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Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Published by Pusat Survei Geologi
ISSN : 08539634     EISSN : 25494759     DOI : https://doi.org/10.33332
Core Subject : Science,
Chemistry Earth & Planetary Sciences Energy
The JGSM acts as a publication media of high quality scientific investigations resulted from various geological scientific issues. Published articles covers Geo-sciences, Geo-resources, Geo-hazards, and Geo-environments. Geo-sciences are basic earth sciences in geology, geophysics, and geochemistry. Geo-resources are applied earth sciences scoping in geological resources. Geo-hazards are applied earth sciences concerning in geological hazards. Geo-environments are applied earth sciences focusing in environmental geology.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi
Articles 482 Documents
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Meningkatkan Faktor Perolehan Lapangan Marginal dengan Metode Injeksi Air, Sebuah Studi Simulasi Reservoar Edy Slameto
Jurnal Geologi dan Sumberdaya Mineral Vol. 16 No. 3 (2006): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v16i3.361

Abstract

The development of marginal fields is becoming a more important alternative method, due to the fact that big and profitable new fields are more difficult to be discovered. A marginal field which is situated in the Western Sunda Basin, here is called as Field X, has big enough reserves in which specific fluid property interest has to be concerned. Its OGIP: 7.675 BSCF and OOIP: 129.058 MMSTB (based on PSC source). According to the trap existing in the field, its drive mechanism is Gas Cap Drive and Water Drive. In order to increase the recovery factor of this field, Enhanced Oil Recovery (EOR) using water injection method has been carried out. Reservoir simulation performed with water injection project to this field could increase the cumulative oil production into 17.160 MMSTB with 13.29 % composite recovery factor for 30 years. Keywords : waterflood, reservoir simulation, marginal, Sunda Basin
Identification of Adakite from The Sintang Intrusives In West Kalimantan Udi Hartono; Suyono Suyono
Jurnal Geologi dan Sumberdaya Mineral Vol. 16 No. 3 (2006): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v16i3.362

Abstract

The Sintang intrusives are widely exposed in West Kalimantan, and as reported by previous workers, consisting of high level intrusives of stocks, plugs, dykes and sills of microdiorite, microgranodiorite, granite/ microgranite, quartz diorite, dacite, andesite, and minor rhyolite and rhyodacite. However, a careful study of published geochemical data gives a result that the rocks are of adakitic type. Considering the tectonic development of the South China Sea and northwest Kalimantan, the adakite was probably originated from magma as a result of melting of the subducted South Cina sea oceanic crust beneath Kalimantan continent. The subduction started in the Late Oligocene when the crust was still young. Keywords : adakite, Sintang, intrusive, Late Oligocene
Karakteristik Formasi Seblat di Daerah Bengkulu Selatan Rahmat Heryanto
Jurnal Geologi dan Sumberdaya Mineral Vol. 16 No. 3 (2006): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v16i3.363

Abstract

The Seblat Formation is an oldest Tertiary sedimentary rock in Bengkulu Basin, which was made up of a clastic sedimentary rocks and were deposited in regretion condition. The lower part was deposited in an open sea shelf – fore slope and the upper part in a fore reef - lagoon shelf environment. The sandstones of formation consist of arkose, litharkose, felspathic litarenite, and litarenite. The framework of grains comprises quartz, feldspar, and rock fragments. Matrix/cement consists of clay and calcareous clay. Accesories mineral are muscovite, epidote, and glouconite. Clasts which formed the sandstone were probably derived from a magmatic arc and recycled orogen of the Pre-Tertary Gumai- Garba Zone. Diagenetic processes recognized are compaction and the formation of authigenic minerals and secondary porosities. Their diagenetic stage were included in the mesogenetic mature A, which equivalent to mudrock stage II, with the paleo temperature80º to 95ºC, and the burial thickness of 2 to 3 km. The mudstone within the Seblat Formation indicates an oil source rock, whereas the sandstone and limestoneare good for a reservoir rock. Keywords : Seblat Formation, diagenesis, compaction, authigenic mineral, mesogenetic
Hubungan Keberadaan Runtunan Ofiolit dengan Konsentrasi Unsur Logam dalam Endapan Sungai Aktif di Daerah Pelaihari, Kalimantan Selatan Baharuddin Baharuddin
Jurnal Geologi dan Sumberdaya Mineral Vol. 16 No. 4 (2006): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v16i4.364

Abstract

Pelaihari and its surrounding area which belong to the Tambak-Tamban- Bobaris Zone are part of the western limb of the Meratus High. The area has significant metalliferous mineral prospects. Geologically, the area is occupied by ultramafic, intrusive, volcanic, sedimentary, and metamorphic rocks with ages range from Mesozoic to Tertiary. The results of geochemical analyses of active stream sediment samples in this area indicate a close relationship between the distribution of the rocks and concentration of metallogenic elements within the stream sediment samples. Concentration of nickel (Ni) and copper (Cu) elements increase within the stream sediment in the northeastern area while platinum (Pt) and cobalt (Co)show a significant high concentration value in the southern area except Co which also has a high concentration value in central and northeastern area. This high metallogenic concentration presumably derived from the existence of ophiolite sequence in this area. Keywords: Ophiolite sequence, active stream sediment, concentration of metallogenic elements
Petrogenesis of The Sintang Intrusives and Its Implications for Mineralization In Northwest Kalimantan Udi Hartono
Jurnal Geologi dan Sumberdaya Mineral Vol. 16 No. 4 (2006): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v16i4.365

Abstract

Arc magmatism is a direct response to tectonic and chemical processes operating in subduction zones. The Sintang Intrusives consist of microdiorite, microgranodiorite, granite/ microgranite, quartz diorite, dacite, andesite, and minor rhyolite and rhyodacite (dacite predominant). Depletion of Nb relative to K and La concentrations are characteristics of the rocks, implying the magma was generated in a subduction zone environment. However, different from magma of other “normal” arcs that were derived from mantle wedges, the magma of the Sintang Intrusives was generated from subducted oceanic crust melting. The result of a careful study of trace element data show that the rocks are of adakite type, characterized by high Sr/Y and Zr/Sm ratios, moderate to strong fractionation of heavy rare earth elements (HREE) and absence of Eu anomalies suggesting melt extraction from garnet-amphibolite sources. By considering the tectonic development in the South China Sea and northwest Kalimantan, it is believed that the magma was probably originated from the melting of previously subducted South China sea oceanic crust (dead slab or fossil subduction) beneath Kalimantan continent in the Late Oligocene - Early Miocene. A compressive tectonic regime in Middle Oligocene, and possibly until Late Oligocene, led to crustal shortening and thickening that facilitated entrapment of arc magma in the Kalimantan crust. The fluid released caused by amphibole breakdown and may have been expelled from older amphibolebearing plutons during compressional tectonics would be significantly important for mineralization. Keywords : Kalimantan, Sintang Intrusives, oceanic crustal melting, mineralization
Aplikasi Fasies Sedimen Fluviatil terhadap Perubahan Iklim Global (Studi Kasus: ”Geologi Kuarter Dataran Aluvium Rawa Utara Betung, Kabupaten Banyuasin, Sumatera Selatan” ) Herman Moechtar
Jurnal Geologi dan Sumberdaya Mineral Vol. 16 No. 4 (2006): Jurnal Sumber Daya Geologi
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v16i4.366

Abstract

The Quaternary deposits in the studied area comprise sand of fluvial origines, separated by clay deposits of swamp, backswamp, and floodplain. The fluvial channel was characterized by the increase and decrease of axial bodies. Vertically, the character of fine-grained deposits showed the changing in colour and percentage of humic and peat contents. Differences in the amount of clastic supply was caused by the changes in climatological conditions. Climate is an important and independent force in controlling the weathering, erosion, and sediment supply to Quaternary deposits of swampy alluvial basin. A systematic change in the type of fluvial system on the swampy alluvial plain could be the result of the changes in the sediment supply and ratio between coarse-grained bedload and suspended load. It means, the sedimentary processes on the basin can develop under the condition of climatic changes. Key words: Quaternary deposit, fluvial, swamp, climate
Peran Deformasi Pensesaran Mendatar Terhadap Pembentukan Beberapa Cekungan Kecil Paleogen di Sumatera Barat dan Jambi Syaiful Bachri
Jurnal Geologi dan Sumberdaya Mineral Vol. 16 No. 4 (2006): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v16i4.367

Abstract

Peleogene small basins (sub-basins) occur in West Sumatra and Jambi, either in the volcanic arc or in the southwestern margin of the Central Sumatera Basin area. According to previous reports, the small basins were developed due to regional extensional tectonics. On the basis of radar image interpretation, supported by field observation on some structural features, the small basins are interpreted to have been formed by a regional strike-slip system related to deformation of the Sumatera Fault. Smaller scaled structures may be developed within the strike-slip fault zone, either as strike-slip faults, normal faults, or combined strike-slip and normal faults, forming a braided structural pattern. Convergent movement within the braided zone may result in uplifting of some blocks, whilst the divergent movement will result in a low morphology to form relatively small basins. Keywords: Paleogene Basin, strike-slip deformation, Sumatera Fault, convergent, divergent
Akibat Ketidakstabilan Lereng Cekungan Dasar Laut pada Batuan Sedimen Neogen di Desa Kananggar, Kabupaten Sumba Timur, Nusatenggara Timur Prijantono Astjario
Jurnal Geologi dan Sumberdaya Mineral Vol. 16 No. 4 (2006): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v16i4.368

Abstract

Indonesia has thousands of islands in various tectonic settings and, in consequence, it has an immense variety of submarine slopes. Due to the ongoing orogenic processes, Cenozoic basins have emerged, and their evolution can be studied in more detail. Giant slide masses entirely made up of an incoherent association of broken, folded, and crumpled strata occuring along the transect to Kananggar. The best exposed example is located ENE of Kananggar. It follows on top and laterally from a succession of about 100 meter of very thick-bedded, stacked debris, flow-turbidite channels. The slide could be observed 2 in an area of some 10 km . The observed thickness is in order of 120 m and the mass is directly overlain by a normal stratified pelite-turbidite succession. Keywords: slope, basin, sea floor, slide, Kananggar
Sifat-Sifat Fisika Batuan Pulau Biak dan Pulau Supiori, Irian Jaya W.H Simamora
Jurnal Geologi dan Sumberdaya Mineral Vol. 16 No. 5 (2006): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v16i5.369

Abstract

The stratigraphical units of Biak, Irian Jaya Quadrangle, scale 1:250.000 consist of the Tertiary volkanic and sedimentary rocks, the pre-Tertiary metamorphics and recent alluvial. The studied area is in Biak and Supiori Islands, Irian Jaya bounded by longitudes 135°45' - 136°23'E and latitudes 0°36' - 1°36'S. Thirty six rock samples from investigated area have been collected and analyzed in a laboratory. The physical characteristics of samples analyzed include density (?), porosity (ô), magnetic susceptibility (?), and velocity of seismic wave ( Vp and Vs ). The result shows that the value of densities are within the range of 1.86 - 2.60 gr/cc, permeability -6 2.31 - 35.27%, magnetic susceptibilities are whitin 2,2 - 32,23 x 10 cgs emu The value of wave velocities (Vp) are around 2.2 - 5.4 km/sec, and Vs are within 1.1 - 3.1 km/sec. The result of rock samples analysed in area indicates that density distribution of less than 2.0 gr/cc and permeability distribution of > 20% may have high degree of water saturation. Keywords : Rock physical, density, porosity, magnetic susceptibility, velocity of seismic wave
Perkembangan Struktur Geologi Bawah Permukaan Berdasarkan Hasil Analisis Data Gaya Berat Di Utara Kendari, Sulawesi Tenggara; Implikasinya Terhadap Kemungkinan Terdapatnya Sumber Daya Geologi D.A Nainggolan
Jurnal Geologi dan Sumberdaya Mineral Vol. 16 No. 5 (2006): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v16i5.370

Abstract

The result of gravity measurement in the studied area, which is mainly covered by ophiolite, has an anomaly value of ranging from -8 to 86 mgal. Geological and tectonical development of the area have similarities with the east arm of Sulawesi. The presence of hydrocarbon in the Batui quadrangle might be possible to be preserved in this region. Interpretation of the anomaly patterns, subsurface profile models, including the geological structures depict the geological processes, tectonics and its relationship with natural resources. The qualitative analysis results of residual and Bouguer anomalies indicate that the structures in the researched area mainly have northwest - southeast and southwest – northeast directions. Meanwhile, the quantitative analyses of three subsurface model profiles show the presence of two kinds of sedimentary rock with the density of 2.20 gr/cc and 2.35 gr/cc. Keywords : gravity, hydrocarbon deposit, Bouguer anomaly, Kendari

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