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Nurcahyo Indro Basuki
Program Studi Teknik Geologi, Fakultas Ilmu dan Teknologi Kebumian, Institut Teknologi Bandung (ITB)
Earth & Planetary Sciences Energy Engineering

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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.
LATERITISASI PADA KOMPLEKS MELANGE AREA WAILUKUM, KABUPATEN HALMAHERA TIMUR Aditya Rizki Ramadhan; Nurcahyo Indro Basuki; Bambang Priadi; Bronto Sutopo; Abdul Bari
Bulletin of Geology Vol 4 No 1 (2020): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

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Abstract

This research is prompted by the presence of laterite deposit from different lithology in Wailukum Area, Buli Districts, Eastern Halmahera Region The research area is part of PT. Antam UBPN North Maluku IUP. The coordinates of research area are 412.369-413.763 mT and 89.304-88.384 mU zone 52N, and with research area of 1,4 km2. This research’s objective is to determine the characteristics of laterites and bedrock in Wailukum area.. Data used in this research are DEM, LIDAR, field data and borehole data DEM and field data analysis are used to determine the topographic unit Field data analysis are used to make geological map and cross section. Geostatistical analysis on borehole data, consist of assay and drill log data (470 sample) are used to determine laterite deposit and bedrock characteristic. Based on petrography analysis, bedrock in Wailukum are serpentinite, moderately serpentinized orthopyroxenite and weakly serpentinized olivine gabbronorite. Melange complex in Wailukum consist of serpentinite, orthopiroxenite and olivine gabbronorite as a boudinage and surrounded by foliatd serpentinite as a matrix. This melange complex predicted as as result of a collisional event. Terniary SiO2-MgO-Fe2O3 diagram analysis shows that type of lateritization is dry laterites with silica deposition. Laterite deposit divided into limonite and saprolite. Topographic unit divided into hill slope and lowland basin. Landslide process in hillslope area causes thin laterite deposit. Lithology in hillslope area are divided into lithology with gabbro domination and lithology with serpentine domination. Lateritization in lithology with gabbro domination are poor lateritization and ore zone are not formed. Latertization in lithology with serpentine domination are good lateritization and ore zone are formed in saprolite and lower part of limonite. Ni is in nickeliferous serpentine which cause Ni has strong positive corellation with Co, Fe, MnO and Cr2O3. There is landslide accumulation in lowland basin.which cause thin laterite deposit and ore zone in limonite.
Co-Authors Abdul Bari Aditya Rizki Ramadhan Bambang Priadi Bronto Sutopo Dwiharso Nugroho Zurisman Fitriadi