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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 100 Documents
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LITHOFACIES, MINERALOGICAL, PETROPHYSICAL AND MECHANICAL PROPERTIES ANALYSIS OF RESERVOIR AND SEAL ROCKS FOR CARBON CAPTURE STORAGE (CCS) SYSTEM. PILOT STUDY IN GUNDIH FIELD, CENTRAL JAVA, INDONESIA. harya danio
Bulletin of Geology Vol 6 No 3 (2023): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Abstract

In the East Java Basin Indonesia, the Ngrayong Sandstone has been targeted as a reservoir for carbon capture and storage (CCS). In this CCS system, the limestone and mudstone of Bulu and Wonocolo Formation is expected to serve as the primary seal. The purpose of this study are to investigate the lithological, mineralogical, and mechanical and petrophysical properties of the Ngrayong, Bulu and Wonocolo Formations from surface lithology as an analogue study, and later will be adapted to subsurface injection well (Jepon-1) to characterize its potential as a functional reservoir and seal in a CCS system. Two Shallow core-drilling and outcrop sampling derived Ngrayong, Bulu and Wonocolo Formation samples are described using a combination of petrography, x-ray diffraction, petrophysical and mechanical properties analyses. These analysis show that the Ngrayong, Bulu and Wonocolo Formation contains seven different lithofacies (claystone with thin quartz sandstone, clean quartz sandstone, mudstone, bioclistic limestone, calcarenitic limestone, sandy marl, and grainstone) with fine-scale heterogeneities in fabric and mineralogy that greatly influence the petrophysical properties. Porosity, permeability, and other petrophysical properties suggest that have the capability to serve as a suitable CCS seal. Abundant authigenic minerals and dissolution textures indicate that multiple generations of past fluid-rock interactions have occurred within the Ngrayong, Bulu and Wonocolo Formation. Minerals that would be potentially reactive in a CCS system (including carbonate and chlorite) are common in the Ngrayong and Wonocolo Formation
STUDI TIPE BATUAN DAN PEMODELANNYA DI BLOK X, CEKUNGAN BARITO Zurisman Fitriadi; Dwiharso Nugroho; Nurcahyo Indro Basuki
Bulletin of Geology Vol 1 No 1 (2017): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2017.1.1.5

Abstract

Field X is an oilfield in Barito Basin, South Kalimantan, which produces hydrocarbon from reservoir within Lower Tanjung Formation. The oil discovery in this field was initiated in 1930 by BPM and until now Tanjung field is still productive and field development is ongoing. Layer D is in Lower Tanjung Formation and is believed as meandering channel depositional setting. Core and thin section data from Layer D could be found from well X-109, X-104, and X-105. Analysis which has been conducted finding 9 lithofacies’, including (1) siltstone-claystone (F), (2) rooted siltstone (Fr), (3) very fine sandstone (Svf), (4) fine sandstone (Sf), (5) bioturbated and rooted fine sandstone (Sfbr), (6) weakly cemented fine sandstone (Sfwc), (7) weakly cemented medium sandstone (Smwc), (8) moderately cemented medium sandstone (Smmc), and (9) coarse sandstone (Sc). These lithofacies’ are grouped into four architectural facies’ (1) channel sand, (2) point bar, (3) crevasse splay, dan (4) overbank. Rock type determination used flow zone indicator (FZI) method found 3 rock types (RT). RT 1 is associated to channel sand, RT 2 is associated to channel body, point bar, and overbank, and RT 3 is associated to channel sand, point bar, crevasse splay, and overbank. Reservoir properties modelling which is controlled by facies and rock type models showed relation in petrophysical behaviour to its rock type. High porosity values are associated to channel sand. High permeability values are associated to rock type RT 1 and RT 2.
VOLCANOSTRATIGRAPHY IN THE LOKON VOLCANO AREA AND ITS SURROUNDINGS, NORTH SULAWESI Kevin Gerald Senduk; Mirzam Abdurrachman
Bulletin of Geology Vol 7 No 2 (2023): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Abstract

Lokon Volcano is an active Quaternary volcano located in the Celebes - Sangihe Volcanic Arc. This study was conducted to explain the stratigraphy of volcanic rocks based on geomorphological analysis and petrological characteristics. Based on the geomorphological analysis, the Lokon Volcano area is divided into 9 geomorphological domains (Kayawu, Woloan, Kamasi, Irang, Lokon, Tatawiran, Galean, Kinilow, and Empung) separation is carried out based on topographic straightness patterns, reliefs, and topographic distribution patterns. Based on the field description, the rock unit is divided into 18 geological units in the form of lava flows, pyroclastic flows, pyroclastic falls, and mudflows. Volcanology units of Lokon Volcano and its surroundings according to ISC (Indonesian Stratigraphic Code) are classified into Crown Tatawiran, Crown Kinilow, Crown Empung, and Crown Tou Lokon. Crown Kinilow is dominated by pyroclastic deposits with a scorious textured basalt composition, while Crown Empung is dominated by basalt lava flows. Crown Tou Lokon consists of 3 hummocks, namely Lokon which is dominated by pyroclastic flows, Irang which is dominated by lava flows with holohyalin textures, and Tompuluan which is dominated by pyroclastic falls. Lokon Mountain volcanic facies are divided into Tatawiran Proximal Facies, Kinilow Central Facies, Kinilow Proximal Facies, Kinilow Medial Facies, Empung Central Facies, Empung Proximal Facies, Lokon Central Facies, Lokon Proximal Facies, Lokon Medial Facies, Irang Central Facies, Irang Proximal Facies, Tompuluan Central Facies, and Tompuluan Proximal Facies.
ANALISIS KETAHANAN (DURABILITY) BATULEMPUNG FORMASI SUBANG DI DAERAH UJUNGJAYA DAN SEKITARNYA, KABUPATEN SUMEDANG, JAWA BARAT Misbahudin Misbahudin; Imam Achmad Sadisun
Bulletin of Geology Vol 2 No 1 (2018): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2018.2.1.3

Abstract

Saat ini pembangunan skala besar sedang direncanakan di sekitar wilayah Sumedang, Jawa Barat yang meliputi pembangunan Bandara Internasional Kertajati, Jalan Tol Cisumdawu, Sentra Industri Ujungjaya, dan Bendungan Cipanas. Aktivitas pembangunan tersebut dapat terkendala permasalahan geologi teknik karena berada di atas batulempung Formasi Subang. Batulempung jenis ini diketahui memiliki pengaruh signifikan dalam aktivitas rekayasa karena sifatnya yang mudah hancur (slaking) ketika mengalami kontak dengan udara dan/ atau air. Tujuan dari penelitian ini adalah untuk mengetahui karakteristik ketahanan (durability) batulempung Formasi Subang di Daerah Ujungjaya, Kabupaten Sumedang. Penelitian dilakukan melalui observasi lapangan dan pengambilan sampel batulempung segar dalam bentuk sampel tak terganggu. Selanjutnya sampel dibawa ke laboratorium dan dilakukan pengujian slake durability serta analisis mineral lempung melalui uji difraksi sinar X. Dari hasil pengujian tersebut, batulempung Formasi Subang di daerah penelitian memiliki ketahanan rendah. Kandungan mineral monmorilonit dan pirit yang ditemukan pada sampel batulempung Formasi Subang menjadi faktor penyebab rendahnya nilai ketahanan batuan tersebut.
The Evaluation of Trial Grouting on the Foundation Ladongi Maindam, East Kolaka Kukuh Vivian Tri Adhitama
Bulletin of Geology Vol 5 No 4 (2021): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Abstract

Grouting (pressurized cement mixture injection) is a frequently used method of repairing the foundation of the main dam. The quality of rock mass is influenced by rock anisotropy conditions, the presence of discontinuities is the main factor that causes permeability, strength, and dynamic rock properties at each location point vertically or laterally. Ladongi Dam is a dam with an embankment type, on the foundation of the main dam is the part that holds the greatest load and also anticipates subsurface flow/seepage, so it is necessary to repair the rock mass on the foundation to increase the strength of the rock mass, and reduce permeability value. 112 lugeon tests were carried out in multiple down stages with a total drilling depth of 560 meters. The spacing and the use of maximum pressure at the time of injection cement are evaluated in this experiment regarding effectiveness and response of rocks to hydraulic fracture and permeability. The test results show that the pattern and pressure applied have been effective for the left abutment and river-bed of the main dam based on all depths in CH-01 and CH-02 that do not require grouting, in contrast to right abutment which still requires grouting in the third and fourth stage CH-03 holes. The left and right abutment show poor conditions at a depth between 10 and 30 meters with a large cement injection volume up to 2000 kg in one stage. The use of many variations of the mixture in the cement mixture injection process indicates a turbulent flow pattern as in the fourth stage of P.RMD 17A. Implementation of grouting can change the natural/initial flow pattern, as in right abutment on the CH-03 almost all flow pattern all stages change to the dilatation pattern based on the relationship of pilot hole and check hole.
POTENSI GAS SERPIH FORMASI PULOBALANG, CEKUNGAN KUTAI, KALIMANTAN TIMUR Ahmad Hamdani; Dardji Noeradi; Yusup Iskandar
Bulletin of Geology Vol 3 No 2 (2019): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2019.3.2.5

Abstract

Kutai Basin has proven to be a productive basin and has great potential, this fact indicating the existing petroleum system has been running well. Therefore, more specific investigations need to be carried out, especially for development of non-conventional hydrocarbon reserves, and find out in detail the characteristics of rocks that have potential to be carriers of potential shale gas in the Kutai Basin. The used data in this study included 5 (five) drilling wells, Ramin-1, Rasamala-1, Buat-1, Busang-1, and Murung-1 which contained wireline log data, mud logs, biostratigraphic analysis, geochemical analysis, and 81 line 2-D seismik trajectories. Further interpretation using geochemical data and modelling with Passey Method. In geomechanical data analysis, modeling used wireline logs, produce Young modulus values, Poisson ratios, and rock brittleness. Petrophysical analysis was used to be a parameter of rock quality. These data are depicted vertically and horizontally with seismic data benchmark, resulting in facies distribution and rock quality parameters as shale gas reservoirs. The research showed that Pulobalang Formation in the study area, deposited in the deltaic to slope environment, with type III kerogen, TOC content level poor until excellent with 0.12 - 7% value and brittleness value 0.05-0.971. The calculation was conducted based standard criteria as shale gas reservoir. Total potential of shale gas resources in the Pulobalang Formation reaches 2.78 TCF.
LIQUEFACTION POTENTIAL ANALYSIS IN TRANS – SULAWESI RAILWAY, POLEWALI MANDAR-MAJENE SEGMENT USING CONE PENETRATION TEST METHOD Dzikra Zhafira; Imam Achmad Sadisun
Bulletin of Geology Vol 6 No 2 (2022): Bulletin of Geology Special Issue: International Seminar on Earth Sciences and Te
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Abstract

rans-Sulawesi Railway is the first railway in Sulawesi. One of the segments that is passed by this railway is Polewali Mandar-Majene segment, West Sulawesi, which became the research area. The research area mostly contains of Quaternary sediments such as alluvial. Liquefaction may occur because of earthquake that causes loss of strength within soils. Most of the cases, liquefaction occur in Quaternary sediments that are decomposed, loose, and unconsolidated. So, liquefaction analysis is needed on the research area to determine the liquefaction potential that might happen there. Liquefaction potential analysis was carried out using cone penetration test method (CPT). The analysis conducted is liquefaction trigger analysis. The analysis was carried out by calculating liquefaction safety factor (FSL) and liquefaction potential index (LPI) at 14 CPT sites with varying depth from 3,8 meters – 14 meters. Based on the analysis, the liquefaction safety factor (FSL) value obtained shown that the 14 CPT sites has a potential for liquefaction with Mw 7,5 earthquake because the FSL values are less than 1. Based on the calculation of liquefaction potential index (LPI), the research area is in the high – highest category.
TEKTONOSTRATIGRAFI DAN SIKUEN STRATIGRAFI ENDAPAN LISU BLOK DUYUNG, CEKUNGAN NATUNA BARAT Ariyani Rachmad; Djuhaeni Djuhaeni; Prihadi Sumintadireja
Bulletin of Geology Vol 1 No 2 (2017): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2017.1.2.3

Abstract

Duyung Block is located in the Natuna Sea and geologically is the part of West Natuna Basin. The area of research is the 3D seismic area, part of Duyung Block, covering approximately 412 square kilometers. This study aims to determine the stratigraphy of syn-rift deposition in Duyung Block to understand the distribution and seismic facies at the depth interval of syn-rift. Seismic facies map is generated based on seismic geomorphology analysis using stratal slice method with displaying CWT (Continuous Wavelet Transform) seismic attribute. Based on lithostratigraphy correlation and the information from AA-1X and Forel-2 wells, syn-rift sediment were deposited within a supratidal, fresh water, predominantly lacustrine. The analysis of seismic geomorphology with stratal slices in the area of research encountered three depositional systems in the area of syn-rift, i.e., fluvial deltaic, shallow lacustrine and deep lacustrine. Rift depositional system in the study area can be divided into four tectonostratigraphy phases, i.e., Early Rift, Middle Rift, Late Rift and Early Post-rift. The boundary between tectonostratigraphy phases is determined from the analysis of seismic expression. Based on the analysis of seismic-sequence stratigraphy, syn-rift depositional system can be divided into 3 sequence packages, i.e., Sequence-1 (interval SB0-SB1), Sequence-2 (interval SB1-SB2) and Sequence-3 (interval SB2-SB3). Generally in the area of research, the tectonostratigraphy boundaries are relatively coincide with the sequence boundaries, but toward bonding fault-rift, the difference between those two are increasingly visible.
ANALISIS MORFOTEKTONIK DAS GRINDULU DI DAERAH PACITAN DAN SEKITARNYA, KABUPATEN PACITAN, JAWA TIMUR arif hanif hidayat
Bulletin of Geology Vol 5 No 3 (2021): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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MORPHOTECTONIC ANALYSIS OF GRINDULU WATERSHED IN PACITAN AND SURROUNDINGS, PACITAN DISTRICT, EAST JAVA. Tectonic geomorphology is the main factor that controls the development of land forms in active tectonic areas and has a significant influence on river systems and mountainous landforms. This tectonic geomorphological research focuses on the Grindulu River Basin (DAS) in Pacitan and its surroundings, dividing it into 10 sub-watersheds. The Grindulu watershed is administratively located in three regions, namely Pacitan Regency, Ponorogo Regency and Wonogiri Regency with an area of ​​674.90 km². Covering an area of ​​612.36 Km² or 90.6% of this watershed, it is included in the administrative area of ​​Pacitan Regency, which is spread across several districts. In the Grindulu watershed there are several large faults including the Grindulu Fault, the Kayuwayang Fault, the Karangrejo Fault and the Tegalombo Fault. The Grindulu fault is a fault that is thought to be active so that it is the basis of this study. The movement of faults in the Grindulu watershed is dominated by faults trending southwest-northeast. The purpose of this study is to determine and analyze the tectonic geomorphology of the Grindulu watershed, in the form of geomorphological, morphometric, and seismic history analyzes. The study area and its surroundings are part of the eastern Southern Mountain Zone which lies in the transitional zone between Cretaceous subduction and Tertiary period subduction. Geographically, the research area is located between 07˚ 55 '10' 'LS - 08˚ 17' 30 '' LS and 110˚ 55 '10' 'BT - 111˚ 25 "10" BT. One method to identify the level of activity of the Grindulu watershed is to use a tectonic geomorphological approach through quantitative morphometric parameters. Quantitative morphometric analysis is used to identify the Relative Tectonic Activity Index (IATR), namely, knickpoint, river length gradient index (SL), watershed asymmetry (AF), integral hipsometry and curve hipsometry (HI), valley-to-valley floor width ratio (Vf ), and the form of the watershed (Bs). All parameters are combined with geological data including rock distribution, topography, and geological structures in the study area, as well as historical seismic data to produce a quantitative map of relative tectonic activity in the Grindulu watershed. Based on the results of the relative tectonic activity in the Grindulu watershed, the research area can be divided into three classes; high tectonic activity class, medium tectonic activity class, and low tectonic activity class. Based on the results of the IATR value analysis, the Grindulu watershed which has high tectonic activity are Sub-DAS 2, 7, and 10, occupying 33.57% of the research area, for moderate tectonic activity are Sub-DAS 1, 3, 5, 8, and 9 occupied 49.28% in the study area, while for low tectonic activity were Sub-DAS 4 and 6, occupying 17.16% in the study area. Based on the results of this study in general, it can be concluded that the Grindulu watershed has a relatively medium-high tectonic activity index, so it is hoped that this result can be a basis for consideration of the development of the Pacitan and surrounding areas. Keywords: Watershed, Grindulu, tectonic geomorphology, morphometry, Pacitan.
IDENTIFY THE PATTERN OF URBAN GROWTH IN BANDUNG CITY USING GEOSPATIAL ANALYSIS Dwiputra Sam
Bulletin of Geology Vol 8 No 1 (2024): Bulletin of Geology Vol. 8 no. 1
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Abstract

Abstract. Land-use changes essentially are a side-effect of the growth of a city, which is commonly caused by urban developments. The spreading of urban developments on undeveloped land near a city (Urban Sprawl) may lead to a lack of urban planning, a lack of proper laws that regulate urban planning, and many other issues. To mitigate urban sprawl, the current study aims to determine the pattern of Bandung City's growth. The study focuses on the urban developments, that may have caused urban sprawl. The usage of time-series spatial data in an urban development analysis is typically used as the backbone of the study. Therefore, a 30 year dataset (1988-2018) is used to determine the pattern. The mean spatial method has been used to evaluate the dataset in Bandung City and the districts around the city. The method resulted in a pattern of movement resulting into the southwestern part of the city. Two points are also used to act as a pivot to determine the direction of the city's growth. The geometrical center of the study area and Gedung Sate were chosen as the pivot points. The direction of Bandung City’s growth based on the two pivot points resulted in the Southwest direction.

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