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Tektonostratigrafi Cekungan Timor di Bagian Barat Pulau Timor Syaiful Bachri; Asep Kurnia Permana
Jurnal Geologi dan Sumberdaya Mineral Vol. 16 No. 2 (2015): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v16i2.43

Cekungan Timor terletak di bagian barat Pulau Timor, dan Pulau Timor sendiri secara keseluruhan tersusun oleh 3 (tiga) satuan tektonostratigrafi, yaitu satuan para-autokton, satuan alokton dan satuan autokton. Satuan para-autokton berasal dari Paparan Baratdaya Australia yang terpindah-tempatkan ke wilayah Timor bersama-sama (menumpang) di atas batuan alasnya. Sementara satuan alokton berasal dari Busur Banda pra-tumbukan yang tersesar-naikkan di atas satuan para-autokton. Adapun satuan batuan yang terendapkan tidak selaras di atas kedua satuan lainnya disebut satuan autokton yang terendapkan sebagian sin-orogenik sampai pada umumnya pasca orogenik. Satuan para-autokton berumur Perem sampai Jura Tengah, sementara satuan alokton berumur Jura Akhir sampai Pliosen. Di lain pihak, satuan autokton berumur Miosen Akhir sampai Plistosen Awal.Kata Kunci - Cekungan Timor, Timor bagian barat, satuan para-autokton, alokton, autokton.

FASIES KIPAS BAWAH LAUT PADA BATUAN BERUMUR PEREM-TRIAS, DAERAH KEKNENO, CEKUNGAN TIMOR Asep Kurnia Permana; A.H Prastian
Jurnal Geologi dan Sumberdaya Mineral Vol. 14 No. 4 (2013): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v14i4.74

Cekungan Timor termasuk kedalam kategori semi mature yang memiliki potensi hidrokarbon, namun kompleksitas kondisi geologi dan banyaknya konsep yang berbeda-beda merupakan salah satu penyebab stratigrafi di cekungan ini sulit dimengerti. Penelitian stratigrafi rinci untuk mengidentifikasi fasies dan sub fasies lingkungan pada batuan berumur Perem-Trias dilakukan di daerah Kekneno, Nenas, Cekungan Timor untuk memberikan pandangan baru mengenai stratigrafi, sedimentologi dan fasies lingkungan pengendapan pada batuan berumur Perem-Trias di cekungan ini. Hasil analisis litofasies menunjukkan bahwa batuan yang berumur Perem di daerah Kekneno diendapkan pada fasies lereng bagian bawah sampai atas (lower to upper slope facies), sedangkan batuan berumur Trias umumnya diendapkan sebagai fasies sistem kipas luar (outer fan system facies), fasies paparan luar samping lereng atas (outer shelf to upper slope facies), fasies sistem kipas tengah (middle fan system facies), dan fasies sistem kipas dalam (inner fan system facies). Endapan-endapan alur (channel) dan pematang (levee) pada batuan berumur Trias berpotensi menjadi target play hidrokarbon.Kata Kunci: fasies, kipas bawah laut, batuan Perem-Trias, Cekungan Timor

Model Fasies Batuan Karbonat Formasi Wainukendi di Cekungan Biak-Yapen, Papua Asep Kurnia Permana; Joshua Shima; Sigit Maryanto; Joko Wahyudiono
Jurnal Geologi dan Sumberdaya Mineral Vol. 20 No. 2 (2019): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v20i2.129

This paper provides the carbonate rocks facies model of the Wainukendi Formation. Several outcrops are well exposed in the Southern part of the Supiori Island. The main data are taken from 28 outcrops and 25 measured sections. Thirty seven rocks samples from the Korido dan Warvey Sections were collected and have been petrographic examination for microfacies analysis. Finally, the analysis find that the Wainukendi Formation basically composed by bioclastic carbonate platform and reef margin platform. Microfacies analysis indicate that these carbonate platforms consist of 4 facies zone, deep shelf (FZ2), toe of slope (FZ3), slope (FZ4), and platform margin (FZ5). Keywords: Facies, stratigraphy, Wainukendi Formation, Biak-Yapen Basin.

DEPOSITIONAL ENVIRONMENT OF THE SAROLANGUN COALS, SOUTH SUMATRA BASIN Asep Kurnia Permana; Hermes Panggabean
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 4 (2011): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i4.149

The Muaraenim Formation, a Late Miocene unit within the South Sumatera Basin, is included in some of the most significant coal resources in Indonesia. The upper part of the unit exposed in the Sarolangun Region, where it consists mainly of sandstone and shale, with relatively thin (< 1.5 m) coal beds. Lithofacies analysis of the outcropping strata indicates that deposition took place in a terrestrial to marine environment. Microscopic analysis shows that the coal consists mainly of vitrinite maceral group (telovitrinite and detrovitrinite), with having a rare to sparse inertinite and minor liptinite and mineral matter. Palynological studies show abundant pollens, derived from mangrove vegetation that grew in a fresh water environment. The GI and TPI values, calculated from detailed maceral analysis, when plotted on similar diagrams to those developed by Diessel (1992) show the coals to have two different facies characteristics. Some of the coals, especially those having a high vitrinite content, show high TPI and relatively high GI values, suggesting that deposition was in upper delta plain and fluvial environments (wet forest swamp) with a relatively high rate of subsidence. Other coals have much lower TPI but higher GI values, indicating that peat was possibly developed in in a lower delta plain, with relatively slow subsidence conditions. Some coal samples also have high proportions of pyrite and other mineral matter, and thus it might have been deposited in more brackish environments. The change reflects the onset of marine transgression near the top of the Muara Enim sequence. Palynological analysis indicates the occurrence of fresh water and mangrove vegetation, supporting deposition in wet and possibly partly brackish conditions.Keywords: Depositional environment, Sarolangun coals, South Sumatera Basin, Indonesia

CLEAT CHARACTERISTICS IN TERTIARY COAL OF THE MUARAENIM FORMATION, BANGKO AREA, SOUTH SUMATERA BASIN: Implications for Coalbed Gas Potential Asep Kurnia Permana; Hermes Panggabean
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 5 (2011): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i5.153

The sub-bituminous coal seams of the Muaraenim Formation commonly overlie claystone, sandstone or shaly siltstone. Coal seams are mostly dull to bright banded lithotype, well developed of cleat system, maceral composition dominated by vitrinite with rare inertinite and minor liptinite and mineral matter. In order to determine cleat systems and a possible relationship with the development of coalbed gas potential within the coal seams, detailed observation on coal seams characteristics, determination and measurement on cleat pattern and orientation, as well an insitu gas in place content measurement (Q1) within the coal measures were performed. Field measurement from outcrops demonstrate well-developed cleat within the coal seams, with high in spacing (âˆ‘ 8.93 cm) and moderate in density (0.1512/cm - 0.21/cm) and cleat aperture (1 - 3 mm). SEM analysis provides microcleat characteristics with a rare to medium density. Micro focus observation and examination on microcleat, face microcleats appears to be most prominent compared to butt microcleats. Microcleats also found mostly in open aperture. Gas content of the coal seam indicates a low to moderate methane content, with overall calculation of gas in place from six coal seams around 15.297,73 scf. Moderate level of mineral matter content in coal, as well as an excessive rare of clay minerals infill in microcleat may influence on increasing methane adsorption capacity. Moderate to high density and well continuity of cleat and microcleat could affect enhancing permeability, and plays important role in methane migration and production. Indeed, the coal characteristics and cleat systems of the Muaraenim Formation maybe favorable for coalbed gas potential.Keyword: Coalbed gas, Cleat systems, Muaraenim Formation

Aplikasi Petrologi Organik Dalam Analisis Cekungan dan Eksplorasi Hidrokarbon pada Beberapa Cekungan di Indonesia dan Australia Asep Kurnia Permana
Jurnal Geologi dan Sumberdaya Mineral Vol. 18 No. 3 (2017): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v18i3.235

The organic petrology is useful in many aspects of geological applications. This method is mainly applied for geoscience investigation, such as basin analysis, fossil fuel resources exploration, and coal utilization. In the last few years, organic petrology has been applied in other fields such as environmental, archeology, and forensic studies. Study of organic petrology and its applications have also been applied in some Indonesian and Australian Basins. The organic petrography method was combined with other analytical techniques to get comprehensive results, for instance Scanning Electron Microscope (SEM), Palynology, Rock-Eval Pyrolysis, Gas Chromatography-Mass Spectrometry (GC-MS), X-Ray Diffraction (XRD), X-Ray Fluorescence (XRF), and Microfocus X-Ray Tomography. Combination of those analytical techniques have been widely used for identification and characterization of organic matter and mineral matter association, even more quantification as well asÂ assessment of the maturity level and rank of organic matter in the organic rich sediments. This paper provides a review of the organic petrology application in basin analysis and hydrocarbon exploration. This research is focused on application of Organic petrology for reconstruction of paleoenvironment, geological history, hydrocarbon source rocks, and unconventional hydrocarbon potential in some Indonesian and Australian Basins.Â Â Keyword:Â organic petrology, basin analysis, hydrocarbon explorationÂ

COAL CHARACTERISTICS OF SAROLANGUN - PAUH REGION: Implication for Coalbed Methane potential Asep Kurnia Permana
Jurnal Geologi dan Sumberdaya Mineral Vol. 18 No. 6 (2008): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v18i6.255

The world energy crisis has effected the Indonesian energy supply, inspite of Â Indonesia is rich in another potential geo- resources, such as Coalbed Methane (CBM), which can be used for solving this crisis. The geology and coal characteristics of the Muaraenim Formation in Sarolangun - Pauh region, suggest that the Coalbed methane resource in this area is prospective. Detailed organic geochemical and petrographical study, using fresh surface and subcrop samples of coal was conducted. Petrographically, the coal mainly consists of vitrinite group, and is essentially composed telovitrinite, telocolinite, and detrovitrinite, with rare to sparse inertinite, and minor exinite and mineral matter. A geochemical result indicates the range of volatile matter content is from 13.39% to 33.50%, total sulphur from 0.11 to 2.38%, ash between0.68% and 52.4%, and moisture 18.01 up to 40.18% , with vitrinite reflectance values ranges from 0.35% to 0.47% . Furthermore the feature of micro-cleats or micro-cracks from SEM analysis are dominated by strike lines although some curved and sub-curved lines are also present. Open microcleats are predominant compared to close microcleats. Based on Barbara and Winter diagram, coalbed methane content derived from the Sarolangun- Pauh coal seam is expected to be low - moderate level, with methane content is present from 2.89 m3/t to 6.02 m3/t. SBC coalfield area shows that gas content is around 338.001, 354.6234 scf, Lubuk Napal is 743.232.370, 6576 scf, whilst the Sungai Dingin about 419.343,508.7245 scf.Â Keywords : coal characteristics, Â Sarolangun-Pauh Â Region, coalbed methane (CBM).

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