Asep Kurnia Permana
Center for Geological Survey

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3-D Imaging of Cleat and Micro-cleat Characteristics, South Walker Creek Coals, Bowen Basin, Australia: Microfocus X-ray Computed Tomography Analysis Permana, Asep Kurnia
Indonesian Journal on Geoscience Vol 7, No 1 (2012)
Publisher : Geological Agency

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DOI: 10.17014/ijog.v7i1.131The Permian coals of the South Walker Creek area have a moderately to highly developed cleat system. The cleat fractures are well developed in both bright and dull bands, and generally parallel, inclined or perpendicular to the bedding planes of the seam, with the spaces open or filled by mineral matter, such as clay and carbonate minerals. Microfocus X-ray computed tomography (CT) technique was performed to identify cleat characteristics in the coal seams. This technique allows visualizing of microcleat distribution and mineralization in three dimensional images. Cleat mineralization in the coal seam occurs either as single mineral (monomineralic) or intermixed mineral (polymineralic) masses. The cross cutting relationship was shown by X-ray CT scan analysis. The timing of microcleat formation in the coal seam from early to late is carbonate minerals, clay minerals (kaolinite) plus minor high density (rutile or anatase) phases. Thus, a high resolution of microfocus X-ray CT does not only provides a better visualization, but also could identify microcleat orientation, cleat mineralization, and generation of microcleat.
ANALISIS FASIES DAN PERMODELAN SIKUEN STRATIGRAFI BATUAN KARBONAT LINTASAN KORIDO, FORMASI WAINUKENDI, KABUPATEN SUPIORI, PAPUA Shima, Joshua; Nugroho, Hadi; Fahrudin, Fahrudin; Permana, Asep Kurnia
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Geological Engineering E-Journal

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Korido is located in Supiori District , Papua , Indonesia . This area is in the north of the Central Range and included in the North Irian Basin which is the fore arc basin (Mc Adoo & J.C. Haebig, 1999). Own research area based on geology map created by Masria et al ( 1981) composed by Wainukendi Formation which is composed predominantly by carbonate sedimentary rocks .The purpose of this study is to determine the pattern of lithology and lithological boundaries were obtained from measured stratigraphy along the trajectory of research which is then integrated with the micro facies analysis and facies zone were obtained by petrographic analysis to determine the depositional environment and depositional processes that occur in Wainukendi Formation. More over, the relative age determination is also done based on the analysis of large benthic foraminifera so the deposition process can be integrated with relative age . The ultimate goal of this research is to integrate field data, micro facies analysis results and deposition process analysis results to create a model of sedimentation, determining stratigraphic marker, and the determines system tract that develops in Wainukendi Formation in the study area .The method used in this research is geological mapping focused on stratigraphy subjects in Korido area to get  lithostratigraphy sequence, platform type, sedimentation processes, and laboratory analysis include petrographic analysis to determine micro facies and facies zone and paleontological analysis to determine the relative age which then integrated to obtain stratigraphic marker and systems tract that develops in Wainukendi Formation. From the analysis of platform type showed the type of platform existing in this area is rimmed shelf type which is then used as a reference in micro facies analysis according to Wilson (1975) to obtain 4 facies zone that exist in this study area is reef platform margin , slope , toe of slope apron and deep shelf . Based on the analysis of the deposition process obtained 3 cycles of sedimentation that occurred from Wainukendi Formation . From the results of this analysis are used in determining the stratigraphic sequence to obtain stacking patterns that evolve based sequence boundary and its systems tract is composed of LST - TS - MFS - TST - HST so that obtain a full cycle changes in accommodation space and sediment supply where there is an increase in accommodation space which was offset by an increase in the supply of sediment in LST phase is characterized by progradation and agradation, an increase in the supply of sediment is lower than the increase in accomodation space in TST phase is characterized by retrogradation, and lastly, a decrease in accommodation space while sediment supply rate is still high in HST phase characterized by progradation.
Characteristics of the Triassic Source Rocks of the Aitutu Formation in the (West) Timor Basin Permana, Asep Kurnia; Kusworo, Aries; Prastian, Andi Heri
Indonesian Journal on Geoscience Vol 1, No 3 (2014)
Publisher : Geological Agency

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DOI:10.17014/ijog.v1i3.192The Triassic rocks of the (West) Timor Basin have been identified that was mainly deposited in the  marine environment. The fine grained clastics and carbonate  rocks of this Triassic marine  facies are considered to be the most promising source rocks potential in this basin. In this paper we present geochemical and petrographic data from outcrop samples of the Triassic carbonate Aitutu Formation, due to emphasized the organic maturation, kerogen type of the organic matter and the origin of the organic matter.  A representative of selected sample were subjected to the Rock-Eval Pyrolisis, vitrinite reflectance and thermal alteration index, bitumen extraction, were analyzed on the GC-MS. The samples were collected from marine deposit of the Triassic Sequence. The TOC values of the analyzed sample range between rich and rich organic richness (0.51% - 9.16%, wt.%, TOC), which consists mainly of type II and III kerogen and the organic matter consider to be predominantly oil/gas prone and gas prone potential. The thermal maturity assessed from Tmax, TAI, and vitrinite reflectance shows an immature to early peak mature stage of the organic matter. The GC-MS analyses of the biomarkers indicate mainly the organic matter derived from mixed source rocks facies containing alga debris and higher plant terrestrial origin.
Aplikasi Petrologi Organik Dalam Analisis Cekungan dan Eksplorasi Hidrokarbon pada Beberapa Cekungan di Indonesia dan Australia Permana, Asep Kurnia
Jurnal Geologi dan Sumberdaya Mineral Vol 18, No 3 (2017): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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

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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
MIKROFASIES DAN DIAGENESIS BATUGAMPING BERDASARKAN DATA PETROGRAFI PADA FORMASI NAKFUNU DI DAERAH TIMOR TENGAH SELATAN Maryanto, Sigit; Permana, Asep Kurnia
Jurnal Geologi dan Sumberdaya Mineral Vol 23, No 3 (2013): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Microfacies and diagenesis of limestones from the Nakfunu Formation have been studied to tracing the depositional mechanism and post depositional geological histories of the rocks. Limestone samples randomly taken from the field on the Cretaceous rock formation, for petrographic analysis. Petrogrtaphic analysis of the fourty two limestone samples showing that the type of the limestones are packstone, wackestone, and mudstone. The depositional environments of this formation are include basin margin, open sea shelf near the lower slope, and deep sea basin with slow sedimentation. The limestones have affected by various kinds of diagenetic proccesses post-sedimentation. The diagenetic procceses recorded under the polarization microscope as: cementation, replacement, silicification, recrystallization, dolomitization, compaction, fracturing, and dissolution.Keywords: Cretaceous, limestone, petrography, microfacies, diagenesis.
CLEAT CHARACTERISTICS IN TERTIARY COAL OF THE MUARAENIM FORMATION, BANGKO AREA, SOUTH SUMATERA BASIN: Implications for Coalbed Gas Potential Permana, Asep Kurnia; Panggabean, Hermes
Jurnal Geologi dan Sumberdaya Mineral Vol 21, No 5 (2011): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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

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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.
3-D Imaging of Cleat and Micro-cleat Characteristics, South Walker Creek Coals, Bowen Basin, Australia: Microfocus X-ray Computed Tomography Analysis Permana, Asep Kurnia
Indonesian Journal on Geoscience Vol 7, No 1 (2012)
Publisher : Geological Agency

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Abstract

DOI: 10.17014/ijog.v7i1.131The Permian coals of the South Walker Creek area have a moderately to highly developed cleat system. The cleat fractures are well developed in both bright and dull bands, and generally parallel, inclined or perpendicular to the bedding planes of the seam, with the spaces open or filled by mineral matter, such as clay and carbonate minerals. Microfocus X-ray computed tomography (CT) technique was performed to identify cleat characteristics in the coal seams. This technique allows visualizing of microcleat distribution and mineralization in three dimensional images. Cleat mineralization in the coal seam occurs either as single mineral (monomineralic) or intermixed mineral (polymineralic) masses. The cross cutting relationship was shown by X-ray CT scan analysis. The timing of microcleat formation in the coal seam from early to late is carbonate minerals, clay minerals (kaolinite) plus minor high density (rutile or anatase) phases. Thus, a high resolution of microfocus X-ray CT does not only provides a better visualization, but also could identify microcleat orientation, cleat mineralization, and generation of microcleat.
DEPOSITIONAL ENVIRONMENT OF THE SAROLANGUN COALS, SOUTH SUMATRA BASIN Permana, Asep Kurnia; Panggabean, Hermes
Jurnal Geologi dan Sumberdaya Mineral Vol 21, No 4 (2011): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

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