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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 Jurnal Teknologi Lingkungan
Imam Setiadi, Imam
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Education Energy Engineering Environmental Science

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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.
Co-Authors Achmad Sofian agus rifai Ai Diyanti, Ai Ardiana, Citra Arenda Reza Riyanda, Arenda Reza Bambang Suci Widijono, Bambang Suci Budi Setyanta, Budi Darmawangsa, Muhammad Rizky Fani, Ayudia Mutiara Hafiz, Mu'amar 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 Nanang D Ardi, Nanang D Nugraha, Purwaditya Oman Sulaeman, Oman Pratama, Achmad Wahyu Riza Rahardiawan Robbani, Muhammad Haqqiyuddin Robertus Haryoto Indriatmoko Satmoko Yudo W.H. Simamora, W.H. Wibowo, Ramadhana Yulinar Firdaus, Yulinar YUNUS