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Bulletin of Scientific Contribution : Geology
Published by Universitas Padjadjaran
ISSN : 16934873     EISSN : 2541514X     DOI : doi.org/10.24198/bsc%20geology.v18i1
Core Subject : Science, Social, Engineering,
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Environmental Science
BSC Geology adalah jurnal yang dikelola oleh Fakultas Teknik Geologi Universitas Padjadjaran,terbit 3 kali dalam setahun (April, Agustus, dan Desember), yang menerbitkan karya tulis ilmiah dalam bidang kebumian terutama yang berkaitan dengan geologi seperti : Petrologi Paleontologi Geomorfologi Stratigrafi Geologi Dinamik Geologi Lingkungan dan Hidrogeologi Geologi Teknik Geokimia Geofisika Sedimentologi. Setiap artikel yang akan diterbitkan adalah bersifat tanpa biaya (no processing charges dan no submission charges). Dewan redaksi dan penerbit tidak pernah meminta bayaran untuk penerbitan pada jurnal ini. Tujuan dari jurnal ini adalah untuk memperkaya pengetahuan dan informasi tentang ilmu kebumian dan dapat dimanfaatkan untuk kemaslahatan bersama.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi
Articles 419 Documents
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HIERARCHICAL 3D MODELING IN COMPLEX CARBONATE RESERVOIR by COMBINING DETERMINISTIC AND STOCHASTIC APPROACH Natasia, Nanda; Alfadli, Muhammad Kurniawan
Bulletin of Scientific Contribution Vol 17, No 2 (2019): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (647.238 KB) | DOI: 10.24198/bsc.v17i2.23128

Abstract

ABSTRACTThis paper shows how to model the 3d complex carbonate reservoir by combining deterministic and stochastic method. 3d facies model is the most important step in building reservoir static model because the distribution of another properties will depends on this model. a good facies model is needed in building a good model. The nature complexity of carbonate facies  itself makes the modeling are even more chalangging. Deterministic geological interpretation is  modelled by trend modeling while the rock type distribution is distributed inside each facies stochastically. This field is divided into five zones. These zones represent depositional cycle occurred within carbonate formation. The facies is divided into four facies; Reef, Lagoon, Platform, and slope. a reservoir rock type was done by using RT distributions.  According to Geological concept, reservoir quality distributions have different trend either vertical or horizontal. Horizontally, a good reservoir should be located in Reef facies and the poor reservoir quality should be located in slope facies. Vertically, reservoir quality should get better from bottom to top in every reservoir zoneKeywords: Pore types, Diagenetic prosses, Carbonate Reservoir
EROSI DAN SEDIMENTASI DI DAERAH ALIRAN SUNGAI (DAS) CITARUM HULU DAN UMUR OPERASIONAL PLTA SAGULING -, Edi Tri Haryanto
Bulletin of Scientific Contribution Vol 11, No 2 (2013): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1035.504 KB) | DOI: 10.24198/bsc.v11i2.8289

Abstract

Upper Citarum Catchments Area which is a function as buffer of Saguling Dam, has been pressuring to bear heavy loads. Various studies have been done, but still required analysis, discussion and identification of sources of erosion, and sedimentation that affect the operational life time of Saguling Hydroelectric Power Dam . The rate of erosion and sedimentation analysis done based on secondary data research / previous measurement. Satellite imagery "Google-earth" was interpreted, then performed field observation. Change of land use / land cover imply for increasing the value of CP. Total erosion in the upper Citarum Catchment was 15,206,301 tons / ha / yr. Deposition in the reservoir in 2002 was 4,197,152 tons, so the "Sediment delivery ratio" was 27.6%. Based on deposition data in reservoirs of the Year 1987-2007, the operational life time of hydroelectric power is expected to 56 years from 59 years of planned or "dead storage" will be exceeded in 1942.. 
PENGARUH KEMIRINGAN LERENG TERHADAP LAJU SEDIMENTASI PADA RENCANA BENDUNGAN PARIGI Yusuf, Muhammad Farhan; Siahaan, Yakub; Sukiyah, Emi; Mulyo, Agung; Patonah, Aton; Zakaria, Zufialdi
Bulletin of Scientific Contribution Vol 16, No 2 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (769.386 KB) | DOI: 10.24198/bsc.v16i2.17922

Abstract

Pembangunan Bendungan Parigi akan sangat bermanfaat untuk kepentingan masyarakat. Bendungan ini akan digunakan untuk keperluan pertanian (irigasi) dan persediaan air baku. Lokasi Rencana Bendungan Parigi terletak pada sub-DAS Parigi yang memiliki luas 57,98 km2. Dalam perencanaan bendungan aspek sedimentasi sangat penting. Aspek ini akan berkaitan dengan desain Bendungan. Pada DAS yang tidak terlalu luas, laju sedimentasi setara dengan laju erosi. Perhitungan laju sedimentasi dilakukan berdasarkan fungsi erosi dengan metode Universal Soil Loss Equation (USLE) dan SDR. Metode ini berhubungan dengan faktor – faktor yaitu erodibilitas tanah, curah hujan, tataguna lahan, dan topografi. Faktor kemiringan lereng erat kaitannya terhadap laju sedimentasi, penelitian ini akan membahas tentang peranan kemiringan lereng  terhadap laju sedimentasi. Nilai laju sedimentasi hasil perhitungan menggunakan metode USLE yaitu  sebesar 149,53 ton/ha/th.  Hasil perhitungan statistik dengan  metode regresi linier di dapat bahwa faktor kemiringan lereng berpengaruh signifikan terhadap laju sedimentasi dengan persamaan regresi Y’ = 15,32 + 7,313X. Nilai koefisien regresi (r) sebesar 0,697 menunjukkan bahwa ada hubungan yang kuat antara kemiringan lereng (X) dan laju sedimentasi (Y). Pengaruh yang diberikan oleh aspek kemiringan lereng terhadap laju sedimentasi adalah sebesar 48,6 %.
STRUKTUR LIPATAN ANJAKAN DAERAH WALAT, SUKABUMI, JAWA BARAT -, Iyan Haryanto; -, Edy Sunardi; -, Adjat Sudradjat; -, Suparka
Bulletin of Scientific Contribution Vol 9, No 1 (2011): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (616.388 KB) | DOI: 10.24198/bsc.v9i1.8257

Abstract

Walat hills in the area of Sukabumi, has a pattern of east-west trending ridge. Hills line orientation is controlled by the structure of fold with is followed by formation of reverse fault. Both of geological structures is formed on the same tectonic period, on Plio-Plistocene. Position of the axis of the fold and reverse fault parallel relative to each other, based on the tectonic formation occurs in the same period, it can be classified as a pattern of thrust folds structure. Of some reverse faults that developed in Walat Area, the reverse fault whose position to northward is major reverse fault, so that by referring to the model structure of Boyer and Elliote (1982), it can be classified as a leading thrust system. This structural pattern is controling topographical differences of the hills with plain morphology in northern.
IMPLICATION OF FRACTURE DENSITY ON UNSERPENTINIZED ULTRAMAFIC ROCKS TOWARD CHARACTERISTICS OF SAPROLITE ZONE IN SOROWAKO, SOUTH SULAWESI Wibowo, Setiyo; Rosana, Mega Fatimah; Haryanto, Agus Didit
Bulletin of Scientific Contribution Vol 15, No 2 (2017): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v15i2.13375

Abstract

ABSTRACTUsage of nickel-containing materials has increased over time in accordance with economic growth. The largest worldwide nickel resources occur in surface laterite deposits that have formed during chemical weathering of ultramafic rocks where the area that represent one of largest nickel reserves in Indonesia is Sorowako. This study aims to identify the characteristics of saprolite zone on unserpentinized ultramafic-hosted of nickel laterite deposit in Sorowako. Based on depth profile of nickel content in lateritic deposit, it is known that the Ni grades reach a maximum in saprolite zones so that identification of factors affecting the characteristics of saprolite zone is indispensable. Fracture density on ultramafic bedrocks played the important roles during laterisation and each fractures density type has the implication toward the saprolite zones. By classification of fracture density, high to medium fractured types of bedrocks indicated the thick saprolite zone while the low to unfractured types are thinner. Saprolite zones of high to medium fractured type are more silicified than others due to the originality of silica accumulation occupied along opening fractures and joints. High silica content which is commonly present on lower layer of saprolite zone should to be aware especially when the Ni grade still above the cut-off which potentially affected to ore grade dilution. ABSTRAKPenggunaan material berbahan nikel telah mengalami peningkatan dari waktu ke waktu seiring dengan pertumbuhan ekonomi. Sumberdaya nikel terbesar di dunia terjadi pada endapan laterit di permukaan yang terbentuk selama proses pelapukan kimiawi dari batuan ultramafik dimana salah satu lokasinya dengan tingkat cadangan nikel terbesar di Indonesia berada di Sorowako. Studi ini bertujuan untuk mengidentifikasi karakteristik zona saprolit endapan nikel laterit pada batuan ultramafik tak terserpentinisasi di Sorowako. Berdasarkan profil kedalaman terhadap kandungan nikel pada endapan laterit, telah diketahui bahwa kadar Ni mencapai maksimum dalam zona saprolit sehingga identifikasi terhadap faktor-faktor yang mempengaruhi karakteristik zona saprolit sangat diperlukan. Densitas rekahan pada batuan ultramafik berperan penting selama proses lateritisasi dan setiap tipe densitas rekahan memiliki implikasi terhadap zona saprolit. Melalui klasifikasi densitas rekahan, tipe rekahan berdensitas tinggi hingga sedang pada batuan dasarnya mengindikasikan zona saprolit yang tebal sedangkan zona saprolit pada tipe densitas rekahan rendah hingga tanpa rekahan lebih tipis. Zona saprolit dengan tipe rekahan tinggi hingga sedang lebih tersilisifikasi dibandingkan dengan tipe lainnya disebabkan oleh akumulasi alamiah dari silika yang bertempat di sepanjang bukaan rekahan atau kekar. Kandungan silika tinggi yang umumnya terdapat di lapisan bawah zona saprolit seharusnya diwaspadai terutama ketika kadar Ni-nya masih diatas ambang keekonomian yang berpotensi menyebabkan dilusi pada kadar bijih. 
EKSPLORASI BIJIH BESI DENGAN METODE DIPOLE-DIPOLE DAN GEOMAGNET DI WILAYAH GANTUNG, KABUPATEN BLITUNG TIMUR, PROVINSI BLITUNG -, Andi Agus Noor
Bulletin of Scientific Contribution Vol 6, No 2 (2008): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1217.238 KB) | DOI: 10.24198/bsc.v6i2.8163

Abstract

The geological distribution of iron ore in the area of research is relatively east-west with the thickness varies between 3-10 meters. Configuration subsurface geology of the results obtained with the method of exploration geophysics dipole-dipole and geomagnet.From the results of the exploration can be concluded that the distribution of iron ore almost evenly in all the track in the depth of 20 - 30 meters
OPTIMALISASI PEMANFAATAN SISTEM AGROFORESTRI SEBAGAI BENTUK ADAPTASI DAN MITIGASI TANAH LONGSOR Rendra, Pradnya Raditya; Sulaksana, Nana; Alam, Boy Yoseph C.S.S.S.
Bulletin of Scientific Contribution Vol 14, No 2 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (683.169 KB) | DOI: 10.24198/bsc.v14i2.9797

Abstract

Landslide is a natural disaster that often occur in Indonesia and cause a significant impact. Landslide may occur due to static factor (slope) and dynamic factor (land use). Landslide mitigation can be done to prevent the negative impact of landslide. Landslide mitigation through slope stabilization can be done with vegetative technique. Vegetative technique as a landslide mitigation with sustainable land production is also known as agroforestry. Agroforestry is a land use systems made by various technologies through the utilization of annual crops, perennial crops, and/or livestock , either alternately or at the same time in a certain period to form ecological, social, and economic interactions. Agroforestry system has more advantages than other land use systems. One of the advantage of this system is can be used on steep slope area. Multistory agroforestry system can prevent landslide by forming soil organic material, improving soil structure, and making soil more stable. Utilization of multistory agroforestry system with various types of storied canopy trees considered as appropiate landslide mitigation because the closure of canopy tress are tightly and stratified, their root system is excellent, and the soil cover such as grasses and shrubs is important to prevent landslide. Furthermore, agroforestry system can also be used to produce food crops, fodder, honey, building materials, and medicinal materials. Keyword : Agroforestry, mitigation, slope, landslide. Tanah longsor merupakan bencana alam yang sering terjadi di Indonesia dan menimbulkan dampak cukup besar. Tanah longsor dapat terjadi akibat faktor statis (kemiringan lereng) dan faktor dinamis (tata guna lahan). Mitigasi tanah longsor dilakukan untuk mencegah dampak negatif tanah longsor. Mitigasi tanah longsor melalui stabilisasi lereng dapat dilakukan dengan rekayasa vegetatif. Rekayasa vegetatif sebagai mitigasi tanah longsor dengan produksi lahan berkelanjutan tersebut disebut juga sebagai sistem agroforestri. Agroforestri merupakan sistem penggunaan lahan yang dilakukan dengan berbagai teknologi melalui pemanfaatan tanaman semusim, tanaman tahunan, dan/atau ternak dalam waktu bersamaan atau bergiliran pada periode tertentu sehingga terbentuk interaksi ekologi, sosial, dan ekonomi. Sistem agroforestri memiliki lebih banyak kelebihan dibandingkan sistem penggunaan lahan lain. Salah satu kelebihan sistem ini adalah dapat digunakan pada lahan berlereng curam. Sistem agroforestri multistrata dapat mencegah tanah longsor dengan membentuk bahan organik tanah, memperbaiki struktur tanah, dan membuat tanah menjadi lebih stabil. Pemanfaatan sistem agroforestri multistrata dengan berbagai jenis tanaman tajuk bertingkat dinilai sebagai langkah tepat mitigasi tanah longsor karena adanya penutupan tajuk pepohonan yang rapat dan bertingkat, sistem perakaran yang sangat baik, serta penutup tanah berupa rerumputan dan semak belukar yang sangat penting untuk menghindari tanah longsor. Selain itu, sistem agroforestri juga dapat dimanfaatkan sebagai penghasil bahan pangan, pakan ternak, madu, bahan bangunan, dan bahan obat. Kata kunci :Agroforestri, mitigasi, lereng, longsor.
PERUBAHAN KARAKTERISTIK ELEKTROMAGNETIK MENGGUNAKAN METODE GROUND PENETRATING RADAR HUBUNGANNYA DENGAN KARAKTERISTIK SEDIMEN BAWAH PERMUKAAN -, Andi Agus Nur
Bulletin of Scientific Contribution Vol 5, No 1 (2007): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1052.114 KB) | DOI: 10.24198/bsc.v5i1.8129

Abstract

Ground Penetrating Radar one of a Geophysics methods with principally to elektromagnetics wave reflection which is caused by changes of electromagnetics characteristics (contrast of material dielectric) in subsurface. The product data is a 2D profil that interpreted later from configuration reflection pattern on data to determine type of the sediment.
KELIMPAHAN POLEN DAN SPORA ENDAPAN CHANNEL DELTA MAHAKAM -, Winantris
Bulletin of Scientific Contribution Vol 10, No 2 (2012): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (494.966 KB) | DOI: 10.24198/bsc.v10i2.8280

Abstract

In the delta area there aretwo type of channelsnamely distributary channel and tidal channel. Both controlthe supply of sedimentforming thedelta. Channel is an open areaof vegetation.Channel justovergrown by plant water, but channel gets pollen and spore from the vegetation growing arround it. The aim of research is to know abundance of pollen and spore are deposted in the channel,to be usedas a guidedeposition environment and study provenance. The avarage pollen and spores in the sediment distributary channelat 47.73 grain per sampleincluded poor category and average pollen and spores in the tidal channel at 66.85 grain per sampleincluded in themoderately rich category. The abundance of pollen in the deposit of tidal channel is higher than deposit of distributary channel, while the abundance of fern sporeswere not significantly differentbetween the two channel.
IDENTIFIKASI MINERAL LEMPUNG PADA ENDAPAN HIDROTERMAL PROSPEK TABOBO-MALIFUT, HALMAHERA UTARA PROVINSI MALUKU UTARA Madi, Almun; Syafri, Ildrem; Rosana, Mega Fatimah
Bulletin of Scientific Contribution Vol 16, No 1 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (889.665 KB)

Abstract

Daerah penelitian terletak di Desa Tabobo, Kecamatan Malifut, Kabupaten Halmahera Utara, Provinsi Maluku Utara. Daerah penelitian juga merupakan bagian dari areal ekplorasi (IUP) PT. Beringin Halmahera Mineral. Secara geografis, daerah penelitian terletak pada koordinat 127049’- 127047’19 BT dan 1011’-1011’ LU. Penelitian ini bertujuan untuk mengidentifikasi mineral-mineral lempung yang terdapat di lokasi Tabobo. Metode penelitian yang dilakukan adalah survey lapangan, analisis laboratorium berupa analisis petrografi dan X-Ray Diffraction. Berdasarkan hasil penelitian di lapangan dan analisis laboratorium, teridentifikasi mineral-mineral lempung seperti klorit, smektit montmorillonit, halloysit dan kaolinit. Hasil ini dapat dikatakan bahwa tipe alterasi mineral lempung Tabobo lebih menunjukkan pada tipe mineralisasi epitermal sulfida rendah.Kata kunci: Tabobo, Lempung, Mineral.

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