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Bulletin of Geology
Published by Institut Teknologi Bandung
ISSN : 25800752     EISSN : 25800752     DOI : 10.5614/bull.geol.
Core Subject : Science, Engineering,
Earth & Planetary Sciences Energy Engineering
Bulletin of Geology is a research-based periodical scientific open access journal published by Faculty of Earth Sciences and Technology, Institut Teknologi Bandung (ITB). The published article in Bulletin of Geology covers all geoscience and technology fields including Geology, Geophysics, Geodesy, Meteorology, Oceanography, Petroleum, Mining, and Geography. The submitted abstract must be written in English and Bahasa Indonesia, but the article content is English or Bahasa Indonesia.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi
Articles 7 Documents
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Search results for , issue "Vol 5 No 2 (2021): Bulletin of Geology" : 7 Documents clear
ANALISIS PERUBAHAN SUHU PERMUKAAN LAUT DAN IDENTIFIKASI UPWELLING BERDASARKAN FORAMINIFERA PLANKTONIK SEJAK AKHIR LAST GLACIAL MAXIMUM DI WILAYAH PERAIRAN PULAU SIMEULUE, ACEH Winda Eka Mandiri Puteri; KHOIRIL ANWAR MARYUNANI; PURNA SULASTYA PUTRA; SEPTRIONO HARI NUGROHO
Bulletin of Geology Vol 5 No 2 (2021): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Sari – Analisis perubahan iklim dan lautan di wilayah perairan Pulau Simeulue Aceh sejak Pleistosen Akhir hingga Resen dilakukan karena daerah ini berada di wilayah tropis Samudera Hindia yang memiliki peran dalam dinamika iklim global. Wilayah perairan barat Sumatera terletak di timur Samudera Hindia yang dipengaruhi oleh variabilitas atmosfer dan lautan sepanjang tahun. Penelitian ini dilakukan untuk mengetahui perubahan suhu permukaan laut (SPL) dan mengidentifikasi upwelling dengan menggunakan proksi foraminifera. Penelitian dilakukan dengan menggunakan sampel inti sedimen EW17-08 sepanjang 217 cm yang diambil dari kedalaman 2.811 m di perairan barat Pulau Simeulue Aceh pada posisi 94° 46’ 43” BT dan 2° 29’ 47” LU. Berdasarkan hasil pentarikhan AMS C-14 umur inti sedimen laut dalam EW17-08 adalah 21.300 BP (Plesitosen Akhir). Berdasarkan hasil analisis SPL menggunakan metode Modern Analogue Technique (MAT), rata-rata SPL pada Pleistosen Akhir adalah 27.78oC dan pada Holosen rata-rata SPL adalah 28.15oC. Perbedaan SPL pada Pleistosen Akhir-Holosen di daerah penelitian tidak terlalu signifikan namun terjadi beberapa kali penurunan suhu permukaan laut secara cepat yang diasosiasikan dengan peristiwa-peristiwa iklim yang terjadi sejak Last Glacial Maximum (LGM) seperti deglasiasi, Oldest Dryas, Bølling Interstadial, Older Dryas, Allerød Interstadial, dan Younger Dryas, Preboreal-Boreal, 8.2k event, Holocene Thermal Maximum, and 4.2k event, Subboreal, Warm Period, dan Little Ice Age. Intensitas upwelling di daerah penelitian menunjukan peningkatan pada Pleistosen Akhir yaitu pada kisaran umur 9.220-15.140 BP berdasarkan kelimpahan Globigerina bulloides. Upwelling yang terjadi pada periode tersebut mempengaruhi peningkatan total kelimpahan foraminifera yang cukup signifikan. Intensitas upwelling diperkirakan dipengaruhi oleh peningkatan intensitas muson tenggara. Kata Kunci: foraminifera, SPL, upwelling, perairan Pulau Simeulue Aceh, Indian Ocean Abstract –Analysis of climate change and oceanography in Simeulue waters, Aceh since the Late Pleistocene-Holocene were researched because this study area is located in the tropical Indian Ocean which plays a role in the dynamics of the global climate change. The study area is on the eastern Indian Ocean which is affected by the variability of the atmosphere and oceans throughout the year. This study aims to determine changes in sea surface temperature (SST) and identify upwelling using foraminifera proxy. A marine sediment core EW17-08 along 217 cm (94° 46’ 43” longitude and 2° 29’ 47” latitude) was retrieved from a depth of 2.811 m in western of Simeulue Island, Aceh. Based on AMS radiocarbon dating, the age of sediment core EW17-08 is 21.300 BP (Late Pleistocene). Based on SST analysis using Modern Analogue Technique (MAT) method, average of SST in the Late Pleistocene was 27.78oC and average of SST in the Holocene was 28.15oC. The difference in the Late Pleistocene-Holocene is not too significant but there have been several times abrupt decreasing SST in the study area which is associated with climatic event since Last Glacial Maximum (LGM) such as deglaciation, Oldest Dryas, Bølling Interstadial, Older Dryas, Allerød Interstadial, dan Younger Dryas, Preboreal-Boreal, 8.2k event, Holocene Thermal Maximum, and 4.2k event, Subboreal, Warm Period, and Little Ice Age. The intensity of upwelling showed increasing in the Late Pleistocene (9.220-15.140 BP) based on abundance of Globigerina bulloides. Upwelling that occurred during this period affected a significant increase in the total abundance of foraminifera. The upwelling intensity is estimated to be influenced by the increasing intensity of the southeast monsoon. Keywords: foraminifera, SST, upwelling, waters of Simeulue Island, Aceh, Indian Ocean
STRUCUTURAL AND GEOMECHANICAL ANALYSIS TO PREDICT NATURALLY FRACTURE CARBONATE RESERVOIR CAHARACTERIZATION OF WHF FIELD, BANGGAI BASIN, INDONESIA Reza Armanda; Indra Gunawan
Bulletin of Geology Vol 5 No 2 (2021): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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The WFH field has been in production since 2005 with reserves of 120 MMBO and has reached peak production of up to 4000 BOPD. The reservoir rock from this field is Miocene Bioclastic Limestone with an average matrix porosity of 8% and a water saturation of 13%. Based on the results of the core rock study and analysis of well production tests, the reservoir in the WFH field indicates the presence of natural fractures that control porosity and permeability so that a mechanical approach such as strutural and geomechanical analysis is needed to get an understanding of characteristics and distribution of natural fractures that the resolution is under seismic resolution. Geological structure parameters are obtained from the sesimic interpretation of reservoir horizon and several faults then reconstructed to obtain the strain value from this field. Geomechanical properties such as the stress regime in the WFH field are obtained from the results of stress analysis. The stress analysis shows that the WFH field is in a normal fault regime (Sv> SHmax> Shmin). Structural reconstrution analysis showed a vertical strain value is 18% and horizontal strain value is -17%. This value is obtained from the sum of the movement of reservoir in the thrust fault plane. The slope modeling of the simulated fracture ranges from 35 to 40 degrees which is identical to the natural fracture observations obtained from the log image interpretation. The intensity of fractures in the WFH field reservoir is in the area around the fault plane, especially in the bend area. In addition, the intensity of fractures that could potentially open is indicated by a large Slip Tendency value of 0.4. The incorporation of areas with high slip tendcy and fracture instensity resulted in an open natural fracture zone in this reservoir trending NW-SE which is associated with factoring faults that are identical to the trend of the WFH field structure.Modeling from this subsurface data is expected to be able to build a reliable geological and geomechanical structure model to provide the best recommendations of characteristic of natural reservoir fracture for the placement of further wells and as an analogy in reducing the risk of exploration in a similar play.
GEOLOGI BATUBARA DAERAH TANJUNG ENIM, KABUPATEN MUARA ENIM, PROVINSI SUMATERA SELATAN Yan Rizal
Bulletin of Geology Vol 5 No 2 (2021): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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This paper is based on research results to obtain an overview of the geology of the Tanjung Enim area and its coal potential. Data processing was performed using Minescape 5.7 software. The research was conducted in an area of ​​52.8 km2. The rock units found can be divided into six rock units, namely the Sandstone Unit, the Claystone Unit including the seven main coal seams in it (coal seams A1, A2, B, B1, B2, C, D), Sandstone Unit - Siltstone including four hanging coal seams. . Sandstone Unit - Tuff, Andesite Intrusion Unit, and Alluvial Deposits Unit. The Claystone Unit and Sandstone Unit - Batulanau are equivalent to the Muaraenim Formation, which is a coal-bearing formation in the study area. The results of the calculation of coal resources are based on surface mapping data and supported by 27 drill well data belonging to PT. Bukit Asam, Tbk., It was found that the hanging coal seam resource content was 25,570,170 tons and the main coal seam was 1,275,631,640 tons.The coal quality rating in the hanging coal seam is Subbituminous B Coal, A1 coal seam is Subbituminous A Coal while the A2, B, B1, B2, and C coal seam ratings are High volatile C Bitumious.
Studi Fasies dan Elemen Arsitektur Formasi Ranggam Di Daerah Belo Laut, Kabupaten Bangka Barat Yan Rizal; Elvira Risyeu Nur Annisa
Bulletin of Geology Vol 5 No 2 (2021): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Abstrak Pulau Bangka merupakan salah satu daerah dengan potensi timah dan mineral ikutan timah yang besar. Potensi timah danmineral ikutan timah dijumpai sebagai endapan primer dan endapan plaser. Endapan plaser di pulau Bangka dikelompokkan sebagai endapan undak sungai Purba dan Formasi Ranggam. Formasi Ranggam merupakan endapan sedimen sungai yang berumur Tersier. Formasi Ranggam tersusun atas 9 litofasies, yaitu Fasies Konglomerat Pasiran (SG), Batupasir Halus (FS),Batupasir Konglomeratan (GS), Batulanau Tufan (TSL), Batupasir Silang-siur Planar (S-p), Batupasir Konglomeratan Gradasi Terbalik (SG-i), Batulempung (CL), Batulempung – Batupasir (CLS), Batupasir Tufan (TS). Berdasarkan pada Elemenarsitekturnya Formasi Ranggam diendapkan dalam lingkungan sungai sebagai endapan channel fill, floodplain, natural levee,dan crevasse splay. Kata kunci: Bangka, Formasi Ranggam, Litofasies, Elemen Arsitektur Abstract Bangka Island is one of the areas with a large potential for tin and tin associated minerals. The potential for tin and lead associated minerals is found as primary deposits and plaser deposits. Plaser deposits on the island of Bangka are grouped as deposits of the ancient river steps and the Ranggam Formation. The Ranggam Formation is a Tertiary river sediment deposit. The Ranggam Formation is composed of 9 lithofacies, namely the Facies of the Pasiran Conglomerate (SG), Fine Sandstone (FS), Conglomerate Sandstone (GS), Tufan Silicate Sandstone (TSL), Planar Cross-sectional Sandstone (Sp), Reverse Gradation Conglomerate Sandstone (SG-i ), Claystone (CL), Claystone - Sandstone (CLS), Tuffan Sandstone (TS). Based on its architectural elements, the Ranggam Formation is deposited in a river environment as channel fill, floodplain, natural levee, and crevasse splay deposits. Keywords: Bangka, Ranggam Formation, Litofasies, Architectural Elements
ANALISIS PERUBAHAN GARIS PANTAI AKIBAT PEMBANGUNAN JETTY DI WILAYAH PANTAI KARANGSONG, INDRAMAYU, INDONESIA Umar Abdurrahman; Nining Sari Ningsih; Totok Suprijo; Ayi Tarya
Bulletin of Geology Vol 5 No 2 (2021): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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A jetty at the river downstream area of the Prajagumiwang River, Karangsong Beach, Indramayu, West Java Province, Indonesia was constructed in 2005. The aim of the jetty construction is to prevent channel siltation as the shipping lanes in that region. The construction of the jetty has an impact on local fishing activities and shoreline change at Karangsong Beach. Satellite image data from Google Earth in 2001, 2008, 2009, 2013, 2014, 2015, 2016, 2017, and 2018 were used to calculate coastal area change and coastline change. The high water line is selected as a proxy for shoreline position to reduce the error related to tidal range in manual digitization. The results of the analysis qualitatively and quantitatively, shoreline changes which were previously dominated by erosion became dominated by accretion after jetty construction. The largest total coastal area and total shoreline change occurred between 2001 and 2008 with the values are 297,136 m2 and 13,897 m respectively. In the period between 2008 and 2009 coastal area changes and shoreline changes showing fluctuation value which decreases over time indicate coastal natural processes to reach the equilibrium condition after the construction of the jetty.
RESERVOIR CHARACTERIZATION AND COMPARTMENT IN POSTRIFT DEPOSITED, UPPER TALANGAKAR FORMATION, BELUT FIELD, SOUTH SUMATRA BASIN Dimas Pramudito; Dwiharso Nugroho; Mirzam Abdurrachman
Bulletin of Geology Vol 5 No 2 (2021): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Belut field is one of Pertamina EP assets which has been in production for more than 50 years. This field is located about 120 km west of Palembang City, South Sumatra. The main reservoir is sandstone and limestone which was deposited at the beginning of the Miocene and is included in the upper part of the Talangakar or Transgressive Member (TRM) group. The discovery of hydrocarbons in a more down flank (north) area originated from step out drilling in the study area. Based on the drilling, oil is obtained from the sandstone reservoir with a greater pressure than in the existing area. Currently, Belut area is already in the development stage, so a more comprehensive reservoir model is needed for further development strategies. The data used in this study are core rock data from three wells, wireline data from 47 wells, fossil analysis, borehole images, and three-dimensional seismic data (3D Karbela) as well as reservoir pressure data. The first stage of the research was to determine lithofacies and facies associations from core rock data and biostratigraphy. Furthermore, determine parasequence marker ce and sequence by the electrofacies pattern for each well. Sequence stratigraphic correlation was performed to determine the distribution pattern of depositional facies. Reservoir characterization in three dimensions was carried out by modeling facies, shale volume, porosity, permeability, rock type, and saturation. Based on the correlation of sequence stratigraphy and seismic stratigraphy, the lateral distribution of the facies indicates a southward basinward direction. In this study, the southern area will be dominated by distal or marine deposits. On the other hand, the further north, terrestrial deposits will be found which are more sand prone in nature. An increasing in sea level during filling of basins (retrogradational) causes changes in facies vertically, hence it made channel, delta, to shallow marine deposition systems. The pressure data shows the northern part (after datum) has a pressure of 0.85 - 0.99 (SG equivalent) while the existing area has a pressure of 0.67 - 0.78 (SG equivalent). The difference in pressure is due to differences in genetic facies in the same sequence between the northern and southern areas. Based on the analysis of formation pressure and the discovery of hydrocarbon potentials in the down flank area, it shows that there is a compartment between the north and south areas (stratigraphic trap).
ANALISIS SESAR TUMBUH PADA SISTEM TEKTONIK DELTA TERSIER DI SUBCEKUNGAN TARAKAN, KALIMANTAN UTARA Hade Bakda Maulin
Bulletin of Geology Vol 5 No 2 (2021): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Subcekungan Tarakan sangat menarik namun kurang dieksplorasi. Di sebelah utara, subcekungan ini dibatasi oleh Sesar Sampoerna dan di selatan dibatasi oleh Sesar Mangkalihat. Kedua patahan regional tersebut merupakan patahan geser mengiri yang menghasilkan pengaturan unik terhadap proses sedimentasi delta dan proses deformasi yang terjadi di daerah tersebut. Struktur geologi yang berkembang di Subcekungan Tarakan berorientasi relatif timurlaut-baratdaya dengan jenis sesar normal di bagian ekstensi atau proximal secara pengendapan delta dan sesar anjak (toe-thrust) di bagian kontraksi atau distal. Kesejajaran pola antara sesar normal dan sesar anjak dalam suatu area yang sama kerapkali menimbulkan kesalahtafsiran bagi para explorationist yang bekerja di area ini. Analisis struktur geologi berupa analisis deskriptif, kinematik dan dinamik dilakukan untuk mengetahui proses deformasi pada area ekstensi dengan mempertimbangkan proses sedimentasi Delta Tarakan. Pengukuran laju sedimentasi terhadap besaran throw dari masing-masing sesar normal dilakukan untuk mendapatkan Expansion Index (EI) sebagai gambaran terjadinya sesar tumbuh. Selanjutnya evaluasi terhadap sesar tumbuh dilakukan dengan restorasi penampang untuk mengetahui proses deformasi yang terjadi berupa strain dan adanya kemungkinan lain selain pergerakan normal yang diisi sedimen delta. Deformasi yang terjadi di area penelitian dapat dikenali sebagai tektonik delta yaitu proses sedimentasi yang menghasilkan kontrol gravitasi terhadap deformasi batuan. Berdasarkan analisis yang dilakukan, sesar-sesar normal yang berada di area ekstensi merupakan sesar tumbuh dengan indeks pertumbuhan (EI) yang bervariasi terhadap umur batuan dan lokasi sesarnya. Hasil analisis terhadap beberapa sesar tumbuh menunjukkan indeks pertumbuhan sesar bervariasi terhadap throw dan laju sedimentasi pada downthrown-nya. Indeks pertumbuhan yang tidak sempurna diamati pada sesar-sesar yang terletak di bagian barat area penelitian, diduga terpengaruh aktifitas pengangkatan struktur pada Pliosen sehingga mengerosi sebagian besar sedimen sesar tumbuh. Adanya pergerakan aktif Sesar Sampoerna dan Sesar Maratua memberi pengaruh terhadap konfigurasi tektonik delta (gravity induce tectonic) berupa inversi sesar tumbuh yang sekaligus membentuk closure bagi pemerangkapan hidrokarbon. Kata kunci: Makalah, Cekungan Tarakan, tektonika delta, toe-thrust folds, sesar tumbuh, inversion

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