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All Journal Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Bambang Suci Widijono, Bambang Suci
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Education Energy Engineering Environmental Science

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STRUKTUR GEOLOGI BAWAH PERMUKAAN LINTASAN PANGALENGAN-SUBANG, IMPLIKASINYA TERHADAP KESTABILAN LAHAN Subagio, Subagio; Widijono, Bambang Suci
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 6 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The high anomaly pattern of West Java extending from Banten Province to the boundary of West - Central Java area, changes to low anomaly pattern in Bandung to Pamanukan. This phenomenon formed anomaly alignment with high gradient in the boundary part of both anomaly patterns. The profile pattern of Bouguer anomaly along Pangalengan­Subang and Gudangkahuripan-Parongpong sections show more detailed illustration of the subsurface geology structures. Qualitative and quantitative gravity analyses that were supported by surface geological data, sediment thickness, and remote sensing data, estimate that the anomaly alignment reflects a fault that formed a big graben. The anomaly profiles also describe some fault forming some horsts and grebens. Based on erotion intensity esoect in the mountainous area, and geological structures, the land stability of this area is interpreted as very low. Keywords.' high, low, anomaly alignment, structure, Pangalengan-Subang Section, horst, graben, land stability
MEDAN GAYA BERAT PADA BATUAN OFIOLIT (ULTRAMAFIK) DI BEOGA, PAPUA DAN IMPLIKASI TERHADAP GENESIS ALIH TEMPATNYA Setyanta, Budi; Widijono, Bambang Suci
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 3 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

In Beoga, Puncak Jaya, Papua, a group of ultramafic rocks consisting of piroxenite, dunite, serpentenite and peridotite are exposed. The distribution of these rocks are very large, lying alongside east - west direction, reaching 50 km and 100 km long. The gravity fields in this region exhibit an elliptic gravity anomaly pattern ranging from -25 to 160 mGals. The gravity modelling and geological analysis suggest that ophiolite has been fragmented and exposed due to obduction, caused by an interaction between Pacific oceanic and Australian granitic plates. This tectonic setting may cause Mulia and its surrounding area to be susceptible to geological hazards such as earthquake and landslides. Keywords : gravity potentials, ophiolite, genesis, geology potential
THE POSSIBILITY OF HYDROCARBON TRAP AND ITS POTENTIAL IN THE NORTH BONE BASIN, BASED ON GEOLOGICAL AND GEOPHYSICAL DATA Siagian, Hari P; Widijono, Bambang Suci
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 1 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Based on the analysis of geological and geophysical data, it can be informed that investigated area is the sedimentary Bone basin formed since the beginning of the Tertiary age and developed through Paleogen to the Neogene. The basin is defined as a fore-arc basin underlain unconformable by pre-Tertiary basement rocks comprising metamorphics, volcanics, metasediments (the Laitimojong and Pompangeo Complexes). The hydrocarbon occurrence in Bone Basin showed by gas seeps in the surface are located in Pongko and Malangke villages. Some hydrocarbon traps such as structures and stratigraphy are shown in the seismic profiles. Abundant coarse clastic and limestone deposits such as the fluviodeltaic of Toraja and Lamasi Formations may plays as good reservoir in the basin. claystone within the Lamasi Formation and shale within the Toraja Formation predicted as petroleum source rocks in the area. The seals in the basin considered as the existence of numerous claystone and siltstone horizons within the Bone Bone Formation that is also indicated by the drilling results. Keywords : sedimentary basin, hydrocarbon potential, trap, Bone Basin 
DELINEASI CEKUNGAN SEDIMEN SUMATRA SELATAN BERDASARKAN ANALISIS DATA GAYA BERAT Setiadi, Imam; Setyanta, Budi; Widijono, Bambang Suci
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 2 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

South Sumatra Basin is one of large sedimentary basins in Indonesia which has been proven to produce hydrocarbon energy. Several literatures mention different amount of subbasin with this basin. Gravity is one of geophysical methods that is used to interpret lateral and vertical basin configuration based on rock density parameter. The gravity analysis is conducted by using spectral analysis method in order to estimate shallow and depth anomaly sources, and then to separate regional and residual anomaly using moving average method. The result of spectrum analyses show two discontinuity density plans, located at 3.05 km reflecting the average depth of Tertiary sedimentary basement, and at 15.98 km reflecting Moho discontinuity plane. Meanwhile, the residual anomaly shows that there are two lineament patterns trending northwest-southeast and southwest- northeast. The main fault is Sumatra Fault indicating northwest-southeast lineament, and the subsidiary faults trending southwest-northeast. Azimuth of shallow basement and rifting patterns are northwest-southeast, while the number of identified subbasin are 10. The result of two dimensional modeling shows that the basement in South Sumatra is metamorphic rock having the density contrast 0.12 gr/cc and the average density contrast of the sedimentary rocks filling the basin is -0.22 gr/cc.Keywords : gravity, spectral analyses, moving average, South Sumatra Basin
Co-Authors Budi Setyanta, Budi Hari P Siagian, Hari P Imam Setiadi, Imam Subagio Subagio, Subagio