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All Journal Journal of Geoscience, Engineering, Environment, and Technology Jurnal Geosains Terapan
Reza Syahputra
Geology Study Program., FMIPA, Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia
Earth & Planetary Sciences Engineering Environmental Science Physics

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Building of Turbiditic Gas Field Dynamic Model with a Simplified 3D Simulation Software Octria Adi Prasojo; Reza Syahputra
Journal of Geoscience, Engineering, Environment, and Technology Vol. 3 No. 3 (2018): JGEET Vol 03 No 03 : September (2018)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1782.156 KB) | DOI: 10.24273/jgeet.2018.3.3.1857

Abstract

This study provides a novel approach of building 3D simulation model with extremely shorter time needed using Rubis simulation software from Kappa Engineering. The study focused on X Field that is located in a turbiditic setting, mainly consisted of separated channel bodies filled with gas, located in a slope apron or passive continental margin of Mahakam Delta. Methods of the study is quite contradictive with common reservoir simulation where it includes data integration, data quality control, model geometry building, reservoir properties distribution, and is followed by wells definition to build the 3D simulation model. Afterward, the reliability of the structural model was checked by the volume calculation for each segment from GeoX model where all dynamic and static data used in the simulation were checked using history matching data derived from well-testing. In conclusion, simulation was run and X Field will be producing for 23 years with 3 years and 10 months plateau rate. Where the static and dynamic data are already provided, the simulation conducted here was very beneficial during the exploration phase of a gas field where the whole process of modeling and simulation could be done only for 3 to 6 months.
Correlation Between Fracture Azimuth, Surface Lineaments and Regional Tectonics: A case study from Belik District, Central Java, Indonesia Reza Syahputra; Felix Muria Hasudungan Sihombing; Octria Adi Prasojo
Journal of Geoscience, Engineering, Environment, and Technology Vol. 4 No. 1 (2019): JGEET Vol 04 No 01 : March (2019)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1454.457 KB) | DOI: 10.25299/jgeet.2019.4.1.2294

Abstract

Two major strike-slip faults with northeast-southwest and northwest-southeast orientation have shifted the southern Central Java, including Belik District. Consequently, many smaller faults that have the same direction as the major faults and west-east direction folding systems were emerged. The orientation of these geologic structures could be observed from morphological features such as ridge and river. A quantitative approach was carried out to unravel the impacts of those geologic structures on the geomorphology of the study area, which is located between Slamet Mountain and Sindoro Mountain, Central Java province. The method used in this research was the structural geology analysis, including the interpretation of ridge and river lineament, the distribution of fractures, and statistical analysis. The research location is divided into four different segments based on its lineament and morphology. The lineament that has similar characteristics was tested using normality test of Kolmogorov-Smirnov. The Spearman test was used to obtain the correlation between surface lineament and fracture azimuth. All fracture azimuth, ridges and rivers tend to have northwest-southeast and northeast-southwest direction. These results show similar direction with strike-slip regional structural pattern. The statistical calculation and field observation indicate the influence of external factor on the change of the study area’s landform.
Identifikasi Zona Potensi Air Tanah Menggunakan Metode Sistem Informasi Geografis (SIG) dan Analytical Hierarchical Process (AHP) di Cekungan Air Tanah (CAT) Sumbawa Besar, Provinsi Nusa Tenggara Barat Nozzel Seagal Simanjuntak; Urwatul Wusqa; Reza Syahputra
Jurnal Geosains Terapan Vol 7 No 1 (2024): Jurnal Geosains Terapan
Publisher : Lembaga Ilmu Pengetahuan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64986/jgt.v7i1.118

Abstract

Cekungan Air Tanah (CAT) Sumbawa Besar, merupakan cekungan air tanah yang terletak di Kabupaten Sumbawa, Nusa Tenggara Barat. Daerah ini termasuk dalam wilayah tanggap darurat bencana kekeringan di Nusa Tenggara Barat, pada musim kemarau tahun 2023, sehingga dilakukan penelitian untuk mengidentifikasi zona potensi air tanah di wilayah ini. Penelitian ini menggunakan metode Sistem Informasi Geografis (SIG) dan Analytical Hierarchical Process (AHP). Metode SIG digunakan untuk analisis parameter menjadi bentuk peta, sedangkan metode AHP digunakan untuk menentukan tingkat kepentingan parameter serta pembobotannya. Terdapat 12 parameter yang digunakan dalam penelitian, yang dianggap mempengaruhi potensi air tanah, yakni geologi, geomorfologi, tutupan lahan, densitas kelurusan, jenis tanah, densitas drainase, kemiringan lereng, curah hujan, Topographic Wetness Index (TWI), roughness/kekasaran, Topographic Position Index (TPI), dan curvature/kelengkungan. Berdasarkan penggabungan seluruh parameter, dibuatlah peta zona potensi air tanah yang dibagi menjadi 3 kategori, yakni zona potensi air tanah rendah, mencakup sekitar 18% dari area penelitian, zona potensi air tanah sedang, mencakup sekitar 68% dari area penelitian, dan zona potensi air tanah tinggi, mencakup sekitar 14% dari area penelitian. Dari peta zona potensi air tanah, dapat disimpulkan bahwa zona potensi air tanah pada Cekungan Air Tanah Sumbawa Besar didominasi oleh zona potensi air tanah sedang, dengan sebagian kecil area berada pada zona rendah dan zona tinggi. Hasil perbandingan antara peta zona potensi air tanah dengan data lapangan menunjukkan hasil yang cukup baik, peta memiliki tingkat akurasi 78% terhadap data debit air sumur bor serta 85% terhadap luas daerah termasuk wilayah tanggap darurat bencana kekeringan.
Pemodelan Zona Kerentanan Fenomena Gerakan Tanah di Wilayah Kecamatan Bayah dan Sekitarnya Menggunakan Data Fenomena Gerakan Tanah Berbasis Titik Mohammad Faisal Rizal; Reza Syahputra; Urwatul Wusqa
Jurnal Geosains Terapan Vol 7 No 1 (2024): Jurnal Geosains Terapan
Publisher : Lembaga Ilmu Pengetahuan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64986/jgt.v7i1.122

Abstract

Wilayah yang menjadi daerah penelitian berada pada kavling pemetaan geologi lanjutan milik penulis yang mencakup Kecamatan Bayah dan Cibeber di Kabupaten Lebak dengan luas area 6x6 km2. Daerah penelitian ini memiliki banyak memiliki lereng yang cukup curam dengan curah hujan tinggi. Penelitian ini bertujuan untuk memetakan persebaran area zona kerentanan gerakan tanah dalam piksel resolusi 15, 25, 35, dan 45. Adapun data yang digunakan berupa data kejadian longsor dan 8 faktor pemicu kejadian gerakan tanah. Dari faktor tersebut diolah menjadi 8 peta faktor pemicu kejadian gerakan tanah yang kemudian dilakukan perhitungan Weight of Evidence (WoE). Dari perhitungan WoE masing-masing piksel resolusi didapati nilai kontras yang digunakan untuk perhitungan peta Landslide Susceptibility Index (LSI). Dari peta LSI didapati suatu peta zona kerentanan gerakan tanah dengan piksel resolusi berbeda dengan pembagian indikatornya menjadi zona kerentanan gerakan tanah sangat rendah, rendah, menengah, dan tinggi. Terakhir menggunakan metode Area Under the Curvature (AUC) didapati nilai tertinggi success rate berada pada piksel resolusi 15 (AUC = 0.736) dan predictive rate pada piksel resolusi 15 (AUC = 0.674). kemiringan 35-55, elevasi 400-500m, aspek lereng barat laut, kurvatur concave, vegetasi sedang, kerapatan struktur 558.36 – 745.45 m/m2, kerapatan sungai sedang, dan curah hujan tinggi, adalah kelas faktor pemicu yang berpengaruh terhadap kejadian gerakan tanah.
Co-Authors Felix Muria Hasudungan Sihombing Mohammad Faisal Rizal Nozzel Seagal Simanjuntak Octria Adi Prasojo Octria Adi Prasojo Urwatul Wusqa