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All Journal IJOG : Indonesian Journal on Geoscience Journal of Engineering and Technological Sciences Jurnal Ilmu Kebumian Teknologi Mineral (JIK TekMin) Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Jurnal GEOSAPTA Prosiding Temu Profesi Tahunan PERHAPI INDONESIAN MINING PROFESSIONALS JOURNAL Indonesian Journal on Geoscience Indonesian Journal on Geoscience Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)

Agus Haris Widayat

Earth Resource Research Group, Faculty Of Mining And Petroleum Engineering, Institut Teknologi Bandung,

Author-ID : 415184

Aerospace Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Energy Engineering Environmental Science

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STUDI KARAKTERISTIK BEBERAPA BATUBARA INDONESIA UNTUK MENDUKUNG PROSPEK PEMANFAATANYA Suhat, Boas; Widayat, Agus Haris; Anggayana, Komang
Prosiding Temu Profesi Tahunan PERHAPI 2020: PROSIDING TEMU PROFESI TAHUNAN PERHAPI
Publisher : PERHAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36986/ptptp.v0i0.133

Batubara merupakan hasil tambang yang memiliki beragam manfaat. Pada umumnya, batubara di Indonesia dimanfaatkan sebagai bahan bakar yang biasa disebut batubara uap atau sebagai bahan baku industri baja yang biasa disebut batubara kokas. Baik batubara uap maupun batubara kokas memiliki spesifikasi kualitas yang berbeda satu sama lainnya sesuai dengan kebutuhan dari proses pemanfaatanya masing-masing. Agar batubara dapat dimanfaatkan sesuai dengan kualitasnya, perlu dilakukan pengujian kualitas terhadap sampel-sampel batubara. Pada penelitian ini dipilih contoh batubara yang berasal dari beberapa formasi geologi pembawa batubara, yaitu Formasi Batu Ayau dan Formasi Tanjung di Cekungan Barito, Formasi Balikpapan di Cekungan Kutai, dan Formasi Muara Enim di Cekungan Sumatera Selatan. Pengujian yang dilakukan meliputi pengujian proksimat, pengujian ultimat, pengukuran nilai kalori, dan pengujian FSI (Free Swelling Index). Hasil dari pengujian-pengujian tersebut akan mencerminkan proses pembatubaraan yang telah dialami oleh batubara. Batubara yang telah mengalami pembatubaraan hingga peringkat Subbituminus dengan tipikal Gross Calorific Value di kisaran 5000 kcal/kg (ar), kandungan air di bawah 36 % (ar), kandungan abu di bawah 15% (adb), kandungan zat terbang di kisaran 40% (adb), dan kandungan sulfur di bawah 0,9% (adb) lebih cocok untuk dimanfaatkan sebagai batubara uap. Sedangkan batubara yang telah mengalami pembatubaraan hingga peringkat bituminus dengan tipikal kandungan air di bawah 15% (ar), kandungan abu di bawah 12% (adb), kandungan belerang di bawah 1% (adb), dan FSI di atas 6 lebih cocok untuk dijadikan batubara kokas.

Depositional Environment of the Sangkarewang Oil Shale, Ombilin Basin, Indonesia Komang Anggayana; Agus Haris Widayat; Sri Widodo
Journal of Engineering and Technological Sciences Vol. 46 No. 4 (2014)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2014.46.4.6

Five samples from 56 m long drill core of lacustrine Sangkarewang oil shale have been studied by means of petrography and organic geochemistry to investigate the organic matter composition and depositional environments of the shale. The organic matter consists of abundant lamalginite (30%, v/v) and very limited amount of vitrinite, suggesting aquatic depositional environments with minor terrestrial influence. Organic geochemical analysis exhibits the dominance of pristane, phytane, and generally n-alkanes compounds. These compounds might originate mostly from aquatic photosynthetic organisms. The oil shale was likely deposited in anoxic lake environments, suggested by the presence of framboidal pyrite (6%, v/v) and preserved organic matter with total organic carbon (TOC) about 4.9%. The pristane/phytane ratio is relatively high about 3.9 and thought as source sensitive rather than redox sensitive. Hopanoid and aryl isoprenoid compounds are present in minor amounts. The latter compounds are interpreted to be derived from green sulfur bacteria dwelling in anoxic and the presence of H2S in bottom water.

Depositional Cycles of Muara Wahau Coals, Kutai Basin, East Kalimantan Komang Anggayana; Basuki Rahmad; Agus Haris Widayat
Indonesian Journal on Geoscience Vol 1, No 2 (2014)
Publisher : Geological Agency

http://dx.doi.org/10.17014/ijog.v1i2.183Fifteen samples were taken ply by ply from a 33 m thick drill core of Muara Wahau coal seams for interpretation of depositional environments. Generally, lithotype variation in the bottom part of the coal seams has a lower frequency than in the upper part. Petrographical analysis was performed to determine the maceral composition, groundwater index (GWI), and gelification index (GI). The samples from lower sections show much higher GWI-GI values and lower variation frequency than from the upper section. This characteristic is interpreted as the result of development of mesotrophic to ombrotrophic peats during the deposition of lower to upper parts of the section, respectively. During the development of the mesotrophic peat, water was more abundant and relatively stable in budget. However, during the development of ombrotrophic peat, water was less abundant and relatively not stable in budget. The latter is related to the water supply depending only on rain, resulted in the more sensitive water table in the om- brotrophic peat. The unstable water table is thought as the reason of higher variation frequency of lithotype, GWI, GI, as well as maceral composition in the upper part of the core. Unstable water table would lead to moist condition in the uppermost layer of the ombrotrophic peat, favoring fungi to grow. This is confirmed by the higher abundance of sclerotinite maceral in samples from the upper part of the coal core.

Precipitation of Calcite during the Deposition of Paleogene Sangkarewang Oil Shale, Ombilin Basin, West Sumatra, Indonesia Agus Haris Widayat; Komang Anggayana; Isra Khoiri
Indonesian Journal on Geoscience Vol 2, No 3 (2015)
Publisher : Geological Agency

DOI: 10.17014/ijog.2.3.185-197Geochemical and petrographical analyses were carried out to investigate the occurrence of calcite in theformer Ombilin lacustrine lake. The study involves eight samples taken from a 56 m long drill core of Sangkarewangoil shale. Geochemical investigation showed that the samples consist of varied terrigenous input represented by Si, Al, K, and Ti, and autochthonous input represented by S, total organic carbon (TOC), and d13C of bulk organic matter. Along the drill core profile the abundance of autochthonous input decreases upwards, while that of terrigenous input oppositely increases upwards. Petrographical analysis revealed that calcite is a major mineral in the samples. In this study, the abundance of calcite could be represented by the abundance of Ca, as calcite is the only significant Ca containing mineral. Ca is abundant in the samples (8.4% in average) and its concentration varies similarly with those of S, TOC, and d13C, suggesting that the element as well as calcite incorporates the autochthonous input. Thevariation of calcite abundance in the drill core profile is considered to be related with primary productivity changes during the development of the former lake. Higher primary productivity represented by more positive of d13C value(-24.8‰) during the deposition of the lower part of the drill core profile promoted the higher amount of deposited organic matter. In such environment, the supersaturation of carbonate ion in lake water was also reached and significant precipitation of authigenic calcite occurred. As the lake developed, the primary productivity decreased as indicated by more negative of d13C value (eventually -26.8‰). This condition led to the decreases of deposited organic matterand calcite in the lake sediments.

Wireline Log Responses, Mudweight, Clay Mineralogy, and Implied Overpressure Condition: Insights from Aru Field, North Sumatra Basin Mohammad Syaiful; Lambok M. Hutasoit; Agus M. Ramdhan; Agus Haris Widayat
Indonesian Journal on Geoscience Vol 7, No 2 (2020)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.7.2.105-119

DOI:10.17014/ijog.7.2.105-119This paper comprehensively discusses overpressuring in the North Sumatra Basin by using wireline log, drilling events and parameters, and clay mineralogical data. It shows an interesting phenomenon related to overpressuring in this basin, i.e. strong log reversals indicating high overpressure, yet the mudweight used during drilling was relatively low, indicating low overpressure with no significant drilling events noted in the final well report.The result of the study shows that wireline log is the best parameter to imply overpressure magnitude. Regarding low mudweight in the strong log reversal zone, it would be elucidated that the drilling in that zone was in underbalance condition with respect to shale pressure, but not to sandstone pressure. The sandstone pressure is interpreted to be lower than shale pressure due to lateral drainage process. By applying the Eaton’s method, the estimated maximum overpressure magnitude in the Baong Formation is in the range of 1,594 - 3,185 psi. or equivalent to the mudweight of 1.61 - 192 g/cm3. The analysis of wireline log in combination with clay mineralogical data shows that there are two compaction lines in the studied area, i.e. smectitic and illitic compaction lines. The cross-plot of density and sonic logs in shale section suggest that the cause of overpressure was loading mechanism. The scanning electron microscope (SEM) image confirms that in overpressure zone, grain to grain contact is still able to be observed fairly well, inferring that loading mechanism is really the cause of overpressure in the studied area.

The Occurrence and Genesis of Silicified Coals in Tanjung Redeb, Embalut, and Loa Kulu, East Kalimantan, Indonesia Agus Haris Widayat; Komang Anggayana; Teti Indriati; Andy Yahya Al Hakim; Mulyono Dwiantoro; Miqdam Furqany; Mirza Dian Rifaldi
Indonesian Journal on Geoscience Vol 9, No 1 (2022)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.9.1.27-43

DOI:10.17014/ijog.9.1.27-43The occurrence and genesis of silicified coals in Tanjung Redeb, Embalut, and Loa Kulu have been described and reconstructed by means of petrography and geochemistry. The silicified coals are black, hard, and contain dispersed fine-grained silica minerals. Silica (SiO2) contents vary from 58 to 76%, and LOI (mostly represents organic matter) ranges from 23 to 40% of the bulk silicified coal samples based on the ICP-INAA analysis. Microscopic examination shows the presence of quartz, chalcedony, and amorphous opal. Silicification occurs both as layers and nodules within the coal seams. The layer type is usually thin layers (<25 cm) near the top and bottom of the seams, and they can spread horizontally up to 3 m. Nodules occur randomly in the coal seams having a diameter from several centimeters to 1 m. Further microscopic investigation shows that preserved cellular structure is more commonly observed in the layered silicified coal samples. This may suggest that the layered silicification occurred relatively early in the coal seam diagenesis, while the nodule silicification took place during later diagenesis. The coexistence of silica polymorphs in some samples may indicate the presence of multiple silicification stages during coalification.

Identifikasi Biomarker Fraksi Aromatik Batubara Muara Wahau, Kalimantan Timur 2016 Basuki Rahmad; Komang Anggayana; Sri Widodo; Agus Haris Widayat
Jurnal Ilmu Kebumian Teknologi Mineral (JIK TekMin) Vol 1, No 2 (2015)
Publisher : Fakultas Teknologi Mineral

Show Abstract | Download Original | Original Source | Check in Google Scholar

The research location in Wahau Muara District, East Kutai Regency, East Kalimantan Province. Geological setting of Muara Wahau located in the Kutai Basin Upper included in the Early Miocene Formations Wahau. Coal of Muara Wahau has a unique characteristic that inertinite abundant content with an average value of 20.1% with a low maturity (immature) with Rv (random) 0.40 to 0.44 including lignite rank.Coal samples taken from Seam-1 directly from drill core which drill hole GT-02. Intake of sample done by coring method with the preparation ply by ply based on lithotype appearance. Laboratory analysis of coal samples for organic geochemical analyzes conducted by Soxhlet extraction and then using column chromatography to obtain aromatic fractions.Picene derivatives such as 1,2,4a, 9-tetramethyl-1,2,3,4,4a, 5,6,14b-octahydropicene dominate with the highest concentration of 6509 mg / g TOC than other pentacyclic compounds in the aromatic hydrocarbon fraction Muara Wahau coal.The presence amyrin resulting from microbial degradation or the result of oxidative degradation in tropical climates and several derivatives amyrin typical of Muara Wahau coal one of which is a non-aromatic fraction hopanoid pentacyclic triterpenoids (picene) indicating Angiosperm plant origin. Picene presence implies that the formation of Muara Wahau coal still in the initial transformation during the first stage of diagenesis (early diagenetic) with the maturity level is low (immature). Keywords: picene; amyrin; oxidative degradation; tropis; angiosperm; immature. ABSTRAKLokasi penelitian terletak di Kecamatan Muara Wahau, Kabupaten Kutai Timur, Propinsi Kalimantan Timur. Tatanan geologi daerah Muara Wahau berada di Cekungan Kutai Bagian Atas termasuk dalam Formasi Wahau berumur Miosen Awal. Batubara Muara Wahau memiliki keunikan yang khas yaitu kandungan inertinite yang berlimpah dengan nilai rata-rata 20,1% dengan kematangan yang rendah (immature) dengan Rv (random) 0,40-0,44 termasuk peringkat lignite.Conto batubara diambil dari Seam-1 langsung dari inti bor yaitu lubang bor GT-02. Pengambilan conto dilakukan dengan metode coring dengan preparasi ply by ply berdasarkan kenampakan lithotype. Analisa laboratorium conto batubara untuk analisis geokimia organik dilakukan dengan cara ekstraksi soxhlet kemudian menggunakan column chromatography untuk memperoleh fraksi aromatik.Turunan picene seperti 1,2,4a,9-tetramethyl-1,2,3,4,4a,5,6,14b-octahydropicene mendominasi dengan konsentrasi paling tinggi 6509 µg/g TOC dibanding senyawa-senyawa pentasiklik lainnya dalam fraksi hidrokarbon aromatik batubara Muara Wahau.Kehadiran amyrin yang dihasilkan dari microbial degradation atau akibat dari oxidative degradation di iklim tropis dan beberapa turunan amyrin yang khas dari batubara Muara Wahau salah satunya adalah fraksi aromatik non-hopanoid pentacyclic triterpenoid (picene) yang mengindikasikan tumbuhan asal angiosperm. Kehadiran picene mengimplikasikan bahwa pembentukan batubara Muara Wahau masih dalam transformasi awal selama tahap pertama diagenesis (early diagenetic) dengan tingkat kematangan yang masih rendah (immature). Kata kunci: picene; amyrin; oxidative degradation; tropis; angiosperm; immature.

ESTIMASI SUMBERDAYA BATUBARA DENGAN DATA GEOMETRI DAN KUALITAS YANG TIDAK STASIONER: STUDI KASUS BATUBARA FORMASI BALIKPAPAN Andrew Harryanto Sinaga; Mohamad Nur Heriawan; Agus Haris Widayat
Prosiding Temu Profesi Tahunan PERHAPI 2018: Prosiding Temu Profesi Tahunan PERHAPI
Publisher : PERHAPI

Endapan batubara memiliki karakteristik berupa kontinuitas spasial yang relatif homogen mengikuti bidang perlapisannya. Karakteristik spasial dari kualitas dan kuantitas seam batubara tersebut dapat diolah berdasarkan data sebaran titik bor. Jika seam batubara memiliki karakteristik kualitas dan kuantitas yang relatif homogen secara spasial maka data disebut stasioner. Namun dalam beberapa kasus data kualitas dan kuantitas seam batubara terkadang memiliki pola yang tidak homogen melainkan memiliki trend tertentu yaitu nilai data cenderung naik atau turun ke arah tertentu secara spasial yang membuatnya menjadi tidak stasioner. Hal tersebut terjadi karena pengaruh faktor geologi tertentu pada saat atau setelah proses pengendapannya. Dalam penelitian ini dibahas mengenai solusi untuk estimasi sumberdaya batubara pada data kualitas dan kuantitas yang tidak stasioner dengan cara mengelompokkan data sebaran titik bor menjadi beberapa bagian secara spasial untuk mengurangi pengaruh trend tersebut. Estimasi sumberdaya batubara dilakukan dengan 2 (dua) pendekatan geostatistik yaitu Ordinary Kriging (OK) dan Kriging with Trend (KT) baik pada seluruh data maupun pada data yang telah dikelompokkan. Hasil estimasi menunjukkan bahwa relative error yang diperoleh, baik dengan OK maupun KT berbeda pada setiap kelompok data. Pendekatan yang memberikan relative error paling kecil akan direkomendasikan untuk estimasi sumberdaya pada data kualitas dan kuantitas batubara yang tidak stationer. Studi kasus yang digunakan dalam penelitian ini adalah salah satu seam batubara di Formasi Balikpapan untuk data ketebalan dan sulfur total.

PENGARUH KOMPOSISI MASERAL BATUBARA MUARA WAHAU TERHADAP PERILAKU TERMAL MENGGUNAKAN PENDEKATAN PIROLISIS DENGAN THERMOGRAVIMETRIC ANALYSIS (TGA) Agus Haris Widayat; Komang Anggayana; Basuki Rahmad; Luthfi Hafizh Azhar
Indonesian Mining Professionals Journal Vol 2, No 2 (2020): November
Publisher : PERHAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36986/impj.v2i2.33

Empat conto batubara dari daerah Muara Wahau telah diteliti untuk mengetahui karakteristik termal dengan pendekatan analisis pirolisis dan perangkat thermogravimetric analysis (TGA). Perilaku termal ini dapat memberikan gambaran yang dialami oleh batubara selama proses pembatubaraan di alam, pembatubaraan buatan, salah satu proses yang terjadi pada gasifikasi batubara bawah tanah, pencairan batubara, dan lain-lain. Analisis proksimat, ultimat, dan petrografi batubara juga dilakukan untuk mengetahui komposisi bahan organik yang terkandung di dalamnya. Hasil analisis menunjukkan bahwa batubara Muara Wahau mempunyai komposisi maseral inertinit yang cukup bervariasi dari 6% hingga 18% (v/v). Analisis TGA menunjukkan bahwa semakin tinggi kandungan maseral inertinit, penurunan massa conto secara umum semakin rendah. Hal ini menunjukkan bahwa maseral inertinit cenderung tidak berevolusi selama proses pemanasan. Hasil ini memberikan implikasi bahwa batubara yang mengandung maseral inertinit kurang direkomendasikan untuk jenis pemanfaatan yang dipengaruhi oleh reaktivitas maseral seperti gasifikasi dan pencairan.

Methane Adsorption Characteristics of coals from Sambaliung area,Berau, East Kalimantan and Sawahlunto area, West Sumatra, Indonesia Komang Anggayana; Denny Reza Kamarullah; Asep Suryana; Agus Haris Widayat
Jurnal Geologi dan Sumberdaya Mineral Vol. 18 No. 4 (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.v18i4.333

Investigation of methane adsorption capacity has been performed in Sambaliung Area, Berau, East Kalimantan (Latih Formation) and Sawahlunto Area, West Sumatra (Sawahlunto Formation). The study involves some analyses: methane sorption, petrography, and proximate. Adsorption isotherm analysis reveals storage capacity of Sambaliung and Sawahlunto coals about 113 to 269 scf/ton (daf) and from 486 to 561 scf/ton (daf), respectively. The adsorption capacity of the coals is thought to be related with formation pressure represented by depth as well as coal rank. The Sambaliung coal rank is low as indicated by the lower vitrinite reflectance (Rr about 0.38%) and higher total moisture (TM about 31%, ar). The Sawahlunto coal rank is higher as indicated by higher Rr (about 0.72%) and lower TM (about 6%, ar).

Co-Authors Agus M. Ramdhan Andi Zulkarnain, Andi Andrew Harryanto Sinaga Andy Yahya Al Hakim Asep Suryana Basuki Rahmad Basuki Rahmad BASUKI RAHMAD Basuki Rahmad Budi Sulistijo Denny Reza Kamarullah Denny Reza Kamarullah, Denny Reza Hakim, Andy Yahya Al Heriawan, Mohamad Nur Hutasoit, Lambok M. Indriati, Teti Isra Khoiri Isra Khoiri, Isra Khoiri, Isra Komang Anggayana Komang Anggayana Komang Anggayana Komang Anggayana Lambok M. Hutasoit Luthfi Hafizh Azhar Miqdam Furqany Mirza Dian Rifaldi Mohamad Nur Heriawan Mohammad Syaiful Mulyono Dwiantoro Putra, Jovian Addo Ramdhan, Agus M. Solly Aryza Sri Widodo Suhat, Boas Syafrizal Syafrizal Syaiful, Mohammad Teti Indriati

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