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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 112 Documents
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KARAKTERISTIK REKAHAN ALAMI, STUDI KASUS MODEL SINGKAPAN DIGITAL (DOM) BATUAN GRANITIK DI MUARO SILOKEK, SUMATERA BARAT Koesmawardani, Wildan Tri; Nurshal, M.E. Marshal; Sapiie, Benyamin; Rudyawan, Alfend
Bulletin of Geology Vol 3 No 3 (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.2019.3.3.1

Abstract

Digital Outcrop Model (DOM) is a method of building a more realistic, 3D-based geocellular model based on photogrammetric data. DOM can describe position of fractures with a minimum length of four meters, so it can describe better distribution and fracture geometry with more precision. DOM used has a dimension of 320 m × 12 m at fractured granitic rock outcrops at Muaro Silokek, West Sumatra. There are 1183 fracture interpretations in the DOM. Based on the fracture orientation scattered in the DOM, there are four segmentation structures with three domain orientation directions, north north west - south southeast (NNE-SSW), northeast - southwest (NE-SW), and east-northeast - west southwest (ENE-WSW). The results of kinematic analysis of the structural data show that the Muaro Silokek area is affected by the strike slip fault with the northwest-southeast direction (NW_SE) which is parallel with orientation of the Takung Fault. Fracture density analysis in DOM was carried out by grid method with grid dimensions of 20 m × 20 m resulting in a value range of 0.15 - 1 fracture/m2. From the results of the fracture density analysis, the kinematic analysis can be carried out to determine the minor fault orientation. Fracture density is strongly influenced by the distance to fault and has logarithmic distribution data with a high correlation coefficient R2 = 0.98.
GEOLOGI DAN ANALISIS GEOMEKANIKA TERHADAP OPTIMISASI INJEKSI AIR PADA LAPANGAN "SARINA" CEKUNGAN SUMATRA TENGAH, INDONESIA Rozamuri, Muhammad Fadli
Bulletin of Geology Vol 6 No 3 (2023): 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.2022.6.3.2

Abstract

Lapangan Sarina merupakan salah satu lapangan tua yang sebagian besar reservoir utamanya pada Formasi Bekasap, Formasi Bangko, dan Formasi Menggala, yang melampar secara horizontal dan menunjukkan adanya penurunan tekanan akibat lamanya produksi. Untuk menambah tekanan reservoir dan meningkatkan produksi minyak pada reservoir di Lapangan Sarina, diperlukan injeksi air ke dalam reservoir tersebut. Namun, injeksi yang dilakukan juga dapat menyebabkan pecahnya batuan tudung sehingga terjadi kebocoran fluida yang keluar dari reservoir tersebut. Untuk mencegah terjadinya pergerakan sesar dan pecahnya batuan tudung, maka diperlukan model geomekanika yang dapat memperlihatkan kondisi tegasan dan sifat mekanika batuan di bawah permukaan. Analisis geomekanika di bawah permukaan sangat penting dalam penentuan batas tekanan maksimum injeksi air agar tidak terjadi kebocoran fluida. Analisis geomekanika dilakukan pada delapan sumur pemboran dengan menggunakan data log talikawat dan data pengukuran langsung berupa data RFTdan FIT. Berdasarkan model geomekanika yang dihasilkan, tekanan pori di Lapangan Sarina pada interval ketiga reservoir berada pada kondisi underpressure dan pada interval serpih berada pada kondisi normal hidrostatik dengan gradien tekanan hidrostatik sebesar 0,45 psi/kaki. Tegasan vertikal memiliki nilai rata-rata sebesar 0,89 psi/kaki, tegasan horizontal maksimum rata-rata 0,78 psi/kaki, dan tegasan horizontal minimum memiliki nilai rata-rata 0,68 psi/kaki. Rezim tegasan yang terdapat pada Lapangan Sarina yakniSv>SHmax>Shmin berupa sesar normal. Batas tekanan injeksi maksimum yang terdapat pada Lapangan Sarina dalam kondisi stabil adalah 0,69 psi/kaki. Kata kunci: geomekanika, tekanan pori, tegasan in-situ, tekanan injeks
STUDI GEOKIMIA DAN PEMODELAN KEMATANGAN BATUAN INDUK FORMASI TALANGAKAR PADA BLOK TUNGKAL, CEKUNGAN SUMATERA SELATAN Susanto Sigit Wibowo; Eddy A. Subroto
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.2017.1.1.4

Abstract

Talangakar Formation sediment, which is believed to be one of the major source rocks in South Sumatera Basin. Ditch cutting and oil samples were analyzed using geochemistry analysis and followed maturity modeling. The total organic carbon contents of the sediment range from 0.4–80% TOC and there are two types of source rocks which are shale and coals. The samples analyzed have vitrinite reflectance in the range of 0.2-0.65% Ro and Tmax value between 400-4500 C, which indicate that Talangakar sediments contain immature to late mature organic matter. The sediments are dominated by mixed type II/III and type III kerogen. Typical oil and gas generating potential is anticipated from the sediments with fairly high hydrogen indices (HI) from 50-400 mgHC/gTOC. One dimensional basin modeling was performed to analyze the hydrocarbon generation potential and expulsion history. The source rock of the Talangakar Formation at well location is presently at a stage of early to main oil generation, no gas generation with thermal maturity ranging from 0.5- 1.3% Ro. The modeled burial history suggests that maximum burial occurred in the Pliocene.
ESTIMASI KEDALAMAN LAPISAN AKUIFER MENGGUNAKAN METODE VERTICAL ELECTRICAL SOUNDING DI DESA SENGKUBANG, KECAMATAN MEMPAWAH HILIR, KABUPATEN MEMPAWAH, KALIMANTAN BARAT Rantika, Ika; Muhardi, Muhardi; Perdhana, Radhitya
Bulletin of Geology Vol 7 No 2 (2023): 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.2023.7.2.1

Abstract

Desa Sengkubang merupakan salah satu desa yang berada di Kecamatan Mempawah Hilir, Kabupaten Mempawah, Kalimantan Barat, yang memperoleh air bersih dari sumur galian dan air hujan. Permasalahan yang sering dihadapi dari pemanfaatan air bersih tersebut adalah ketersediaannya yang masih sangat terbatas, sehingga diperlukan informasi tentang keberadaan air tanah pada lapisan akuifer yang lebih dalam. Tujuan penelitian ini adalah untuk mengidentifikasi sebaran nilai resistivitas bawah permukaan secara sounding dan mengestimasi kedalaman lapisan akuifer. Metode yang digunakan pada penelitian ini adalah metode vertical electrical sounding (VES). Pengambilan data di lapangan dilakukan di 4 titik pengukuran dengan bentangan elektroda arus masing-masing sebesar 500 m. Sebaran nilai resistivitas bawah permukaan secara sounding di lokasi penelitian yaitu 1,62 Ωm – 2.249,77 Ωm. Hasil interpretasi menunjukkan lapisan tanah bagian atas (top soil) memiliki nilai resistivitas 27,91 Ωm – 134,01 Ωm dengan kedalaman hingga 1,58 m. Lapisan bawah permukaan diduga berupa pasir dengan nilai resistivitas 3,83 Ωm – 60,90 Ωm, pasir lempungan dengan nilai resistivitas 15,87 Ωm – 17,95 Ωm, lempung dengan nilai resistivitas 1,62 Ωm – 5,50 Ωm, kerikil dengan nilai resistivitas 471,49 Ωm, dan batuan dasar dengan nilai resistivitas 1.014,38 Ωm – 2.249,77 Ωm. Hasil penelitian menunjukkan bahwa lapisan akuifer bebas (unconfinedaquifer) diidentifikasi di keempat titik sounding dengan kedalaman 0,30 m – 31,53 m, sedangkan lapisan akuifer tertekan (confined aquifer) hanya diidentifikasi di titik sounding 1 dengan kedalaman 22,70 m – 54,18 m. Kata kunci: Akuifer, geolistrik, resistivitas, vertical electrical sounding
HUBUNGAN PERINGKAT BATUBARA TERHADAP KANDUNGAN GAS METANA BATUBARA FORMASI WARUKIN BAGIAN TENGAH PADA SUMUR BSCBM-01, KABUPATEN PASER, PROVINSI KALIMANTAN TIMUR Sigit Arso Wibisono; Eddy A. Subroto
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. 2

Abstract

Analisis proksimat dan ultimat yang dilakukan terhadap 11 sampel batubara menunjukkan bahwa batubara Formasi Warukin bagian tengah pada sumur BSCBM-01 termasuk dalam klasifikasi peringkat batubara subbituminus dan mempunyai kerogen dominan tipe III yang cenderung menghasilkan gas. Selain itu, sampel teranalisis mempunyai kandungan air total 9,03 – 15,54%, kandungan sulfur 0,33 - 5,43%, kadar karbon tertambat 16,38 - 46,05%, kadar abu 2,24 - 60,89%, kadar zat terbang 19,77 - 50,25% dan nilai kalori 2.357 - 7.008 kal/g. Hasil analisis kandungan gas yang dilakukan terhadap 10 sampel batubara pada kedalaman 100 - 400 m menunjukkan bahwa sampel teranalisis mempunyai kandungan gas total 2,28 - 121,28 scf/ton dan persentase gas metana 12,04 – 96,32%.
The Analysis of Characteristic and Distribution of Natural Fracture on Basement Outcrop at Kedabang Cape, Batam Island, Kepulauan Riau Province Prakoso, Yehezkiel Festian
Bulletin of Geology Vol 5 No 4 (2021): 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.2021.5.4.3

Abstract

Kegiatan eksplorasi pada reservoir rekah alami membutuhkan pemahaman mendalam mengenai karakteristik rekahan alami seperti orientasi umum rekahan, sifat fraktal atribut rekahan, distribusi intensitas dan densitas rekahan pada Zona Hancuran Sesar (FDZ), serta faktor-faktor yang mengontrol distribusinya. Daerah penelitian secara administratif termasuk ke dalam wilayah Kecamatan Nongsa, Kota Batam, Provinsi Kepulauan Riau. Daerah penelitian secara geografis terbentang antara 1 ̊8’21” LU –1 ̊8’41” LU dan 104 ̊8’47” BT –104 ̊9’8” BT. Pengukuran data rekahan alami menggunakan metode linear scanline dan window scanline di daerah Tanjung Kedabang. Pengukuran data rekahan alami dilakukan pada batuan dasar granit dan riolit. Jumlah rekahan adalah 769 rekahan, berupa 587 rekahan terbuka (joint), 177 rekahan gerus (shearfracture), dan 5 rekahan terisi (vein).Rekahan terbuka berarah utara barat daya-selatan tenggara (NNW-SSE) dan barat-timur (ENE-WSW). Rekahan gerus berarah timur laut-barat daya (NE-SW) dan barat laut-tenggara (ENE-WSW). Rekahan terisi berarah timur timur laut -barat barat daya (ENE-WSW). Nilai intensitas rekahan alami di Tanjung Kedabang adalah 6-32 rekahan/m, sedangkan nilai densitas rekahan alami di Tanjung Kedabang adalah 0,09-0,42 cm/cm². Lebar zona hancuran dalam untuk Sesar Tanjung Kedabang adalah 23-90 m, sedangkan untuk sesar di singkapan YFP-A4 adalah 3,8 meter. Lebar zona hancuran sesar menunjukan hubungan linear dengan panjang dan pergerakan sesar. Intensitas dan densitas rekahan di dalam zona hancuran lebih besar dibandingkan di luar zona hancuran. Faktor kontrol distribusi intensitas dan densitas rekahan alami adalah struktur geologi dan litologi batuan dasar. Analisis sifat fraktal rekahan alami di daerah penelitian menghasilkan kesimpulan bahwa rekahan alami di daerah penelitian bersifat fraktal mengikuti distribusi power law. Nilai porositas rekahan batuan dasar di Tanjung Kedabang bervariasi pada rentang 0,01-0,09%. Permeabilitas rekahan berdasarkan Metode Cubes berkisar pada rentang 0,53-83,82 darcy, sedangkan berdasarkan Metode Matchstick berkisar pada rentang 0,40-62,86 darcy. Kata kunci: Batam, fraktal, rekahan, zona hancuran, scanlin
LESSON LEARN OF GEOCHEMISTRY OF HYDROCARBON GASES AND CO2 IN MESOZOIC PETROLEUM SYSTEM OF PAPUA NEW GUINEA: IMPLICATION FOR THE FOLD BELT PLAY CONCEPT IN EASTERN PAPUA, INDONESIA Penggalih, Muhammad Saung; Subroto, Eddy Ariyono; Susanto, Very
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)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2024.8.1.5

Abstract

The potential of oil and gas discovery at the Fold Belt Play concept in eastern Papua could be learned from the multiple production fields in Papua New Guinea Fault and Thrust Belt area which has similar geological condition. Therefore, the geochemical characteristic of hydrocarbon gases and CO2 at the Fold Belt Play concept is expected to be predictable by the analogy of those gases occurrence in Mesozoic petroleum system of Papua New Guinea Fault and Thrust Belt area. The hydrocarbon gases are of thermogenic origin, generated from Type II/III kerogen of Jurassic-Cretaceous source rock with gas maturity of about 1.2 to 2.0% Ro equivalent. The average CO2 percentage in Mesozoic reservoir at Papua New Guinea is ~1.58%. The relatively light d13C-CO2 (-25.2 to -10.4‰) unequivocally confirm that the low volume of CO2 is generated from kerogen maturation mechanism. For the Fold Belt Play concept in eastern Papua, the hydrocarbon gases are expected to have similar characteristic with the gases in Papua New Guinea. The low CO2 may probably only be found at Northern Fold Belt due to the preservation of thin-skinned deformation that have the basal detachment surface in the Kembelangan Group (Kopai Formation). On the other hand, the Central and Southern Fold Belt are predicted to contain moderate to high volume of inorganic CO2 migrated from Modio/Brug Dolomite. Key words: the Fold Belt Play, Mesozoic petroleum system, analogous, Papua New Guinea, eastern Papua
ANALISIS STRATIGRAFI DAN IDENTIFIKASI FASIES SEISMIK PADA INTERVAL BARENG LISU, DAERAH KOTAGARO, CEKUNGAN SUMATRA TENGAH Vebryatna, Vicco Oryzavica; Noeradi, Dardji
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.2019.3.2.6

Abstract

The Kotagaro area is one of the hydrocarbon field in the Central Sumatra basin one of the old giant hydrocarbon basins in Indonesia. Only Post-rift deposit are well explored in the Kotagaro are,while Synrift deposit of Pematang Group still not being explored as a reservoir, because they are not a focus in the development study. Research on synrift interval is expected to be new knowledge, especially in the Kotagaro area. This study aims to explore (new insights) regarding synrift interval by analyzing seismic facies and interpreting the depositional environments of the study area. This study used 2D and 3D seismic data and data from a well located outside the study area. Well data is used for well-seismic tie. The methods used in this study included well-seismic tie, 2D and 3D seismic interpretations the synrift intervals, generation of time structure maps and isochrones maps seismic facies analysis, and interpretation of depositional environments. Based on this analysis, the research area has four seismic facies, Chaotic Wedge (AM), Divergent Wedge (DM), Hummocky Wedge (HM), and Parallel Wedge (PM). The four seismic facies showed that the study area was deposited in the fluvial zone, alluvial fan zone, deep lacustrine zone, shallow lacustrine zone, and lacustrine shoreline zone.
LINEAMENT EXTRACTION AND THE CORRELATION TO VEGETATION AND MOISTURE INDICES FOR GROUNDWATER PREDICTION IN BENGKULU SELATAN REGENCY, INDONESIA Setiawan, Budhi; KAMIL, FADHELLATUL
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)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2022.6.2.7

Abstract

Lineament representsthe geological features in response to a weak zone that might manifestgroundwater potential. The researchaims to determine the relationship between the lineament extraction andvegetation and surface moisture indices. The study was conducted in South Bengkulu, Bengkulu, based on Shaded Relief images at azimuth 0o, 45o, 90o, and 135ofrom Digital Elevation Model (DEM) image processing through DEMNAS (8 meters). Then, analysis of vegetation and moisture indices using Normalized Difference Vegetation Index (NDVI), Normalized Difference Moisture Index (NDMI), and Moisture Stress Index (MSI) from Landsat 8 OLI/TIRS extraction image. The Pearson Linear correlation method is used forcorrelation analysis. Based on the analysis of the lineament data, there are 12,206 lineament patterns, dominantly trending in NW-SE, N-S, and NE-SW. The lineament density parameters showthe density level 0 km/km2-10.44 km/km2. The results of the correlation of data on lineament density to the image index have positive and negative trend values, namely: NDVI (0.16), NDMI (0.37), and MSI (-0.43). From the results,the highest density is straight to the vegetation and high surface moisture. Therefore, the analysis isusefulas an initial indicator of the potential presence of groundwater. Keywords: Groundwater, lineamentremote sensing, DEM, Landsat 8
ANALISIS MEKANISME TERJADINYA TEKANAN-LUAP DAN PREDIKSI TEKANAN PORI PADA LAPANGAN BD, CEKUNGAN JAWA TIMUR Ryan Surjaudaja; Agus Mochamad Ramdhan; Indra Gunawan
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.2017.1.2.2

Abstract

The East Java Basin is one of the sedimentary basins with proven petroleum system and very prospective as an exploration target. However, drilling in this basin is a risky operation because of the presence of overpressure, which is shown by kick and lost during exploration wells drilling in BD Field as an example. Drilling problems and drilling risks can be reduced by doing overpressure study, including overpressure generating mechanism, pore pressure prediction, and estimation top of overpressure. The temperature in this field can reach 80°C at the depth around 1500 m SSTVD. However, the Dutta-Katahara crossplot does not indicate any diagenesis of smectite to illite. It is also confimed by XRD data in one of the well, which shown domination of kaolinitic clay mineral. Based on the vitrinite reflectance data, there is no transformation of kerogene to hydrocarbon in this field. The burial history plot shows rapid sedimentation with the rate of 1723 m/million years. Based on those criterias, the main overpressure generating mechanism is interpreted to be loading mechanism. High sedimentation rate is related to the peak inversion in Plio-Pleistocene time, providing abundant of sediment supply into the basin. Pore pressure in this field can be estimated by using sonic data with Eaton’s method. Both direct and indirect pressure measurements, combine with drilling data are used to support this estimation. Based on well data, top of overpressure in this field is located at the depth around 1500-1600 m SSTVD. The top of overpressure is located within Lidah Formation.

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