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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 5 Documents
 1 
Search results for , issue "Vol 1 No 1 (2017): Bulletin of Geology" : 5 Documents clear
ANALISIS KUANTITATIF AKTIVITAS TEKTONIK R ELATIF DI PEGUNUNGAN BATURAGUNG JAWA TENGAH Rahmi Mulyasari; Budi Brahmantyo; Supartoyo Supartoyo
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.2017.1.1.3

Abstract

Neotectonics is a major controlling landform development in tectonically active regions, and it has significantly affected fluvial systems and mountain – front landscapes in the Baturagung Mountain, Central Java. This area is one of areas in Indonesia which is prone to earthquake from subduction zone in Indian Ocean and active fault in land. The earthquake sources from active fault probable from Opak and Dengkeng fault located in Baturagung Mountain. To assess tectonic activities in the area used quantitative approach (morphometric analysis). Morphometric analysis was used to identify the relative tectonic activity index (RTAI) in Baturagung Mountain consist of 5 parameters geomorphic indices: basin asymmetry (AF), hypsometric integral and curve (Hi and Hc), stream length gradient index (SL), basin indices (Bs), and mountain – front sinuosity (Smf). RTAI in this area is divided into three classes: Class 2 (high), Class 3 (moderate), and Class 4 (low). Distribution of RTAI in 65 subbasins area (207.2 km2) is: about 0.6% of watershed area (1.32 km2) Class 2; 58.9% (122.1 km2) of Class 3; and 40.4% (83.75 km2) Class 4. All of morphometry analysis generally indicates this area more influenced by tectonics than erosion. The results are consistent with field observations on landforms and geology.
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.
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.
ANALISIS GEOMEKANIKA PADA BATUAN DASAR, DI AREA JS-1 RIDGE BAGIAN SELATAN, CEKUNGAN JAWA TIMUR UTARA Agung Gunawan; Benyamin Sapiie; Bintoro Wibowo
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.2017.1.1.1

Abstract

East Java basin is one of production basin in Indonesia. Recently, basement is began evaluated more detail, and also has become one of exploration target in this area. Geomechanics and critically stress fractures analysis are some of methods which is used to evaluate basement potential. These methods are used to evaluate fractures which contribute to fluid flow in basement. Fracture interpretation is done in 2 (two) exploration well, Well-A and Well-B. The result of interpretation show the orientation of natural fracture in both wells is Northeast- Southwest (NE-SW). The orientation of SHmax in Well-B is Northeast Southwest (NE-SW) perpendicular to the breakout fractures. The orientation of Shmin in Well-B is Northwest-Southeast (NW-SE) parallel to breakout fractures. In this research, geomechanics model has only been carried out based on Well-B. The model shows that tectonic regime is strike-slip, the major stress orientation is Northeast-Southwest (NE-SW). The critically stress fracture analysis show that fracture orientation, which is in critical condition, is N 10o-20o E and N 65o E. These fractures are considered contribute to the fluid flow in basement.
KARAKTERISTIK TEKANAN LUAP DAN PENYEBABNYA PADA DAERAH LEPAS PANTAI SELAT MADURA Yudha Risnandar Sinulingga; Agus Mochammad Ramdhan
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.2017.1.1.2

Abstract

The East Java Basin is known as one of the prolific Tertiary hydrocarbon basin. This basin is also well known for its overpressure characteristic which occurs as a problem in drilling activity. Overpressure in East Java Basin generally occurs in Plio-Pleistocene interval which deposited in depression by rapid sedimentation rate. Wireline logs, pressure direct measurements, drilling mudweight and drilling events from four offshore exploration wells in Madura Strait are analysed to study overpressure characteristics and its mechanism. Eaton’s and Swarbrick’s Method are used to estimate the magnitude of pore pressure in research area. The location of research area within Kendeng Trough that physiographycally is a continuation of Kendeng-Randublatung Depression to the east might cause rapid sedimentation of thick sediment that would led to the generation of overpressure.

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