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All Journal Bulletin of Scientific Contribution : Geology IJOG : Indonesian Journal on Geoscience Buletin Sumber Daya Geologi Indonesian Journal on Geoscience Indonesian Journal on Geoscience Jurnal Geominerba Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Journal of Geosciences and Applied Geology LEMBARAN PUBLIKASI MINYAK DAN GAS BUMI
Ahmad Helman Hamdani
Fakultas Teknik Geologi, Universitas Padjadjaran
Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Energy Engineering Environmental Science Other

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The Face Mask Waste Recycling Generated During Covid-19 Pandemic In Indonesia Hamdani, Ahmad Helman; Haryanto, Agus Didit
Journal of Geological Sciences and Applied Geology Vol 5, No 2 (2021): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v5i2.34996

Abstract

In Indonesia, the COVID-19 disease has developed rapidly as found on April 20, 2021, there were 1,614,849 positive cases of Covid-19. The increase in cases of the coronavirus has resulted in an increase in the amount of medical waste during the Covid-19. The most common medical waste is face masks, both from hospitals and households. This increase in medical waste will cause environmental damage or health problems.  "A viable solution for reducing the impact of face mask waste on health and the environment is to recycle the face mask mechanically, chemically, and thermally. The proximate, ultimate, FTIR analysis and hardness testing have been carried out to obtain the potential for recycled products. The test results show that carbon ( C ) and volatile matter  (VM)are found in large quantities; polypropylene content is a detected type of plastic. Thus, recycled products can generate potential as a source of renewable energy, cement replacement materials, pipes, packaging materials.. Besides being able to produce new products, this process can also eliminate viruses.
RELATIONSHIP BETWEEN MOLECULE STRUCTURE AND COAL MATURITY OF BAYAH FORMATION BASED ON X-RAY DIFFRACTION ANALYSIS Ardiansyah, Muhammad Iqbal; Hamdani, Ahmad Helman; Haryanto, Agus Didit
Journal of Geological Sciences and Applied Geology Vol 5, No 3 (2021): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v5i3.38349

Abstract

Coal is the richest source of energy used worldwide. Characterization of the structure of coal is one of the important things in studying the use of coal. X-Ray Diffraction (XRD) has been successfully used as a tool to study the molecular structure characteristics of coal with various coal ranks. There are five coal samples to be examined from the Bayah Formation in Lebak Regency, Banten. This study aims to measure the crystal structure parameters in coal and use them to predict coal maturity level. The results of XRD analysis showed that the five coal samples had the same crystal structure characteristics. The value of d002 is in the range of 3.87 to 3.96 Å, indicating that the studied sample has a low content of microcrystalline units. The measurement of carbon aromaticity (fa) values in the study area ranged from 0.67 to 0.76. There is a strong correlation between the value of coal maturity as measured by vitrinite reflectance (Ro) and the value of aromaticity; which is characterized by a correlation value of r of 0.88. Thus, the aromaticity (fa) value of XRD can be used to predict the maturity level of coal.
Evaluation of Acid-Base Accounting to Predict the Acid Water of Overburden in Coal Mines in Horna Areas, West Papua Province, Indonesia Hamdani, Ahmad Helman; Hutabarat, Johanes; Haryanto, Iyan; Ilmi, Nisa Nurul
Journal of Geological Sciences and Applied Geology Vol 2, No 3 (2017): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v2i3.15618

Abstract

Acid-Base Accounting (ABA) is an analytical procedure to measure the balance between the acid neutralization and acid generation properties of any geologic material. ABA is considered tools  to predict post-mining water. Overburden samples were collected from the coalfields of Horna coalmines. Maximum potential acidity (MPA), acid neutralizing capacity (ANC), acid net neutralization potential (ANG), Net Acid Producing Potential  (NAPP), net acid generation (NAG), and ANC/MPA ratios were determined for each site based on ABA.  Most of the sample from R1, R4, R-13, and R14 showing the pH of net acid generation of overburden ranges from 3.2 – 4.47 and positively acid net neutralization potential (be classified as the PAF-LC (Low Capacity Potential Acid NAPP) varies from 2.07 – 21.27 2.4 kg/t H2SO4   indicate that the samples are classified as the PAF-LC (Low Capacity Potential Acid Former (LC-PAF) to the PAF-MC (Moderately Capacity Potential Acid Former (MC-PAF). Other samples from R13 (four samples) has negatively NAPP and pHNAG between 6,21 – 7,10, therefore should be classified as the NAF; two samples from R13 indicated the uncertainty (UC) due to high pHNGA (6,82-7,15).
Origin of Oil Seeps in West Sulawesi Onshore, Indonesia: Geochemical Constraints and Paleogeographic Reconstruction of the Source Facies Sutadiwiria, Yarra; Yeftamikha, .; Hamdani, Ahmad Helman; Andriana, Yoga; Haryanto, Iyan; Sunardi, Edy
Journal of Geological Sciences and Applied Geology Vol 2, No 1 (2017): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v2i1.13420

Abstract

ABSTRACTNumerous oil and gas seeps occur at onshore West and South Sulawesi. These may indicate the presence of active petroleum system in subsurface hence the area is worthy for further exploration. No discovery well so far in this area. Therefore, the seeps provide significant data to build integrated petroleum system analysis.A number of geochemical analysis were conducted on the oil seeps and rock samples from outcrop and well cuttings to reveal the source rocks that generate the oils. Triterpane m/z 191 shows low content of tricyclic terpane, low norhopane to hopane, and abundant oleanane. Sterane m/z 217 and bicyclic alkane m/z 123 show dominant C29 sterane and bicadinane. These biomarkers indicate that the source of oils are coals and/or coaly shales deposited in fluvio-deltaic setting. Contribution from marine input is shown in Karama region to the south.Based on stratigraphic setting of West and South Sulawesi, the best candidate for the source of oil seeps is Eocene coals or coaly shales of Toraja or Kalumpang Formation. The Eocene coal samples have been characterized and show similar GC alkane distribution with the oil seeps. Contribution from marine facies, which may age-equivalent to these coals are shown in Karama region.Aromatic methyl phenanthrene m/z 178 and m/z 192 were also analyzed to know their maturities and they were generated at maturity level equivalent with Ro 0.8-1.0 %.Based on geochemical constraints and geologic data, a paleogeographic setting of Eocene Toraja/Kalumpang Formation was built to know better about the paleo-source facies of the oils and its geochemical characteristics. Keywords: Biomarker, coaly shales, Toraja/Kalumpang Formation
THE SUSTAINABLE MANAGEMENT OF POST-MINING LANDUSE; AN AHP APPROACH A CASE STUDY: EX-SAND MINING IN INDRAMAYU REGENCY, WEST JAVA Hamdani, Ahmad Helman; Hutabarat, Johanes; Muhamadsyah, Faisal
Journal of Geological Sciences and Applied Geology Vol 4, No 3 (2021): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v4i3.32224

Abstract

Recently, the sustainable management of post-mining land use has received great attention. The mining-closure, due to the mine has no longer economic value, or the mined material has run out; often leaving poor landscapes and degraded land.  The mining company have to rehabilitate the ex-mining land so that it can be returned to its original baseline stage or can be used for other more useful activities. The objective of research is to arrange the sustainable management plan of post-mining land use at ex sand-mining in Indramayu Regency, West Java. The Analytical Hierarchy Process (AHP) approach used to determine the priority of activities that will be carried out on the land. Several criteria and alternative were calculated by Saaty’s AHP pairwise comparison scale.  The research results reveal that in post mining land use management based on sustainable management, economic criteria must be considered first, followed by environmental, socio-culture and finally technical criteria. Fishery, cattle breeding and agriculture were found to be the optimal alternative for sand post‐mining land use.
STUDI KARAKTERISTIK DAN PERMODELAN TERMAL BATUAN INDUK TERSIER DI CEKUNGAN SALAWATI, PAPUA BARAT Arista Muhartanto; Ahmad Helman Hamdani Hamdani; Safrizal; Lili Fauzielly; Afriadhi Triwerdhana
Lembaran Publikasi Minyak dan Gas Bumi Vol. 52 No. 3 (2018): LPMGB
Publisher : BBPMGB LEMIGAS

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

Abstract

Cekungan Salawati memiliki cadangan minyak dan gas sejumlah 0.5 BBO dan 0.1 TCFG, diduga hidrokarbon dihasilkan dari batuan induk Tersier dan Pra-Tersier. Beberapa studi batuan induk telah dilakukan, seperti pada Formasi Sirga (Oligosen Akhir), Formasi Kais (Miosen Tengah) dan Formasi Klasafet (Miosen Akhir). Minimnya pengetahuan mengenai studi karakteristik dan pemodelan termal batuan induk Formasi Sirga dan Pre-Faumai, serta keingintahuan mengamati adanya pembalikan polaritas cekungan merupakan hal yang menarik untuk diteliti lebih lanjut. Metode penelitian menggunakan analisis geokimia petroleum yang meliputi: TOC, Rock Eval Pyrolisis, kerogen typing, vitrinite reflectance (%Ro ) dengan sejumlah 9 sampel cuttings. Kekayaan material organik berdasarkan parameter TOC pada kedua formasi menunjukkan kuantitas good to very good, sedangkan parameter PY menunjukkan kualitas fair to good potency sebagai batuan induk dalam menggenerasikan hidrokarbon. Tipe kerogen komposisinya didominasi NFA yang mengindikasikan pengendapan di lingkungan oxidizing marine atau lakustrin. Data plot HI terhadap Tmax, kerogennya menunjukkan campuran tipe II/III yang mengindikasikan pengendapan yang terjadi di lingkungan transisi (fl uvio-deltaic). Kematangan Formasi Sirga dan Pre-Faumai (Oligosen) berdasarkan %Ro dan Tmax menunjukkan tingkat yang rendah. Data kematangan berdasarkan pemodelan cekungan 1D pada sumur Warir-1X dan WIR-1A (di luar daerah penelitian) memperlihatkan evolusi kematangan yang telah mencapai level yang lebih tinggi, yakni early to mid-mature yang terjadi pada kala Pliosen Tengah, dan tingkat kematangan akhir dalam oil generation yang tercapai sejak Pleistosen Awal. Adanya pembalikan polaritas cekungan yang mengarah ke Selatan sebelum Pliosen, berubah menjadi mengarah ke Utara sebagai deposenter cekungan berdampak terhadap peningkatan kematangan termal. Pada deposenter, umumnya bertindak sebagai dapur yang matang (mature kitchen) yang merupakan tempat dihasilkannya hidrokarbon.
GEOKIMIA BATUAN PENUTUP (OVERBURDEN) BATUBARA UNTUK MEMPREDIKSI POTENSI AIR ASAM TAMBANG DI PIT 1 IUP PWR, DI DAERAH KASAI, KABUPATEN BERAU, KALIMANTAN TIMUR -, Ahmad Helman Hamdani; -, Yoga Adriana Senjaya
Bulletin of Scientific Contribution Vol 9, No 2 (2011): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1190.205 KB) | DOI: 10.24198/bsc.v9i2.8265

Abstract

Geochemical studies of cap rock (overburden) on coal mining can be used as an indicator to predict the potential of acid mine drainage (AMD) not from coal itself. Coal overburden at PIT 1 IUP PWR, East Kalimantan composed by clay rocks. Geochemical measurements whic is carried from overburden samples KSD11 and KSD11H; shows that the overburden-based reference SNI 6597-2011 can be categorized as rock Type 1. Plotting on curve grouping PAF / NAF based on the relationship between pH and PAN PPAN KSD11dan KSD11H site shows all samples including NAF group. Analysis of TCLP (toxicity characteristic leaching procedure) showed that low dissolved ferrous metals (0.6 g / L) while the metal content of calcium and magnesium respectively are 0.23 g / L and 0.47 g / L (Table 4.7). When the calculated total of mole equivalents , calcium and magnesium is greater than the iron dissolved, so that although the acid formed will be neutralized. Thus overburden in Likasi PIT 1 is a type of cap rock that not form acid mine drainage when exposed in water and air, so it does not require special handling to prevent the formation of acid mine drainage
STRATIGRAFI BATUAN DAERAH SELAJAMBE DAN SEKITARNYA, KECAMATAN SELAJAMBE, KABUPATEN KUNINGAN PROPINSI JAWA BARAT -, Abbas; Hamdani, Ahmad Helman; Muhamadsyah, Faizal
Bulletin of Scientific Contribution Vol 13, No 1 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1104.782 KB) | DOI: 10.24198/bsc.v13i1.8383

Abstract

Geographically, the research area is located at 108° 27' 7.3548" BT - 108° 32' 7.3572" BT and 07° 0' 9.6336" - 07° 5' 9.6324" LS. Administratively belongs to Selajambe District, Kuningan Regency, West Java. Based on the lithostatigraphy aspect, the research area is divided into four units which are (from the oldest) : Sandstone Unit (Tmbp), Monomic Breccia Unit (Tmbx), Volcanic Breccia Unit (Qbv) and Tuff Unit (Qt).Geological history of the region began at Middle Miocene, research area was deep sea environment, submarine fan depositional system due to turbidite mechanism, to formed sandstone unit (Tmbp). With increasing sediment supply without the accommodation space inadequate to sediment were prograding and made closer the source area, following by sedimentation of rough material to form the monomic breccia unit (Tmbx). At Miocene -Pliocene periods there was an increase of tectonic activity that caused the rocks to folded, jointed and faulted. During the Pleistocene, area of research has become the terrestrial environment and in that time volcanism was occured to formed the volcanic breccia unit (Qbv) and are conformably overlain by tuff unit (Qt) at the top.
POTENSI PENGEMBANGAN GASIFIKASI BATUBARA BAWAH PERMUKAAN DI DAERAH ASAM-ASAM, KABUPATEN TANAH LAUT, KALIMANTAN SELATAN: DEVELOPMENT POTENTIAL OF UNDERGROUND COAL GASIFICATION IN ASAM-ASAM AREA, TANAH LAUT REGENCY, SOUTH KALIMANTAN Muhammad Iqbal Ardiansyah; Ahmad Helman Hamdani; Nurdrajat
Buletin Sumber Daya Geologi Vol 20 No 3 (2025): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v20i3.539

Abstract

The potential of underground coal resources in Indonesia has not been fully exploited yet, necessitating new mining methods, one of which is underground coal gasification (UCG). The Asam-asam Basin is one of Indonesia's coal-producing basins that warrants further research regarding the potential development of UCG in the area. This study identifies the geological criteria of coal seams, such as seam thickness, depth, rank, seam dip, surrounding rock types, geological structure, and coal inventory located in the Asam-asam area.Data were collected through core drilling and well logging analysis at 4 boreholes (MIA004–MIA007). The results indicate that the area contains 9 coal seams: A, B, C, D, E, F, G, H, and I. Coal seam thickness varies from 0.49 meter to 18.95 meters, with surrounding rocks predominantly consisting of claystone, and some seams interbedded by sandstone and siltstone. The coal rank is primarily high volatile bituminous. Seams B, C, F, G, and H meet the coal inventory criteria. Evaluation using analytical hierarchy process (AHP) method indicates that Seam F has the highest potential for UCG development, with an average score of 0.78.
Penentuan Kualitas dan Lingkungan Pengendapan Batubara berdasarkan Nilai Total Abu, Total Air, dan Total Sulphur terhadap Nilai Kalori pada Batubara di Desa Batuah, Kecamatan Loa Janan, Kabupaten Kutai Kartanegara, Provinsi Kalimantan Timur Muhammad Afrizal Ie; Ahmad Helman Hamdani; Winantris Winantris
Jurnal Geologi dan Sumberdaya Mineral Vol. 27 No. 1 (2026)
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v27i1.1079

Abstract

Coal is formed from the accumulation of plant material that undergoes decomposition, compaction, and deposition over millions of years due to physical and chemical influences. This study was conducted in the Kampung Baru Formation, Kutai Basin, to determine quality and depositional environment of coal. Data were obtained from three boreholes (DH-01, DH-02, and DH-03) with having coal thicknesses of 17.8 m, 9.8 m, and 4.8 m, respectively. The analyses performed proximate and ultimate. The results showed that huminite (densinite) was the dominant maceral component with an average of 36.6%, followed by liptinit (cutinite) at 6.8% and inertinite (semifusinite) at 3.03%. The mineral matter content was dominated by pyrite (1.8–6.8%) and clay (0.8–7.6%). The average values of the proximate and ultimate analyses show an ash content of 20.60%, total water of 12.25%, total sulphur of 0.66%, and a calorific value of 4,042.3 cal/g. Based on the United Nations (1998) and ASTM classifications, coal in the study area is categorized as a lignite B to low-medium rank coal. Depositional environment analysis is based on Lamberson diagram classification (1991), which shows that the coal was deposited in a limno-telmatic zone with a lower to upper delta plain facies. Keywords: Coal, Kutai Basin, Kampung Baru Formation, Quality, Depositional Environment, Maceral  
Co-Authors Abbas - Adjat Sudradjat Adjat Sudradjat Afriadhi Triwerdhana Agus Didit Haryanto -, Agus Didit Haryanto Andriana, Yoga Ardiansyah, Muhammad Iqbal Arista Muhartanto Arista Muhartanto, Arista Chairul Nas Dandy, Leonardus Edy Sunardi Faizal Muhamadsyah, Faizal Irfan Marwanza Iyan Haryanto Johanes Hutabarat Khoirullah, Nur Lili Fauzielly Muhamadsyah, Faisal Muhammad Afrizal Ie Muhammad Iqbal Ardiansyah Nisa Nurul Ilmi Nurdrajat Nurdrajat Safrizal Safrizal Safrizal Sudradjat, Adjat Theresa Naomi Putri Triwerdhana, Afriadhi Winantris Winantris Yarra Sutadiwiria Yeftamikha Yeftamikha Yeftamikha, . Yeftamikha, Yeftamikha Yeftamikha, Yeftamikha Yoga Adriana Senjaya -, Yoga Adriana Senjaya Yoga Andriana Sendjaja