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All Journal Reaktor IJOG : Indonesian Journal on Geoscience Jurnal technoscientia Jurnal Ilmiah Dinamika Rekayasa (DINAREK) UNEJ e-Proceeding Journal of Geoscience, Engineering, Environment, and Technology JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) Jurnal Geomine Indonesian Mining Journal PROMINE Buletin Sumber Daya Geologi Jurnal GEOSAPTA JURNAL TEKNOLOGI TECHNOSCIENTIA Indonesian Journal on Geoscience Indonesian Journal on Geoscience Journal of Applied Geology SRIWIJAYA JOURNAL OF ENVIRONMENT Indonesian Mining Journal Bulletin of Geology Scientific Contribution Oil and Gas
Donatus Hendra Amijaya
Departemen Teknik Geologi, Fakultas Teknik, Universitas Gadjah Mada
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Public Health

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Determination of Overpressure Zone and Its Mechanism in Baong Formation of the "Y" Field in North Sumatera Basin Andrea Hasbullah; Hendra Amijaya; Jarot Setyowiyoto
Journal of Applied Geology Vol 8, No 1 (2023)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.63556

Abstract

The “Y” Field is one of the offshore areas in the North Sumatra Basin which is believed to have an important role in hydrocarbon exploration in the future. The North Sumatra Basin is known as an area that has high overpressure conditions and sometimes overpredicts in determining the amount of overpressure, especially in the Baong Formation. The purpose of this research is to determine the top and bottom overpressure zones, to know the vertical distribution of overpressure, and to find the main factors causing the overpressure in the Baong Formation.The data used in this study were 5 wells which have wireline log data, formation pressure data, leak of test, final well reports, mud logs, as well as 29 lines of 2D seismic data and 1 3D seismic data. The method used in this study was the Eaton method to determine pore pressure whereas the cross-plot wireline log method, the AI (acoustic impedance) inversion method and the stacking velocity were used to determine pore pressure.The study indicated that the overpressure zone is located in the Baong Formation at 1650 - 2108 m depth with a pore pressure of around 2891.70 - 3580 psi.  The overpressure is caused by loading mechanism, namely disequilibrium compaction. This is influenced by the thickness of the formation above Baong Formation.
Source Rock Quality and 1D Maturity Model in Pendalian Sub-basin, Central Sumatra Basin Putri Dwi Afifah; Hendra Amijaya; Sarju Winardi; Widi Atmoko
Journal of Applied Geology Vol 8, No 1 (2023)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.78104

Abstract

Pematang Formation is well known as the main source rock in the Central Sumatra Basin (Mazied et al., 2008). The formation which acts as source rock has been studied thoroughly in the central and eastern parts of the basin, but research regarding source rock in the western part of the basin, which is the study area, is very limited. This paper aims to define the quality of source rock from a geochemical view through the determination of organic content quantity based on the Total Organic Carbon (TOC) data, determining the type of kerogen, and thermal maturity of the source rock according to the values of Tmax and Vitrinite Reflectance (%Ro). Burial history and thermal maturity models (1D basin modeling) were also constructed to understand the timing of hydrocarbon generation. The results show that Pematang Formation among Sihapas and Telisa Formation has good organic content with TOC ranging from 0.2 to 42.48 wt%, and the maturity parameters indicate that the Pematang Formation has reached the mature stage. Both formations are dominated by Type II kerogen. 1D modeling of the SHT-1 Well indicates that the Pematang Formation is currently in the oil maturity window starting from early oil to main oil at 20.61 Ma, but the model of the SMB-1 Well has not reached the oil maturity window. Tectonic activity is estimated to have a significant effect on this difference when the uplift activity of Bukit Barisan in the Middle Miocene increased the maturity in the northwest, but the inversion that occurred in the Late Miocene resulted in uplift and erosion of young sediments, thus lowering the temperature in some area.
FUZZY LOGIC APPROACH FOR POST-MINING LAND USE PLANNING: A CASE STUDY ON COAL MINE OF PT. ADARO INDONESIA-SOUTH KALIMANTAN Mohamad Anis; Arifudin Idrus; Hendra Amijaya; Subagyo Subagyo
Indonesian Mining Journal Vol 20 No 2 (2017): INDONESIAN MINING JOURNAL VOL. 20 NO. 2 October 2017
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol20.No2.2017.371

Abstract

Currently coal companies, especially in South Kalimantan, have not yet been or only slightly entered the post-mining stage, although part of the mining blocks have been totally exploited, so that the company should have been preparing for the development of other sectors (non-mining). It shows that optimization of coal resources from exploration, mining to post-mining land use is necessary to ensure sustainable mining and sustainable development in terms of meeting the conservation aspect. To meet all aspects of conservation, the achievement of optimization in a series of mining business activities is started from the potential optimization of the coal remain resources until the optimization of post-mining land use is absolutely required. This research has analyzed several alternative sectors outside mining, which will be selected for optimization of utilization or post-mining land use, including plantation, recreation, industry and conservation sectors. The analyzing process used several parameters to assess the selected sectors including rainfall, slope and land use. Therefore, this study uses an approach of GIS-based methods (knowledge-driven), mainly fuzzy logic for post-mining land use planning. The selected mining area for this study belongs to PT. Adaro Indonesia company that has a Work Agreement for Coal Mining Exploitation. The result shows the suitability of plantation for the optimization of land use in all mining sites and also for conservation areas or protected forests. 
Model Pengendapan Reservoar Gita Interval 34-1, Formasi Talangakar, Lapangan Widuri, Cekungan Asri heryanti - efendi; DONATUS HENDRA AMIJAYA; JAROT SETYOWIYOTO
Bulletin of Geology Vol 2 No 2 (2018): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2018.2.2.1

Abstract

Interval 34-1 is the third largest reservoir in Widuri Field, Asri Basin with cumulative production reaching 11 Million Metric Barrels of Oil (MMBO) from Original Oil in Place (OOIP) 31 MMBO. At Interval 34-1, Gita Reservoir, Talangakar Formation, Widuri Field, no thorough facies analysis has been performed on this sandstone reservoir. This research was conducted to find out lithology facies of research area and how to correlate lithology facies with deposition system. The reservoir deposition model in this research will be built through the understanding of lithology facies and settling system so that geology is expected to be close to the actual condition. The data used in this study are core rock analysis data from three wells with a total length of 485 feet, well log data from 7 production wells and 1 exploratory well, petrography and XRD data, biostratigraphy and paleobathymetry data, and map of seismic attribute of acoustic impendance. The first step is to identify the lithofasies and facies associations for the association of the depositional environment. The sandstone reservoir Gita Interval 34-1 is interpreted to consist of four facies associations namely; estuarine point bar, shallow marine, marsh/swamp, and intertidal flat. The second stage is to correlate the well log data stratigraphy to map the facies overlays horizontally. The third step is to integrate secondary data in the form of seismic attribute maps with log correlation and facies association analysis to predict the deposition model of each cycle adjacent to Interval 34-1. Reservoir deposition model Gita Interval 34-1 at the bottom develops supratidal marsh/swamp. Subsequent transgression phases resulted in the deposition of shallow marine deposits, followed by estuary channel deposits in subsequent regression periods. Subsequent transgression produces intertidal flat deposit, followed by shallow marine deposits in subsequent transgression periods. Keywords: Asri Basin, facies, facies associations, depositional model
Natural Gas Geochemistry in Jambanan Area, Sidoharjo, Sragen, Central Java, Indonesia Dwi Yuda Wahyu Setya Pambudi; Amijaya, Hendra
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 3 (2024): JGEET Vol 09 No 03 : September (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.3.16207

Abstract

Natural gas was encountered on PAMSIMAS well drilling in the Jambanan area. Geochemical studies are needed to determine gas genesis in this area. Geochemical studies were carried out using the GC gas composition method on gas samples located at three locations, namely SRG-01, SRG-02, and SRG-03. The three gas samples had a methane content of 47.61 - 87.97mol.%. All three have a low wettability level (0.03-0.05%) which indicates that the gas is very dry. GC-IRMS Method was also used on SRG-01 and SRG-02 gas sample. Those gas samples have δ13C Methane characteristics of -40.7‰ (SRG-01) and -45.6‰ (SRG-02) with δD methane values ​​of -171‰ (SRG-01) and -178‰ (SRG-02). This shows that the gas at those are thermogenic gas and it comes from different levels of maturity, where the gas at SRG-01 is more mature than the gas at SRG-02.
Quantifying the Impact of Siderite Composition and Reservoir Resistivity (Rt) on Water Saturation Estimation in Low-Resistivity Sideritic Sandstone Reservoirs Using the Graphic Plot Method Sarju Winardi; Sugeng Sapto Surjono; Donatus Hendra Amijaya; Wiwit Suryanto
Scientific Contributions Oil and Gas Vol. 47 No. 2 (2024): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

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

Abstract

The case studies on low-resistivity-low-contrast (LRLC) reservoirs have started using a conductive matrix model approach based on the assumption that the rock matrix is composed of conductive minerals. The previous studies on reservoir resistivity (Rt) against conductive-minerals-rich sandstone were limited to pyritic types without developing the others such as the sideritic which was found in Indonesia. Therefore, there is a need to determine the relationship between siderite volume within the sandstone reservoir and the reduction number of Rt. Relation profiles were applied to accurately estimate the actual water saturation (Sw) while the resistance of the sandstone samples was determined through the voltage (V, volt) and current (I, ampere). The samples were designed as pseudo-core in the laboratory and simulated to have siderite composition in the range of 0-30% followed by the injection of brine at different saturation conditions. The Rt was calculated through the modification of Wenner and Ohm’s Law and later compared graphically with siderite volume of each Sw line. It was observed from the results that siderite led to an exponential reduction in Rt value. Moreover, the threshold volume of siderite required to reduce Rt significantly to 50% of the original value was found to be 6%. The actual Sw was later estimated simply through the application of the Graphic Plot Method from the curves. Keywords: low resistivity, reservoir, LRLC, siderite, sandstone, water saturation
PERHITUNGAN STOK KARBON INORGANIK BATUGAMPING DAN FLUKS KARBON DI KAWASAN BENTANG ALAM KARST (KBAK) TASIKMALAYA, JAWA BARAT Fahrialam, Aldian; Sinabang, Paul Vito Parluhutan; Giwangkara, Atifa Maritza; Gussyak, Selasian; Hidayat, Tantan; Anggara, Ferian; Petrus, Himawan Tri Bayu; Amijaya, Hendra
Jurnal Lingkungan dan Bencana Geologi Vol 15, No 3 (2024)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34126/jlbg.v15i3.514

Abstract

ABSTRAKKawasan Bentang Alam Karst (KBAK) merupakan kawasan yang dilindungi dan perlu adanya upaya konservasi untuk mencegah terjadinya pengerukan dan pembukaan lahan secara ilegal. Tercatat, konsentrasi karbondioksida secara global per tahun 2018 mengalami peningkatan hingga 50% dari mulainya revolusi industri dengan konsentrasi sebesar 421 ppm. Tujuan penelitian ini adalah melakukan perhitungan terhadap karbon yang tersimpan di KBAK Tasikmalaya sebagai upaya konservasi terhadap KBAK Tasikmalaya. Perhitungan stok karbon dibagi menjadi dua area. Area utara yang terdiri dari Anggota Sukaraja memiliki stok karbon sebesar 418.528,05 ton dan area selatan yang tersusun atas Formasi Kalipucang memiliki stok karbon sebesar 13 x 106 ton. Besaran nilai dari stok karbon dipengaruhi oleh kadar CaO dalam batugamping serta volume batugamping. Total fluks karbon yang dihasilkan di daerah penelitian mencapai 4,98x1010 mg/hari hingga 9,78x1013 mg/hari dengan rata - rata nilai per sampel 3,16x1011 hingga 2,58x13 mg/hari. Besaran nilai fluks karbon dipengaruhi oleh kadar ion bikarbonat dan nilai debit.Kata kunci: batugamping, fluks karbon, karbon, kars, stok karbonABSTRACTThe Karst Landscape Conservation Area (KBAK) is a protected area that requires conservation efforts to prevent illegal excavation and land clearing. It is noted that the global concentration of carbon dioxide in 2018 increased by up to 50% since the beginning of the industrial revolution, with a concentration of 421 ppm. The purpose of this research is to calculate the carbon stored in KBAK Tasikmalaya as a conservation effort for KBAK Tasikmalaya. Carbon stock calculations are divided into two areas. The northern area, consisting of the Sukaraja Member, has a carbon stock of 418,528.05 tons, and the southern area, consits of the Kalipucang Formation, has a carbon stock of 13 x 106 tons. The magnitude of the carbon stock value is influenced by the CaO content in limestone and the volume of limestone. The total carbon flux generated in the research area ranges from 4,98x10 10 mg/day until 9,78x1013 mg/day , with an average of each sample value ranging from 3,16x1011 to 2,58x13 mg/day. The value of carbon flux is influenced by the bicarbonate ion content and the water discharge value.Keywords: Cox proportional hazard, south and north pacific, climate change, tropical cyclone
Co-Authors Adibah, Najibatul Agung Harijoko Agung Rizki Perdana Agus Winarno Agus Winarno Ahmad Z.A. Ansory Akmaluddin Akmaluddin Andrea Hasbullah Ansory, Ahmad Z.A. Arifudin Idrus Beny Wiranata Beny Wiranata Deddy Tanggara Dwi Yuda Wahyu Setya Pambudi Edy Nursanto Edy Nursanto Edy Nursanto Eko Bayu Satria Fahrialam, Aldian Ferian Anggara Friederich, Mike C. Giwangkara, Atifa Maritza Gussyak, Selasian Harli Talla heryanti - efendi Hidayat, Tantan Htwe, Paike I Gusti Ngurah Antaryama Isnadiyati, Oyinta Fatma Jarot Setyowiyoto Jessica Trofimovs Kyuro Sasaki Miftahul Huda Mike C. Friederich Mohamad Anis Mohamad Anis Mohamad Anis Mohamad Anis Mohamad Anis, Mohamad Moore, Tim Allen Najibatul Adibah Ngisomuddin Ngisomuddin Ngisomuddin, Ngisomuddin Nomensen Ricardo Oyinta Fatma Isnadiyati Paike Htwe Pameco, Pracoyo Adi Pameco, Pracoyo Adi Perdana, Agung Rizki Petrus, Himawan Tri Bayu Pracoyo Adi Pameco Putri Dwi Afifah Ricardo, Nomensen Salahuddin Husein Sarju Winardi Sasaki, Kyuro Sinabang, Paul Vito Parluhutan Subagyo Pramumijoyo Subagyo Pramumijoyo Subagyo Pramumijoyo, Subagyo Subagyo Subagyo Subagyo Subagyo Subagyo Subagyo Subagyo Subagyo Sugeng Sapto Surjono Supardin Nompo Tim Allen Moore Trofimovs, Jessica Widi Atmoko Wiranata, Beny Wiwit Suryanto