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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 6 Documents
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Search results for , issue "Vol 5 No 3 (2021): Bulletin of Geology" : 6 Documents clear
PALEOGEOGRAPHY RECONSTRUCTION OF PEMATANG GROUP IN NORTH AMAN TROUGH, CENTRAL SUMATRA BASIN Kirandra Ferari Budhi Prasojo
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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Abstract

Central Sumatra Basin is a proven prolific basin. Most of hydrocarbon accumulation are in post-rift interval of Sihapas Group, meanwhile the syn-rift interval of Pematang Group is still under-explored. Nevertheless, there are remaining risk and uncertainty of reservoir geometry and distribution in this interval. The previous study on Pematang Group were not utilizing 3D seismic with integration with well data to identify sandstone reservoir distribution in North Aman Trough. Paleogeography reconstruction of Pematang Group with integration of well and seismic data as in this study will be useful to reduce risk and increase chance to find new resources. Approximately 1,230 sq. km of 3D merged post-migrated seismic cube which were tied to 45 wells in North Aman Trough have been interpreted with tectonostratigraphic approach. Main structure on this area is a series of Northwest – Southeast normal fault that was developed during Eo-Oligocene. Those faults were inverted to thrust fault during Middle Miocene – recent. Paleogeography reconstruction were inferred from conventional core data, wireline log electro-facies, seismic geomorphology, isopach map as proxy of paleo-topography and rift tectonostratigraphy model. Biostratigraphy data suggests gradually changing on Eocene-Oligocene paleoenvironment from terrestrial to marine transition. However, foraminifera fossil had just occurred in Early Miocene as indication of marine incursion. Core data indicates lithofacies of sand flaser and mud lenticular which is associated to rapid changes of sedimentation flow due to rainfall rate or climate. Paleogeography of Pematang Group is influenced by three rift tectonic stages: 1) rift initiation, with environment of alluvial plain, alluvial fan and fluvial meander; 2) rift climax, with environment of deep lacustrine, shallow lacustrine, marginal lacustrine, nearshore lacustrine, deltaic, fluvial meander, alluvial plain and fan delta; 3) immediate post-rift, with environment of fluvial braided and alluvial plain. Key words: paleogeography, tectonostratigraphy, rift
PENGAYAAN TIMAH (Sn) DAN UNSUR TANAH JARANG (Ce, La, dan Y) ENDAPAN PLASER DI BADAU, KABUPATEN BELITUNG Yan Rizal
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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Abstract

Sari Penelitian dilakukan di dalam wilayah Kecamatan Badau, Kabupaten Belitung, Kepulauan Bangka Belitung, dengan tujuan untuk mengetahui daerah sebaran dan pengayaan timah dan unsur tanah jarang pada endapan plaser. Metode yang dilakukan pada penelitian ini antara lain pemetaan geologi, penyontohan batuan, dan penyontohan endapan plaser. Kandungan mineral pada conto endapan plaser diidentifikasi menggunakan metoda Grain Counting Analysis (GCA). Analisis geokimia conto dilakukan dengan menggunakan metoda X-Ray Fluorescence (XRF) untuk menentukan kandungan unsur Sn, Ce, La, dan Y. Untuk mendapatkan nilai anomali kandungan unsur dilakukan analisis univariat. Hasil analisis univariat kemudian dihubungkan dengan kondisi geologi daerah penelitian sehingga dapat ditentukan daerah pengayaan timah dan unsur tanah jarang dominan di bagian tengah daerah penelitian. Kandungan unsur Sn memiliki nilai kandungan dengan rentang yang sangat jauh 9,67 ppm – 82652 ppm, unsur Ce memiliki nilai kandungan dengan rentang 113,33 ppm – 3570 ppm, unsur La memiliki nilai kandungan dengan rentang 72,67 ppm – 1404,33 ppm, dan unsur Y memiliki nilai kandungan dengan rentang 6 ppm – 784,67 ppm. Abstract The research was conducted in the area of ​​Badau District, Belitung Regency, Bangka Belitung Islands, and the aim of the research is to understand the distribution area and enrichment of tin and rare earth elements in placer deposits. The methods used in this research include geological mapping, rock sampling, and placer sediment sampling. Mineral content in placer sediment samples was identified using the Grain Counting Analysis (GCA) method. Geochemical analysis of the samples was carried out using the X-Ray Fluorescence (XRF) method to determine the elemental content of Sn, Ce, La, and Y. Univariate analysis was performed to obtain the anomalous value of the elemental content. The results of the univariate analysis are then linked to the geological conditions of the study area so that the dominant tin and rare earth enrichment areas, in the middle of the study area, can be determined. The Sn has values with a very wide range of 9.67 ppm - 82652 ppm, the Ce values ranging from 113.33 ppm - 3570 ppm, La value ranging from 72.67 ppm - 1404.33 ppm , and Y has values ranging from 6 ppm - 784.67 ppm.
POTENSI PENGAYAAN TIMAH PRIMER DAN SEKUNDER SERTA UNSUR TANAH JARANG DI DAERAH SIMPANG PESAK, KABUPATEN BELITUNG TIMUR Yan Rizal
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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Abstract Enrichment studies for primary and secondary tin and rare earth elements were carried out in the Simpang Pesak area, East Belitung Regency which is located at the coordinates of UTM 823865 - 827977 mE and 9653722 - 9658725 mS. This study was conducted to determine potential areas for primary and secondary tin content and rare earths in plaser deposits and granite source rock. The analysis was carried out on primary data taken directly in the field, in the form of rock samples and plaser sediment samples. Plaser sample analysis was carried out on three grain size fractions, namely fraction # 48 (297-354 μm), fraction # 100 (149 μm) and fraction -100 (<149 μm). Geochemical analysis using X-Ray Fluorescence (XRF) Portable on rock samples and plaser sediment concentrates to be carried out the levels of lead and rare earth elements. Univariate statistical analysis was performed to determine the limit value of elemental anomalies. Grain Counting Analysis (GCA) was also carried out on samples of plaser sediment to see the minerals contained in these deposits. Rare earth elements found in the study area include yttrium, cerium, and lanthanum. High levels of lead are in the southern part and some in the middle of the study area. High grade rare earth elements are well known in the central part of the study area. Tin and rare earth anomalies are enriched in the morphology of river steps with ancient alluvial plaser types. The factors that influence the anomaly area are ordering process, source rock, and morphology. Further exploration started from the west to the southeast towards the north towards the granite hills in the study area.
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.
POTENSI GAS BIOGENIK DAN TERMOGENIK DI WILAYAH EKSPLORASI CEKUNGAN KUTAI BAGIAN SELATAN, LEPAS PANTAI KALIMANTAN TIMUR Yudhi Artha
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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Cekungan Kutai bagian selatan saat ini masih lebih sedikit dieksplorasi dibandingkan dengan wilayah Mahakam dan lainnya yang berada di bagian utara dari cekungan ini. Penelitian ini berfokus untuk mengetahui potensi batuan induk aktif yang dapat menghasilkan hidrokarbon dan besar volume yang dapat dihasilkan, serta migrasinya yang dapat mendorong kembali kegiatan eksplorasi pada wilayah ini. Metode dari penelitian ini melakukan evaluasi geokimia sebagai penapisan dari batuan induk yang berpotensi untuk menghasilkan hidrokarbon biogenik dan termogenik. Pirolisis Rock-Eval, analisis biomarker berupa gas kromatografi – spektrometri massa (GC-MS) yang dievaluasi dari sembilan sumur eksplorasi digunakan untuk menentukan kuantitas, kualitas, kematangan dan lingkungan pengendapan material organik. Pemodelan cekungan secara 1D dan 3D dengan menggunakan hasil evaluasi geokimia dan geologi, untuk menentukan adanya akumulasi dan jejak hidrokarbon termogenik di sekitar wilayah penelitian melalui analisis migrasi. Analisis isotop, gradien termal dan laju sedimentasi digunakan untuk menentukan lingkungan dan pola aktivitas mikroorganisme anaerob dalam pembentukan gas biogenik, serta analisis geofisika meliputi interpretasi dan pemetaan struktur bawah permukaan menggunakan seismik 2D dan 3D serta menentukan distribusi dari potensi batuan induk dan sejarah migrasinya. Data geokimia dan isotop menunjukkan bahwa gas biogenik terbentuk dari Miosen Akhir sampai sekarang, kuantitas material organik endapan dari yang sedang hingga baik sekali (0.51 - 7.31 % berat TOC) merepresentasikan aktivitas mikroorganisme dengan laju sedimentasi yang cukup tinggi rata-rata 6,2 x 107 ton/tahun. Gas termogenik, bagaimanapun diharapkan dari lapisan Oligosen Akhir hingga Miosen Awal dari sedimen setelah lisu disepanjang Cekungan Kutai.
ANALISIS TEKANAN LUAP DAN MEKANISME PEMBENTUKANNYA MENGGUNAKAN DATA SUMUR DAN KECEPATAN SEISMIK PADA LAPANGAN “SKW”, CEKUNGAN JAWA TIMUR UTARA FASIH KAZAINULLAH; Perdana Rakhmana Putra; Agus Mochamad Ramdhan
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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The drilling in the North East Java Basin, known as one of the prolific hydrocarbon basins in Indonesia, is often experiencing several problems due to the presence of overpressure. This study aims to predict overpressure and analyze the generating mechanism using well and seismic data in SKW field in the basin, so that overpressure-related drilling problems could be avoided. Based on pore pressure analysis, we found that there are 5 pressure zones in the study area, i.e: hydrostatic pressure in Zone A and C, occurring in Lidah to the upper of Mundu formation and Ledok Formation; first appearance (top) of overpressure at Zone B occurring in the middle to lower Mundu Formation; moderate overpressure in Zone D occurring in upper – middle Wonocolo Formation; high overpressure in Zone E occurring in middle Wonocolo – Ngrayong formations. Our analysis also shows that sediment thickness controls overpressure magnitude in the study area, indicating that overpressure is due to loading mechanism. The interpretation of loading mechanism as the main generating mechanism of overpressure in the study area is also supported by constant effective stress behaviour as observed in wells analysed in this paper. Burial history analysis also shows that rate of sedimentation in the study area is about 113 m/mY, in favour of supporting the loading mechanism interpretation. We also found that starting at the depth of 4000 ft, smectite starts to transform into illite, however, this transformation does not give substantial impact to overpressure magnitude in the study area.

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