mineralization, formed due to diorite intrusion into the carbonate rocks of the Waripi Formation. This study aims to analyze the characteristics of alteration and copper mineralization at levels 2860, 2900, and 2940 Footwall West. The methods used include geological mapping and laboratory analyses (petrography, mineragraphy, and XRD). The results revealed four lithological units and five alteration zones: clinopyroxene-garnet-quartz, epidote-chlorite-quartz-calcite, garnet-quartz-calcite-pyrophyllite-epidote, pyrophyllite-quartz-calcite, and actinolite-quartz-chlorite. The main copper sulfide minerals are chalcopyrite and bornite, with pyrite, pyrrhotite, and magnetite as iron-bearing minerals. Copper is concentrated in the retrograde alteration zones 2, 3, 4, and 5.
ANALISIS PETROFISIKA PADA LAPISAN D, H, DAN I, FORMASI DURI, LAPANGAN “TAN”, CEKUNGAN SUMATRA TENGAH: PETROPHYSICAL ANALYSIS IN D, H, AND I LAYERS, DURI FORMATION, “TAN” FIELD, CENTRAL SUMATRA BASIN Khamisah, Dinda Putri; Benyamin
Journal of Geoscience Engineering and Energy VOLUME 6, NOMOR 1, FEBRUARI 2025
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jogee.v6i1.22293

Abstract

Penelitian ini bertujuan untuk menganalisis petrofisika di Formasi Duri, Cekungan Sumatera Tengah menggunakan data log dan core. Metode yang digunakan meliputi integrasi data log sumur (well log) dan data inti sumur (core) untuk mengidentifikasi karakteristik petrofisika dan sifat-sifat batuan reservoir. Data log diproses dan dianalisis untuk memperoleh informasi tentang litologi, porositas, saturasi air, dan permeabilitas. Sementara itu, data core digunakan untuk memvalidasi interpretasi log serta untuk mengevaluasi properti fisik dari contoh batuan. Hasil analisis menunjukkan Formasi Duri, Cekungan Sumatera Tengah memiliki nilai porositas efektif yaitu 8,34% – 34% dan nilai permeabilitas 2,26 mD – 4432,2 mD. Batuan yang dominan ditemui meliputi berbagai kombinasi antara batupasir dan shale dengan karakteristik greywacke. This study aims to analyze the petrophysical in Duri Formation, Central Sumatra Basin using log data and core data. The methods used include the integration of well log data and well core data to identify the petrophysical characteristics and properties of reservoir rocks. Log data are processed and analyzed to obtain information on lithology, porosity, water saturation, and permeability. Meanwhile, core data are used to validate log data interpretations and evaluate the physical properties of rock samples. The results of the analysis show that the Duri Formation, Central Sumatra Basin has a porosity value of 8,34% – 34% and a permeability value of 2,26 mD – 4432,2 mD. The dominant rocks encountered include various combinations of sandstone and shale with greywacke characteristics.
A REVIEW OF GEOPHYSICS STUDY OF GRAPHITE OCCURRENCES IN BALAI SEBUT COMPLEX, SANGGAU, WEST KALIMANTAN Maulana, Rizki Fajar; Sulyana, Deska; Meirawaty, Mira; Yuda, Himmes Fitra; Hendrasto, Fajar; Wijaya, Budi; Apriniyadi, Mohammad
Journal of Geoscience Engineering and Energy VOLUME 6, NOMOR 1, FEBRUARI 2025
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jogee.v6i1.22455

Abstract

Graphite is a non-metallic polymorph mineral formed by carbon. Graphite has become indispensable in the worldwide industry due to its widespread applications, such as industrial uses, energy transition, and even electricity. It is a critical anode element for lithium-ion batteries. Graphite has unique physical characteristics. It has a very low specific gravity and is an extraordinarily soft but highly conductive material. It is exceptionally heat-resistant, making it applicable in metallurgy and manufacturing. Due to all characteristics, graphite occurrences in Indonesia are slightly unknown. In contrast, there is a possibility, according to some Palaeozoic metamorphic host graphite in several parts of Indonesia. This study will enlighten early-step exploration of graphite potency in Balai Sebut, Sanggau Regency, and West Kalimantan. We combined airborne and ground geophysics using Active Directory Magnetotelluric (ADMT) tools to estimate graphite distribution on the surface and subsurface. We also did laboratory analysis to validate graphite content using petrography analysis, X-ray diffraction (XRD), and carbon analyzer (LECO) of some representative graphite-bearing rock from fieldwork. Graphite in the research area is exposed to the surface, like in Empiyang, whereas potential graphite in the Terati area lies 0-6 m below the subsurface. Petrographic analysis shows that graphite occurs as flake graphite that is characterized by widespread distribution with low thickness. Both LECO and XRD confirmed the occurrence of these graphite-bearing rocks, with the total amount of graphite ranging from 0.91‒1.58%. This research is expected to provide suggestions in the early stage of graphite exploration based on thematic cases as graphite occurrences in the Balai Sebut area.
KONDISI GEOLOGI UNTUK PERENCANAAN PONDASI BENDUNGAN DI DAERAH BENGKAYANG: GEOLOGICAL ANALYSIS FOR THE FEASIBILITY OF DAM FOUNDATIONS IN THE BENGKAYANG AREA Prasetyo, Yosafat Anugrah; Yuda, Himmes Fitra
Journal of Geoscience Engineering and Energy VOLUME 6, NOMOR 2, AGUSTUS 2025
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/

Abstract

Penelitian ini bertujuan untuk menganalisis kondisi geologi untuk perencanaan pondasi bendungan di daerah Bengkayang menggunakan metode Unconfined Compressive Strength (UCS) dan Standard Penetration Test (SPT). Metode SPT digunakan untuk menentukan parameter perlawanan penetrasi lapisan tanah di lapangan, yang penting untuk identifikasi perlapisan tanah dan desain pondasi bangunan yang dikorelasikan dengan uji UCS untuk mengetahui nilai kuat tekan batuan. Penelitian ini dilakukan dengan beberapa tahap, yaitu pemilihan lokasi survei, pengumpulan data primer dan sekunder, serta pengolahan dan interpretasi data. Hasil penelitian ini diharapkan dapat memberikan rekomendasi terkait penggunaan batuan, desain struktur, dan langkah-langkah mitigasi berdasarkan hasil survei yang dilakukan. Penelitian ini juga diharapkan dapat memberikan kontribusi terhadap pengembangan ilmu geologi teknik, khususnya dalam bidang pertambangan dan teknik pondasi.   This study aims to analyze the geological conditions for dam foundation planning in the Bengkayang area using the Unconfined Compressive Strength (UCS) and Standard Penetration Test (SPT) methods. The SPT method is used to determine the parameters of soil layer penetration resistance in the field, which is important for the identification of soil layer and building foundation design correlated with the UCS test to determine the compressive strength value of rocks. This research was carried out in several stages, namely the selection of survey locations, primary and secondary data collection, and data processing and interpretation. The results of this study are expected to provide recommendations related to the use of rocks, structural design, and mitigation measures based on the results of the survey conducted. This research is also expected to contribute to the development of engineering geology, especially in the field of mining and foundation engineering.

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