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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 getÂ 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

DOI:10.17014/ijog.v1i3.192The Triassic rocks of the (West) Timor Basin have been identified that was mainly deposited in theÂ marine environment. The fine grained clastics and carbonateÂ rocks of this Triassic marineÂ 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.Â 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.

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

DOI:Â 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 asÂ 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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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

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

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The world energy crisis has effected the Indonesian energy supply, inspite of 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. Keywords : coal characteristics, Sarolangun-Pauh Region, coalbed methane (CBM).

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.

SISTEM MINYAK DAN GAS DI CEKUNGAN TIMOR, NUSA TENGGARA TIMUR PETROLEUM SYSTEM IN THE TIMOR BASIN, NUSA TENGGARA TIMUR Koesnama, Koesnama; Permana, Asep Kurnia
Jurnal Geologi dan Sumberdaya Mineral Vol 16, No 1 (2015): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Bahasan sistem migas pada makalah ini dikhususkan pada pembicaraan mengenai keberadaan batuan induk, batuan waduk, batuan tudung atau penutup, serta perangkap hidrokarbon. Dikenal beberapa macam batuan induk di Cekungan Timor, yaitu serpih hitam dari Formasi Atahoc, Formasi Cribas, dan Formasi Wailuli. Analisis geokimia ataupun petrologi organik menunjukkan bahwa serpih hitam dari ketiga formasi tersebut masuk dalam klasifikasi sangat baik, dan merupakan kerogen tipe III. Berdasarkan analisis petrografi, SEM dan porositas maka yang berpeluang menjadi batuan waduk adalah batupasir dari Formasi Cribas, Formasi Babulu dan Formasi Oebaat, serta batugamping Formasi Aitutu. Sementara berdasar data petrografi dan SEM maka sepih Formasi Cribas dan Nakfunu berpotensi menjadi batuan penutup. Perangkap struktur yang berkembang adalah struktur bunga positif, antiklin landai, antiklin tersesar naikkan, dan graben. Sedangkan perangkap stratigrafi dapat berupa lensa-lensa batupasir dan lapisan batugamping.Kata kunci: Sistem migas, Cekungan Timor, batuan induk, batuan waduk, batuan penutup dan perangkap hidrokarbon.

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

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

Aspek Petrografi Batugamping di Daerah Timor Tengah Selatan Maryanto, Sigit; Permana, Asep Kurnia; Wahyudiono, Joko
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 2 (2018): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Microfacies and diagenetic aspects of limestones in the South Central Timor, East Nusa Tenggara have studied to investigate the deposition mechanism of the rocks and history of geological process after the rocks deposition. The cropped out of limestones in the research area includes into four rock units, are Aitutu Formation from Triassic, Nakfunu Formation from Early Cretaceous, Menu Formation from Late Cretaceous, and Ofu Formation from Paleogene. Limestone petrography analysis have been done on eighteen samples from the Aitutu Formation, fourty two samples from the Nakfunu Formation, nineteen samples from the Menu Formation, and seven samples from the Ofu Formation. Based on the study of limestones mikrofasies and diagenesis that has been done, proved are the fourth formation could be act as a source and reservoir for hydrocarbon. Keywords: Limestone, petrography, microfacies, diagenetic, hydrocarbon

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