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All Journal Bulletin of Scientific Contribution : Geology Jurnal Teknologi Mineral dan Batubara Buletin Sumber Daya Geologi Journal of Geoscience Engineering and Energy (JOGEE) Jurnal Teknologi Mineral dan Batubara Journal of Geosciences and Applied Geology
Nurdrajat Nurdrajat
Fakultas Teknik Geologi Universitas Padjadjaran
Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics

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PEMODELAN GEOLOGI DAN ESTIMASI SUMBER DAYA BATUBARA DI PIT “HMG”, TAMBANG BATUBARA BANKO BARAT, SUMATRA SELATAN: GEOLOGICAL MODELLING AND COAL RESOURCE ESTIMATION IN THE “HMG” PIT, WEST BANKO COAL MINE, SOUTH SUMATRA Adithya Ramadhani Hasibuan; Juniarto, Reinaldi; Nurdrajat; Reza Mohammad Ganjar Gani; Dicky Muslim; M. Dwiki Satrio
Buletin Sumber Daya Geologi Vol. 15 No. 3 (2020): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v15i3.308

Abstract

Indonesia is a country that has a lot of coal deposits, and one of the largest deposits is in Sumatra Island. The Bukit Asam coal mine has had a long history beginning with the Dutch colonial period. Administratively, location of the studied area is located in the area of Bukit Asam coal mine, Tanjung Enim area, Muara Enim Regency, South Sumatra Province. This paper provides the 2D and 3D geological modelling to estimate coal resources in the “HMG” PIT of West Banko Coal Mine. Forty-eight exploratory drill holes data from PT Bukit Asam were used in this study. There were reanalysed and reinterpreted to identify coal characteristics, correlate coal seams, and compile to create subsurface geological models. In an effort to determine coal resources in this area, there were some analytical techniques (criteria or parameter), including geological complexity analysis, coal quality distribution analysis, subsurface mapping to observe the geometry of coal seam distribution and making geological models from the results of drilling activities. The studied objects are seams A1, A2, B1, B2, and C with rank of high volatile B bituminous based on the ASTM Classification. The coal seams distribution shows relatively southeast-northwest trends. Resources classification or estimation in this paper is based on SNI 5015 : 2011, in which the study area is included in the geological complexity of simple geological groups with the distance of inferred resource information 1,000<X≤ 1,500m, designated 500<X≤1,000m, and measured X≤500m. From geological modelling and the Circular Method, estimated coal seam A1 resource is 28,543,893 tons, A2 seam is 31,199,799 tons, seam B1 is 38,638,462 tons, seam B2 is 15,790,222 tons, and seam C is 40,913,153 tons. The total coal resources are 155,085,529 tons.
PEMODELAN GEOLOGI DAN ESTIMASI SUMBER DAYA BATUBARA DI WILAYAH ‘X’. KABUPATEN BERAU, PROVINSI KALIMANTAN TIMUR: GEOLOGICAL MODELING AND ESTIMATION OF COAL RESOURCES IN AREA 'X', BERAU REGENCY, EAST KALIMANTAN PROVINCE Manurung, Jekson; Nurdrajat; Alfadli, Muhammad Kurniawan; Asmoro, Yoki Dwi
Journal of Geoscience Engineering and Energy VOLUME 5, NOMOR 1, FEBRUARI 2024
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jogee.v5i1.18995

Abstract

General geological investigation activities and detailed exploration need to be carried out, so that it can show potential coal resources that can still be developed. The research area is in the PT. Berau Coal concession area, administratively located in Berau Regency, East Kalimantan Province. The research method used in calculating resources in Region 'X' is the Polygon Method, namely by halving the distance between two sample points on one axis to produce an area of ​​influence and refers to moderate complexity based on analysis of the geological conditions of the research area (SNI 5015:2019). This research aims to determine the feasibility of a coal seam to be mined based on aspects of dimensions, quantity and quality of coal distribution, as well as a reference in design and determining appropriate mining methods based on coal geological modeling. Based on ASTM D388-19 of 2004, the research area has a High Volatile B Bituminous coal ranking with an average calorific value (dmmf) of 13111,01 Btu/lb, ash content 4,7%, total sulfur 0,98%, total moisture 21,28%, inherent moisture 16,66%, volatile matter 48,63%, and fixed carbon 51,37%. The total estimated coal resources in the research area are 14.760.000 million tons, consisting of total measured coal resources of 13.380.000 million tons, indicated 930.000 thousand tons, and inferred 410.000 thousand tons.
SEISMIC STRATIGRAPHY ANALYSIS OF 2D SEISMIC CROSS SECTION IN ARAFURA SEA, PAPUA Naufal, Muhammad Audy; Nurdrajat, Nurdrajat; Muljana, Budi; Purwanto, Catur
Journal of Geological Sciences and Applied Geology Vol 4, No 2 (2021): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v4i2.29153

Abstract

Arafura Sea is one of the shallow marine located in eastern Indonesia. This is accommodated based on the bathymetry map of Arafura which has a depth of up to 90 meters. Stratigraphy in eastern Indonesia is quite complex, consisting of rocks aged up to Paleozoic. There have been five tectonic event since Pre-Cambrian until now, namely the pre-rift, syn-rift, passive margins, convergence and compression. The 2D seismic  cross section of line 5 acquired as the result of seismic data processing which is part of the Buru Formation consisting of shale siltstone, sandstone, limestone, calcareous sandstone aged from Late Miocene to Plio-Pleistocene. Bouguer Anomaly data from Buru Formation have a value of 1,8 – 2,2 gr /cc which shows fine grained sediments in the form of silt, clay, and sand which deposited on the continental shelf. 2D Seismic cross section of line 5 shows the direction of sediment deposition obtained from the south which continues to fill the geometry of the basin in the north and divided into 4 seismic facies based on the characteristics of the internal reflector, amplitude, frequency and continuity. From these characteristics, there is a process of changing depositional energy that tends to slow toward the center of the geometry space of the depositional basin so that the resulting sedimentation pattern is uniformed. A fault structure has been identified  which is formed the compressional force due to the presence of convergent tectonics which is perpendicular to the direction of the bedding
CHARACTERISTICS, RANKING, AND POTENTIAL OF COAL ON SEAM H AND SEAM H2 RIZKY, ALIF DILANDY; Nurdrajat, Nurdrajat; Hardiyono, Adi; Salinita, Silti
Journal of Geological Sciences and Applied Geology Vol 7, No 3 (2023): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v7i3.50364

Abstract

Coal is a complex solid object consisting of several chemical elements and comes from plants that are deposited in a basin. The South Sumatra Basin is a basin with the presence of the Muara Enim Formation which is known as a coal-bearing formation. In this research, secondary data was used in the form of proximate analysis, ultimate analysis, and combustion properties analysis results in determining the characteristics, ranking, and potential of coal in the research area. Based on ASTM D 388 – 05 classification, coal in seam H has a Subbituminous B Coal ranking, while seam H2 has a Subbituminous A Coal rating. Based on the parameters in assessing the coal potential use for coal-fired power plants according to Thomas, 2013 in Suhat, et al., 2020, coal in seam H and seam H2 does not support the utilizations, but solutions can be carried out in the form of rewashing sample, coal drying, and coal blending.
GEOMORPHOLOGIC AND STRATIGRAPHIC DETERMINATION USING OUTCROP DATA, THIN SECTION AND MICROFOSSIL ANALYSIS IN BENTARSARI AREA, BREBES DISTRICT, CENTRAL JAVA Dewi, Viska Triaraminta; Nurdrajat, Nurdrajat; Firmansyah, Yusi; Fachrudin, Kurnia Arfiansyah
Journal of Geological Sciences and Applied Geology Vol 2, No 6 (2018): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v2i6.20876

Abstract

Administratively, Bentarsari area was located in Salem Sub-District and Brebes District in Central Java Province with coordinate 108°46’45,15” - 108°49’28.29” BT - 108°39’32.4” BT and 7°7’40.34” LS - 7°10’22.22” LS.  This research aims is to give an understanding about geological condition in geomorphology and stratigraphy aspects which are described by thematic map in 1:12.500 scale within an area of 25km2. This research was accomplished with surface data (outcrop) and field orientation method using of GPS, geological compass, loop, geological hammer, comparator, and any other tools. Afterward, thin section and fossil analysis were also collected to determine the type of rocks and the age of the stratigraphy unit. This research will include the classification of geomorphology unit based on 3 aspects, which are morphography,  morphometry, and morphogenetic and also classification of stratigraphy unit, based on characteristics of rocks such as rock texture, mineral contents and fossil contents. The geomorphology of the Bentarsari region can be divided into 3 (three) geomorphological units, namely: the alluvium high altitude fluvial unit, high hills of steep structural sediments unit, and very steep high structural sedimentary hills unit. While the Litho-stratigraphic on research area divided into 4 (four) units, from the oldest to the youngest stratigraphy position is sandstone unit (Tbp), claystone unit (Tbl), fine-grained sandstone unit (Tpbph), and breccia unit (Qpbx). Thus, by having the result of this research, can be useful as a reference to have further studies in this located area. 
LITOFASIES ANALYSIS IN THE CIPAMINGKIS RIVER ROCK FORMATION JATILUHUR, BOGOR, WEST JAVA. Gani, Reza Mohammad Ganjar; Firmansyah, Yusi; Nurdrajat, Nurdrajat; Fathin, Muhammad Kayis
Journal of Geological Sciences and Applied Geology Vol 5, No 3 (2021): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v5i3.38253

Abstract

The Sedimentary rocks result from the breakdown of previously transported rocks deposited and lithified. Sedimentary rocks cover almost 80% of the earth's crust (Folk, 1974). The research was conducted in the Cipamingkis River, Jonggol District, Bogor Regency, West Java. The research area is included in the Cianjur Regional Geological Map Sheet (Sudjatmiko, 1972) and is included in the Dayeuhkaum Earth Map (1209 – 233) published by the Geospatial Information Agency (BIG). The Jonggol District, Bogor Regency, West Java, has a large river, the Cipamingkis R,iver, stretching from the northeast to the southwest of the study area. This river is included in the Jatiluhur Formation (Sudjatmiko, 1972). The facies is a rock body with a different combination of physical, chemical and biological characteristics from the surrounding rock body, which reflects its original conditions, namely the way it was transported and the way it was deposited. Two bodies of rock deposited simultaneously have different facies if they have differences in their physical, chemical and biological characteristics. Units and sediment structure components in the study area are grouped into six lithofacies: (1) Thin-Medium Sandstone Layer, (2) Massive Claystone, (3) Alternating Sandstone and Claystone, (4) Thick Sandstone Layer, (5) Alternating Fine Sandstone and Very Fine Sandstone, and (6) Slump Deposit. Description of facies by limiting physical and chemical characteristics is called lithofacies, and lithofacies is a facies analysis method by considering information about physical and chemical characteristics of rock layers (Nichols, 2009).
NILAI DAN JENIS POROSITAS BATUPASIR PADA FORMASI WALATDI DAERAH CICANTAYAN, KABUPATEN SUKABUMI BERDASARKAN METODE PETROGRAFI Firmansyah, Yusi; Mardiana, Undang; Kurniawan, Endy; Nurdrajat, .; Gani, Reza Mohammad Ganjar
Bulletin of Scientific Contribution Vol 16, No 3 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (878.6 KB) | DOI: 10.24198/bsc.v16i3.20224

Abstract

ABSTRACTStudy of sandstone porosity Walat Formation in Sukabumi, West Java is a step to get information about the value and type of porosity that develops in this area. Sandstones that have good porosity can potentially become reservoir rocks but not all sandstones have good porosity. Systematic modeling of Walat Formation outcrops which are believed to have potential as reservoir rocks are analyzed in the laboratory to see their porosity. Eight samples were selected and analyzed by petrographic method to determine the type of porosity and calculate the sandstone porosity value of the Walat Formation located in Cicantayan Village, Cisaat District, Sukabumi District. Based on the results of petrographic analysis, all sandstone samples in the study area have intergranular primary porosity and have sufficient to special porosity values. Based on this research, it can be said that in general the sandstones in the study area have very good porosity which has the potential to be a good reservoir rock.Keywords: Walat Formation, sandstone, porosity, petrographic analysis.ABSTRAKKajian porositas batupasir Formasi Walat di Sukabumi, Jawa Barat merupakan suatu langkah untuk mendapatkan informasi mengenai nilai dan jenis porositas yang berkembang pada daerah ini. Batupasir yang memiliki porositas yang baik dapat berpotensi menjadi batuan reservoir namun tidak semua batupasir memiliki porositas yang baik. Sistematika pemercontohan singkapan Formasi Walat yang diyakini berpotensi sebagai batuan reservoar di analisis ke laboratorium untuk dilihat porositasnya. Sebanyak delapan percontoh terpilih dan dianalisis dengan metode petrografi untuk mengetahui jenis porositas serta menghitung nilai porositas batupasir Formasi Walat yang terletak di desa Cicantayan, Kecamatan Cisaat, Kabupaten Sukabumi. Berdasarkan hasil analisis petrografi semua percontoh batupasir di daerah penelitian memiliki porositas primer intergranular dan memiliki nilai porositas yang cukup hingga istimewa. Berdasarkan penelitian ini dapat dikatakan secara umum batupasir didaerah penelitian memiliki porositas yang sangat baik sehingga berpotensi menjadi batuan reservoir yang baik.Kata Kunci: Walat Formation, sandstone, porosity, petrographic analysis.
SEBARAN NANNOFOSIL PADA ANGGOTA BATUGAMPING FORMASI PAMUTUAN, PANGANDARAN, INDONESIA Rieuwpassa, Lilian Cornelia; Isnaniawardhani, Vijaya; Pratiwi, Santi Dwi; Nurdrajat, .; Gaspersz, Gabriela C. N.
Bulletin of Scientific Contribution Vol 19, No 2 (2021): Bulletins of Scientific Contribution : Geology
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v19i2.33292

Abstract

Pangandaran merupakan daerah yang terdiri dari karakteristik batugamping grainstone, packstone, wackestone dan batugamping kristalin. Studi ini dilakukan untuk mengetahui sebaran spesies calcareous nannofosilyang terdapat dalam satuan batugamping penyusun dari Anggota Batugamping Formasi Pamutuan. Penelitian yang dilakukan pada 2 (dua) titik lokasi measuring section diperoleh 40 lapisan batugamping pada Anggota Batugamping Formasi Pamutuan. Analisis sampel batugamping menggunakan metode suspensi dan dikeringkan dibawah UV light dan observasi preparate slide nannofosil di bawah mikroskop dengan perbesaran 1000x berdasarkan counting technique. Berdasarkan hasil identifikasi, didapatkan spesies nannofosil antara lain Catinaster coalithus, Calcidiscus macintyrei, Calcidiscus leptoporus, Coccolithus miopelagicus, Coccolithus sp., Cyclicargolithus floridanus, Discoaster quinqueramus, Discoaster sp., Hughesius sp., Helicosphaera carteri, Helicosphaera sp., Reticulofenestra spp. (2-3mm), Reticulofenestra spp. (3-4 mm), Reticulofenestra pseudoumbilicus, Sphenolithus abies Sphenolithus heteromorphus, Sphenolithus moriformis, Sphenolithus sp. dan Umbellosphaera irregularis. Selain itu, penelitian ini juga menyajikan catatan Sphenolithus yang memiliki kelimpahan sangat baik dan memiliki distribusi menerus yang tercatat dari umur Miosen Tengah hingga Miosen Akhir. Sphenolithus adalah salah satu spesies nannofosil yang penting untuk proxy pada kondisi oligotrofik yang mampu beradaptasi dengan peningkatan stratifikasi air laut.
Biostratigrafi Calcareous Nannofossil Miosen Pada Anggota Batugamping Formasi Pamutuan Pangandaran, Jawa Barat GASPERSZ, GABRIELA.C.N.; Isnaniawardhani, Vijaya; Pratiwi, Santi Dwi; Nurdrajat, .; Rieuwpassa, Lilian C
Bulletin of Scientific Contribution Vol 18, No 3 (2020): 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.v18i3.31478

Abstract

Lokasi penelitian terletak di Parakanmanggu, dan Cigugur, Pangandaran, Jawa Barat, Indonesia. Penelitian ini difokuskan pada korelasi biostratigrafi Anggota Batugamping Formasi Pamutuan dengan analisis detil pada singkapan satuan batugamping. Anggota Batugamping Formasi Pamutuan terendapkan pada umur Miosen Tengah hingga Miosen Akhir dengan lingkungan pengendapan laut. Metode penelitian meliputi observasi lapangan dengan menggunakan metode measuring section pada dua lintasan, preparasi nannofossils, dan analisis kualitatif. Empat puluh sampel batugamping yang terdiri dari batugamping kristalin, batugamping grainstone, dan batugamping packstone telah dianalisis dengan metode smear slide dan suspensi. Distribusi calcareous nannofossil menunjukkan pembentukan enam Zona: Sphenolithus heteromorphus dan Coccolithus miopelagicus (NN5); Cyclicargolithus floridanus (NN6); Catinaster coalithus (NN7); Discoaster berggrenii (NN8-NN9); Reticulofenestra small size (NN10-NN11); dan Discoaster quinqueramus (NN12). Berdasarkan distribusi kemunculan awal dan akhir dari nannofossils datum spesies, kami menyimpulkan bahwa Anggota Batugamping Formasi Pamutuan terendapkan pada rentang umur relatif NN5 sampai NN12 atau Miosen Tengah sampai Miosen Akhir.
KARAKTERISTIK BATUBARA REGRESI DAN TRANSGRESI FORMASI MUARA ENIM CEKUNGAN SUMATRA SELATAN Nurdrajat, Nurdrajat
Bulletin of Scientific Contribution Vol 16, No 3 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (895.446 KB) | DOI: 10.24198/bsc.v16i3.18772

Abstract

Formasi Muaraenim merupakan formasi pembawa-batubara yang tersebar meluas di Cekungan Sumatra Selatan. Penyebaran pola batubara pada daerah penelitian belum dapat dijelaskan dari sisi temporal dan spasialnya. Sehingga, status horison korelasi seam batubara masih bersifat parsial. Melalui konsep stratigrafi sikuen dengan metode sumur/log dan rekonstruksi paleogeografi, maka status kehadiran dan kompleksitas batubara pada daerah penelitian dapat dijelaskan secara komprehensif. Tujuh belas unit sikuen terbentuk dengan karakter tiap unit sikuen yang beragam. Unit sikuen tersebut terbagi kedalam sikuen regresi dan transgresi. Karakter batubara pada sikuen transgresi berbeda pada saat sikuen regresi. Karakter batubara dalam sikuen regresi memiliki pola ketebalan yang semakin menebal ke arah lapisan yang lebih muda (thickenning upward) dan sebaliknya, batubara dalam pola penipisan ketebalan (thinning upward) berada dalam unit sikuen transgresi. Konsep dan metode yang diterapkan ini mampu menjelaskan karakter fisik (spasial) serta waktu (temporal) dalam kerangka transgresi/regresi yang berkorespondensi terhadap fase genetik pembentukan batubara dalam tiap siklus pengendapan. Kata kunci: Seam Batubara, Formasi Muaraenim, stratigrafi sikuen, Temporal-Spasial.
Co-Authors Adi Hardiyono, Adi Adithya Ramadhani Hasibuan Adycipta Anis Prawoto, Adycipta Anis Arbi, Hafsanjani Asep Bahtiar Purnama, Asep Bahtiar Asmoro, Yoki Dwi Budi Muljana Catur Purwanto, Catur DEWI, VISKA TRIARAMINTA Dicky Muslim Djadjang Jedi Setiadi Edy Sunardi Fachrudin, Kurnia Arfiansyah Fathin, Muhammad Kayis Fenry Simorangkir, Fenry GANI, REZA MOHAMMAD GANJAR Gaspersz, Gabriela C. N. GASPERSZ, GABRIELA.C.N. Iyan Haryanto, Iyan Juniarto, Reinaldi Kurniawan, Endy M. Dwiki Satrio Manurung, Jekson Muhammad Kurniawan Alfadli Naufal, Muhammad Audy Reza Mohammad Ganjar Gani Rieuwpassa, Lilian C Rieuwpassa, Lilian Cornelia RIZKY, ALIF DILANDY Sendjaja, Yoga A. Silti Salinita, Silti Syaiful Alam Undang Mardiana Vijaya Isnaniawardhani Yusi Firmansyah, Yusi Yuyun Yuniardi