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All Journal JURNAL AIR INDONESIA Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) BULLETIN OF THE MARINE GEOLOGY Jurnal Rekayasa Lingkungan Jurnal Geologi Kelautan: Media Hasil Penelitian Geologi Kelautan Indonesian Physical Review Jurnal Hukum Pelita Jurnal Teknologi Lingkungan
Imam Setiadi, Imam
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INTERPRETASI GEOLOGI BERDASARKAN HASIL PEMODELAN 2D DAN 3D BAWAH PERMUKAAN CEKUNGAN BILITON BERDASARKAN ANALISIS DATA GAYA BERAT Hafiz, Mu'amar; Setiadi, Imam; Nugraha, Purwaditya
JURNAL GEOLOGI KELAUTAN Vol 21, No 2 (2023)
Publisher : Pusat Penelitian dan Pengembangan Geologi Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/jgk.21.2.2023.826

Abstract

Cekungan Biliton merupakan satu dari 128 cekungan sedimen di Indonesia yang diklasifikasikan sebagai cekungan prospek hidrokarbon, namun belum banyak pemahaman serta publikasi mengenai cekungan ini. Metode gayaberat digunakan pada penelitian ini untuk mengetahui konfigurasi batuan dasar, mendelineasi subcekungan sedimen, dan mengetahui kondisi geologi bawah permukaan menggunakan Lowpass filter serta pemodelan 2D forward modeling dan 3D inversi. Hasil pemisahan anomali menunjukkan anomali regional memiliki rentang anomali 16.9 – 34.4 mGal dan anomali residual memiliki rentang anomali dari -5.8 – 4.7 mGal. Berdasarkan hasil analisis anomali residual dan enhancement anomaly dengan menggunakan filter TiltDerivative (TDR), daerah penelitian memiliki enam subcekungan dengan pola tinggian yang berarah timur laut – barat daya. Hasil pemodelan 2,5D forward modeling dan 3D inverse modeling menunjukkan daerah penelitian terdiri atas tujuh lapisan, lapisan pertama adalah lapisan termuda yang merupakan Formasi Cisubuh (ρ =2 gr/cc), Formasi Parang (ρ =2,1 gr/cc), Formasi Baturaja (ρ =2,2 gr/cc), Formasi Talang Akar (ρ =2,3 gr/cc), Formasi Banuwati (ρ =2,4 gr/cc), Formasi Jatibarang (ρ =2,5 gr/cc), dan lapisan basement(ρ =2,67 gr/cc).
GRAVITY MODELING OF SUBSURFACE STRUCTURES AND RESERVOIR CHARACTERIZATION USING SEISMIC INVERSION IN THE NIAS BASIN Wibowo, Ramadhana; Setiadi, Imam; Firdaus, Yulinar; Rahardiawan, Riza
BULLETIN OF THE MARINE GEOLOGY Vol 39, No 2 (2024)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.39.2.2024.890

Abstract

The development of interpretation techniques opens new exploration opportunities in the forearc basins of western Indonesia, such as the Nias Basin which show signs of oil and gas seepage. Gravity and seismic inversion analysis were used to look into the Nias Basin in order to evaluate its subsurface structure, the location of sedimentary sub-basins, and the possible presence of hydrocarbon reservoirs. After filtering the data for the Complete Bouguer Anomaly (CBA), a residual anomaly was obtained. This allowed for the quantitative interpretation of structures below the surface using 2D gravity forward modelling. Seismic and well data interpretation includes sensitivity analysis, a well-seismic tie, picking horizons, and acoustic impedance (AI) inversion. The residual gravity anomaly reveals eight sub-basin patterns spread out in the Nias Basin with a relative continuity direction of northwest-southeast following the lineaments of basement highs. The subsurface geological model identified four rock formations. From deepest to shallowest, these units are metamorphic bedrock (2.7 g/cc), Lelematua Formation (2.5 g/cc), Gomo Formation (2.4 g/cc), and Gunungsitoli Formation with an overlying alluvium (2.25 g/cc). Interpretation of well and seismic suggests a target zone at a 2,017 – 2,101 meters depth. Using a model-based hard constraint for AI inversion in this zone indicates possible carbonate reservoirs. Based on sensitivity analysis with an interval of 34,000 - 47,000 (ft/s)*(g/cc), an AI cutoff value of more than 34,000 (ft/s)*(g/cc) was obtained. The carbonate is estimated to be a tight carbonate in the limestone of the Gomo Formation.
Pengaruh Tekanan pada Reverse Osmosis terhadap Penyisihan Kadar Ion Klorida (Cl-) dan Total Dissolved Solids (TDS) pada Pengolahan Air Payau Rifai, Agus; Hartaja, Dinda Rita Krishumartani; Sulaeman, Oman; Setiadi, Imam; Ikhsan, Iik Nurul; Darmawangsa, Muhammad Rizky; Ardiana, Citra; Sofian, Achmad; Yunus
Jurnal Teknologi Lingkungan Vol. 25 No. 2 (2024)
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jtl.2024.705

Abstract

In the operation and maintenance of reverse osmosis (RO) systems, various challenges arise. One common issue faced is pressure fluctuations that can affect the quality of the produced water, shorten the lifespan of the membrane, and lead to system failure. This study aims to evaluate the performance of thin film composite spiral wound RO membranes in reducing Chloride ion (Cl-) and Total Dissolved Solids (TDS) levels in brackish water using low pressure. The RO membrane used in this research is made of polysulfone (PSF) with a thin film composite spiral wound type. The variables analyzed are the flow rate (Q) ranging from 1,000 to 2,000 mL/minute and the operational pressure (P) between 3.5 and 5 bar. The research results show that the RO membrane can reduce the Cl- level by 99.79% and TDS by 99.92% at a flow rate of 2000 mL/minute with an operational pressure of 5 bar. From the research findings, it can be concluded that an increase in operational pressure enhances the efficiency of reducing Cl- and TDS levels. This is due to the strong push on the feed that accelerates the salt penetration process through the membrane, which is then expelled through the retentate or wastewater stream. Abstrak Selama pengoperasian dan pemeliharaan sistem reverse osmosis (RO), berbagai tantangan muncul. Masalah yang umum terjadi adalah fluktuasi tekanan yang dapat mempengaruhi kualitas air yang dihasilkan, memperpendek umur membran dan menyebabkan kegagalan sistem. Penelitian ini bertujuan untuk mengevaluasi kinerja membran RO tipe thin film composite spiral wound dalam mengurangi kadar ion klorida (Cl-) dan TDS (Total Dissolved Solid) dalam air payau dengan menggunakan tekanan rendah. Membran RO yang digunakan dalam penelitian ini terbuat dari polysulfon (PSF) dengan jenis thin film composite spiral wound. Variabel yang dianalisis adalah laju aliran (Q) antara 1.000–2.000 mL/menit dan tekanan operasional (P) antara 3,5–5 bar. Hasil penelitian menunjukkan bahwa membran RO mampu mengurangi kadar Cl- sebesar 99,79% dan TDS sebesar 99,92% pada laju aliran 2.000 mL/menit dengan tekanan operasional 5 bar. Berdasarkan hasil penelitian, dapat disimpulkan bahwa peningkatan tekanan operasional meningkatkan efisiensi pengurangan kadar Cl- dan TDS. Hal ini disebabkan oleh dorongan kuat pada umpan yang mempercepat proses penetrasi garam melalui membran, yang kemudian dikeluarkan melalui aliran retenate atau air buangan.
IDENTIFICATION OF HORST AND GRABEN STRUCTURAL PATTERNS USING GRAVITY AND SECOND VERTICAL DERIVATIVE (SVD) METHODS IN THE LUBUKSIKAPING AREA OF WEST SUMATERA Zulkaromi, Muhammad; Setiadi, Imam; Suharno, Suharno; Mulyatno, Bagus Sapto; Haerudin, Nandi; Ferucha, Istifani
Indonesian Physical Review Vol. 4 No. 3 (2021)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v4i3.118

Abstract

The Lubuksikaping area is located between the main fault branching of the Sumateran Fault so it can be seen that there are many quite complex structures. This research was conducted to determine the structure pattern of the high (horst) and low (graben) that formed in the sub-surface of the Lubuksikaping area, West Sumatera. This research uses gravity data which will then be carried out by spectral analysis, upward continuation, separation of regional and residual anomalies, and Second Vertical Derivative (SVD) analysis. Furthermore, 2D forward modeling is carried out to determine the correlation between the 2D subsurface forward modeling and the resulting SVD graph. Based on the analysis of the regional anomaly map, it can be seen that the measured low anomaly is due to the area in the form of a structural valley formed due to the activity of the Sumatera Fault, while the high is thought to be a structural hill (horst) that forms an elongated mountain range and separated by graben. In addition, based on the analysis of the residual anomaly map, it can be seen that the low anomaly indicates the presence of a depositor (graben), whereas, the high anomaly is indicated as the presence of rocks with high-density contrast values. and is interpreted as a horst structure. Based on the analysis of the horst and graben patterns in the residual Bouguer anomaly, it can be seen that there is an elevation zone (horst) that are northwest and northeast on the residual map and it is known that there are 3 graben structures in Lubuksikaping, namely Panyabungan Graben, Rao Graben and Sumpur Graben with relative northwest-southeast direction. The 2D models of paths A-A' and B-B' show faults that are located relatively the same as the SVD graph obtained from the residual SVD anomaly map.
Konflik Kepentingan antara Kreditor Separatis dan Konsumen dalam Kepailitan Debitor Pengembang Properti Setiadi, Imam; Harjono, Dhaniswara K; Napitupulu, Diana Ria W
JURNAL HUKUM PELITA Vol. 6 No. 1 (2025): Jurnal Hukum Pelita Mei 2025
Publisher : Direktorat Penelitian dan Pengabdian (DPPM) Universitas Pelita Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37366/jhp.v6i1.5835

Abstract

This research examines the legal position of creditors holding Security Rights (Hak Tanggungan) in the sale and purchase of land and buildings that constitute the object of the Security Rights by a bankrupt debtor to consumers. Normatively, creditors holding Security Rights possess the status of separatist creditors as stipulated in Article 55 paragraph (1) of Law Number 37 of 2004 on Bankruptcy and Suspension of Debt Payment Obligations (UUK-PKPU), as well as Law Number 4 of 1996 on Security Rights over Land and Objects Related to Land (UUHT). However, in practice, the enforcement rights of these creditors often conflict with court decisions aimed at providing legal protection to consumers—particularly apartment unit buyers—who have acquired the property in good faith. This study employs a normative juridical method, using the statute approach and conceptual approach to examine the applicable legal norms and relevant legal principles. The findings lead to two primary conclusions. First, a bankruptcy decision against a property developer as debtor creates legal uncertainty for creditors holding Security Rights, especially when the collateral has already been sold to consumers. Conflicts arise between the creditor's priority rights and the consumer's protection as a good-faith purchaser. Current regulations, such as the Bankruptcy Law and the Security Rights Law, have yet to provide a clear resolution, thereby causing legal ambiguity. Second, the Bankruptcy Law is designed to protect creditors when a debtor fails to fulfill debt obligations, granting them access to the debtor’s estate. Creditors holding Security Rights (separatist creditors) should continue to receive maximum legal protection in accordance with the lex specialis principle under the Security Rights Law, which grants authority for parate execution, despite the time limitations imposed under the Bankruptcy Law
HYDROCARBON POTENTIAL OF THE OFFSHORE AKIMEUGAH BASIN FROM MESOZOIC-PALEOZOIC BASED ON GEOLOGICAL AND GEOPHYSICAL ANALYSIS Setiadi, Imam; Rasyid, Faris N; Zulivandama, Shaska Ramadhan; Firdaus, Yulinar; Santy, Lauty D.; Saleh, Hanif M.; Rachman, Muhammad G.; Djaja, Andrian W.; Nurdin, Nazar; Rahardiawan, Riza; Subarsyah, Subarsyah
BULLETIN OF THE MARINE GEOLOGY Vol 40, No 2 (2025)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.40.2.2025.954

Abstract

Akimeugah Basin is one of the basins with discovery status, however hydrocarbon production has not yet been established. One of potential petroleum play type for further investigation, estimated to contain hydrocarbon reserves in the offshore Akimeugah Basin, is the Mesozoic–Paleozoic sedimentary play, interpreted to have originated from the Australian passive margin. This study aims to analyze geological and geophysical data to delineate the sub-basin pattern and characterize petroleum system elements. The analysis integrates gravity data interpretation, geochemical evaluation of source rocks, and subsurface interpretation based on seismic and well data. Results indicate that source rocks in the Kola-1 well are primarily composed of Type III (gas-prone) and secondarily of Type II (oil/gas-prone) kerogen. Thermal maturity analysis shows that the Woniwogi, Aiduna, and Modio Formations have reached the oil window. Reservoir potential has been identified in the Tipuma Formation (Triassic), Aiduna Formation (Permian), and Modio Dolomite (Devonian–Silurian). Seal rocks consist of regional and intraformational units composed of tight siltstone and shale. Trapping mechanisms in this area include a combination of structural traps such as fault-bounded anticlines and stratigraphic traps represented by sub-unconformities. Identified exploration leads include seven within the Modio Dolomite structural play, six within the Permian Aiduna Sandstone play, and four within the Triassic Tipuma Sandstone play.
ACOUSTIC FACIES AROUND THE INTRUSIVE COMPLEX OF SALAHNAMA AND PANDANG ISLANDS, MALACCA STRAIT , S.Si., MT., Subarsyah; Albab, Ali; Zulivandama, Shaska Ramdhan; Saputro, Eko; Ali, Arif; Setiadi, Imam; Zulfikar, Muhammad; Nauval, Faris; Rahardiawan, Riza
BULLETIN OF THE MARINE GEOLOGY Vol 40, No 2 (2025)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.40.2.2025.938

Abstract

Salahnama and Pandang Islands lie on the main range of the granite province; both islands are located in the Sunda Shelf, Malacca Straits. These islands are composed of intrusive rocks from Berhala. The rock’s existence will offer a significant contribution to the distribution of surface sediments in the surroundings. The sea dynamics and the geometry of the Malacca Strait will also have an impact on the seabed. Apart from that, global factors such as sea level changes will lead to transformation of the depositional environment and subsurface geology in the strait. Geological conditions of the seabed surface and subsurface can be understood and interpreted based on the acoustic characteristics and reflector patterns of a seismic section. Then, based on the acoustic character and reflector pattern, an acoustic facies can be defined. Seismic data measurements have been carried out around Salahnama and Pandang Islands in 2024. Based on the results of the seismic section, the acoustic facies in the study area are classified into 6 (six), which include AF I – AF VI. Seabed morphological features in the form of sand dunes were identified in the first acoustic facies (AF I); this feature is formed due to geometric aspects, surface currents, and bottom current's which may or may not be triggered by tidal vortices. Acoustic Facies II (AF II) is characterized by sandwave or ripple marks formed by strong seabed currents. AF III was formed after the Last Glacial Maximum (LGM) ended and the depositional environment returned to a shallow marine environment, characterized by a transparent pattern in the seismic section. The erosional truncation at the upper boundary of AF IV indicates a change in the depositional environment from shallow marine to coastal or terrestrial environments during the Last Glacial Maximum period. AF V is acoustic bedrock, and AF VI is characterized by a chaotic pattern, which is interpreted as granitic intrusive rocks.
Co-Authors , S.Si., MT., Subarsyah Achmad Sofian agus rifai Ai Diyanti, Ai Albab, Ali Ardiana, Citra Arenda Reza Riyanda, Arenda Reza arif ali, arif Bagus Sapto Mulyatno Bambang Suci Widijono, Bambang Suci Budi Setyanta, Budi Darmawangsa, Muhammad Rizky Djaja, Andrian W. Eko Saputro, Eko Fani, Ayudia Mutiara Ferucha, Istifani Hafiz, Mu'amar Harjono, Dhaniswara K Hartaja, Dinda Rita K. Hartaja, Dinda Rita K. Hartaja, Dinda Rita Krishumartani Hermes Panggabean Ikhsan, Iik Nurul Kristyawan, I Putu Angga Kustianto, Irwan Lauty Dwita Santi, Lauty Dwita Muhammad Zulfikar Nanang D Ardi, Nanang D Nandi Haerudin Napitupulu, Diana Ria W Nauval, Faris Nazar Nurdin Nugraha, Purwaditya Oman Sulaeman, Oman Pratama, Achmad Wahyu Rachman, Muhammad G. Rasyid, Faris N Riza Rahardiawan Robbani, Muhammad Haqqiyuddin Robertus Haryoto Indriatmoko Saleh, Hanif M. Santy, Lauty D. Satmoko Yudo Subarsyah Subarsyah Suharno Suharno W.H. Simamora, W.H. Wibowo, Ramadhana Yulinar Firdaus, Yulinar YUNUS Zulivandama, Shaska Ramadhan Zulivandama, Shaska Ramdhan Zulkaromi, Muhammad