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All Journal Jurnal Geocelebes Journal of Geoscience, Engineering, Environment, and Technology Indonesian Physical Review Geosains Kutai Basin
Lepong, Piter
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Earth & Planetary Sciences Education Engineering Environmental Science Physics

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Identifikasi Keberadaan Hidrokarbon Menggunakan Inversi Impedansi Akustik dengan Algoritma Artificial Neural Network (ANN) Maulana, Ansar; Lepong, Piter; Sutaji Putri, Devina Rayzy Perwitasari; Munir, Rahmiati
GEOSAINS KUTAI BASIN Vol. 7 No. 1 (2024)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v7i1.1127

Abstract

Hydrocarbons are the main energy source in the world, especially in Indonesia, this is what makes hydrocarbons a natural resource that has been extensively explored to determine the presence of hydrocarbons. The exploration used is the Geophysics method, namely the seismic method and the well logging method, both methods are processed to provide an overview of the subsurface. The data processing technique used is acoustic impedance inversion modeling which aims to determine the characteristics of the reservoir based on changes in the acoustic impedance value in each layer. In this study using model-based acoustic impedance inversion using an artificial neural network (ANN) algorithm and the results obtained in the inversion analysis obtained an error of 0.002, so that the model can be used on seismic trace data to produce an acoustic impedance model. modeling section with a value of less than 5000 which may mean that there are hydrocarbons in the research location. Keywords: Artificial Neural Network, Hydrocarbons, Acoustic Impedance, Inversion.
Analisis Potensi Swabakar (Self-Combustion) Berdasarkan Data Proksimat pada Batubara PT. Geoservices Samarinda Wahidah, Wahidah; Fajarwati, Delia Aurora; Lepong, Piter; Alamsyah, Andi
GEOSAINS KUTAI BASIN Vol 5 No 2 (2022)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v5i2.1062

Abstract

The self-combustion phenomenon that has the potential to cause fires in the coal mining industry in East Kalimantan is the subject of this study. The purpose of this study is to determine the quality and characteristics of coal that has the potential to trigger self-heating. In this research, 5 (five) samples of coal quality are analyzed from PT. Geoservice Samarinda using the proximate analysis method and analysis of calorific value and total sulfur. Next, determine ranking of coal and analyze the characteristics of coal samples that are prone to potential self-combustion. The results show that the five coal samples included in Sub-Bituminous rank with medium volatile matter considered to have sufficient potential to experience self-combustion. The most susceptible coal sample is sample code D1 because it also has lower inherent moisture and ash content and higher total sulfur content than other coal samples. However, further tests still need to be carried out to determine the percentage of total sulfur (pyrite) as a trigger for self-combustion. Environmental factor analysis is also required for validation.
IDENTIFIKASI KAWASAN ZONA PANAS BUMI (GEOTHERMAL) DI DAERAH X MENGGUNAKAN METODE MAGNETOTELLURIK Andini, Dela; Lepong, Piter; Natalisanto, Adrianus Inu
GEOSAINS KUTAI BASIN Vol 3 No 1 (2020)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v3i1.599

Abstract

Geothermal is the heat formed inside the earth's crust. The heat of geothermal produces hot water, steam, and heat rocks along with other minerals and gases to be genetically inseparable in geothermal systems. One of the geophysical method which can be used to determine the area of a geothermal system is magnettoteluric. The method is based on the values of resistivity distribution of the rock formation. In the study on the identification of geothermal zone in the X area, it was found the resistivity distribution in 1D and 2D models by using the magnettoteluric method. The models were created by processing of magnettoteluric data taken from three measuring lines. The 1D model was the resistivity distribution vertically generated from the depth of each measurement point, while the 2D model was the resistivity distribution generated in vertical and lateral to form the image of geothermal system. In the 1D model the resistivity distribution values were in the range of 66 ohm.m and 270 ohm.m, while in the 2D model the resistivity distribution values were in the range of 66 ohm.m and 221 ohm.m. From the image it could be interpreted the low resistivity related to the cap rock zone located above the reservoir zone, the medium resistivity related to the reservoir zone located below the cap rock zone, and the high resistivity related to the heat source zone located below the reservoir zone. The study found that the position of geothermal reservoir was under the cap rock zone.
INTERPRETASI KECEPATAN GELOMBANG GESER (VS) PADA LAPISAN BAWAH PERMUKAAN DAERAH ‘X’ DENGAN METODE SEISMIK MASW (MULTICHANNEL ANALYSIS OF SURFACE WAVE) Daud, Anye Gidalti; Lepong, Piter; Natalisanto, Adrianus Inu
GEOSAINS KUTAI BASIN Vol 4 No 1 (2021)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v4i1.678

Abstract

ABSTRACT MASW or Multichannel Analysis of Surface Wave is a seismic method that utilizes the dispersive property of surface wave to interpret surface wave velocity which is directly related to the stiffness of a subsurface layer reaching 30 meters depth that beneficial in the geoengineering field. The goal of this research is to interpret shear wave velocity of subsurface layer in an area to inform the stiffness level of - subsurface layer through shear wave velocity and depth profiling. The steps of this research are converting seismic raw data into numeric data, generating dispersion image, extracting dispersion curve from dispersion image and analyzing dispersion curve by theoretical and experimental data. Based on analysis results, shear wave velocity obtained up to 170m/s with 16 meters investigation depth. Whereas fundamental mode frequency of Rayleigh wave between 2 – 12 Hz. Low shear wave velocity (<180 m/s) of investigated area indicates that the subsurface layer dominated with soft soil which is an early sediment in the shape of alluvium layer and has high seismic wave amplification that hazardous for building build upon the layer.
ANALISIS PENYEBARAN SIFAT FISIS BATUAN RESERVOIR DENGAN METODE GEOSTATISTIK (STUDI KASUS: LAPANGAN BOONSVILLE, TEXAS, AMERIKA SERIKAT) Puspita Sari, Claudia Dewi; Lepong, Piter; Natalisanto, Adrianus Inu
GEOSAINS KUTAI BASIN Vol 2 No 1 (2019)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v2i1.349

Abstract

Physical properties of reservoir rocks are very important in hydrocarbon production. This study analyzes the physical properties of porosity value in reservoir rocks. The aim was to estimate the distribution of porosity in the reservoir rocks. There are several methods available in estimating the reservoir properties distribution. This study uses the geostatistical method to estimate the distribution of porosity value in three different wells in Boonsville Field. Semivariogram analysis is essential steps in geostatistical method in analysis the autocorrelation the the petrophysical data of geophysical logging. The experimental semivariogram with spherical model obtained the sill value 14,94; nugget value 7,85; and range value 1646. The value use as input data in estimate the distribution of porosity value by ordinary kriging. Result of estimation using geostatistical method shown in around well area of IG Yates 31 and IG Yates 19 have the most optimal physical properties as reservoir rocks.
Analisis Proksimat dan Ultimat Terhadap Total Sulfur dan Nilai Kalori pada Batubara (PT Geoservices Samarinda) Fajarwati, Delia Aurora; Lepong, Piter; Wahidah, Wahidah
GEOSAINS KUTAI BASIN Vol. 6 No. 2 (2023)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v6i2.1145

Abstract

The price of coal in the market is largely determined by the caloric value. To find out what parameters affect the calorific value, it is necessary to do a correlation between the calorific value, inherent moisture, ash content and volatile matter contained in the coal where these contents are found in the proximate analysis and the carbon, nitrogen and hydrogen content in the ultimate analysis. In this study, apart from correlating the proximate data and ultimate data with calorific value, these two data were also correlated with total sulfur because sulfur greatly impacts the environment, so it is necessary to ensure that the amount is below the set threshold. The correlation used is Pearson Correlation. Determination of coal classification using standards Americans Society For Testing & Materials (ASTM). Correlation test results showed that total sulfur had a very strong correlation with inherent water content, volatile matter content, fixed carbon and hydrogen content. The calorific value correlates very strongly with the inherent water content, fixed carbon and nitrogen content. However, total sulfur and calorific value did not correlate with ash content. The coal classification of the five samples is included in the sub-bituminous class with a calorific value range of 10,500 Btu/lb - 8,300 Btu/lb.
IDENTIFIKASI ZONA MINERAL BIJIH BESI BERDASARKAN PEMODELAN INVERSI 3D MENGGUNAKAN METODE MAGNETIK Ramadana, Muhammad; Lepong, Piter
GEOSAINS KUTAI BASIN Vol 1 No 2 (2018)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v1i2.284

Abstract

The geomagnetic method is one of the geophysical methods based on measurement of the variation of the intensity of the magnetic field at the Earth's surface caused by the existence of variations have been magnetized objects distribution under the Earth's surface. Added to the results of a study of literature method of gravity as the comparison data to see the structure of the research area on a regional basis. From the results of gravity anomaly values obtained residual (High Pass Filter) using Gaussian filtering of local gravity values obtained range between -25 mGal until 16,1 mGal at a depth of 1,2 km on a regional basis have geological structures that affect the shape of the rock formations in the area of research is the result of the adoption of rock (intrusion) and from the results of magnetic inversion models 3D mineralized zone indication obtained iron ore to the value suseptibilitas range between 0.01 until 0.02556.
Penentuan Litologi Batuan di Daerah Samboja Berdasarkan Analisis Pemodelan 3D Data Cutting dan Data Logging Geofisika Situmeang, Edberg; Djayus, Djayus; Wahidah, Wahidah; Supriyanto, Supriyanto; Lepong, Piter
GEOSAINS KUTAI BASIN Vol. 6 No. 2 (2023)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v6i2.1087

Abstract

The interpretation of rock lithology is inaccurate if it only uses cutting data, so it must be assisted with other data, including logging data. The purpose of this study was to determine the lithological arrangement of rocks based on cutting data and logging data and to compare the cross section results of cutting data and logging data. This study uses cutting data and logging data (gamma ray log and density log). Cutting data and logging data will be interpreted and processed into 2D and 3D sections which are corrected with topographical data including coordinates, elevation values, strike dip and total depth. The results of processing from both methods, obtained lithology composition in the form of soil, silt, sand, coal, clay, carbon and carbont clay.
Continuity Analysis of Groundwater Aquifers Using Geoelectrical Vertical Electrical Sounding (VES) Method with Schlumberger Configuration in Serayu-Citanduy Road and Golf Course, Tanah Merah Village, North Samarinda District, Indonesia Himawan Sadewo, Hengky; Djayus; Mislan; Lepong, Piter
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 1 (2025): JGEET Vol 10 No 01 : March (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.1.10571

Abstract

This study aims to analyze the continuity of the aquifer system between the Serayu-Citanduy area and the Golf Course area in Tanah Merah Village, North Samarinda District, using the Vertical Electrical Sounding (VES) method with Schlumberger configuration. Building on previous research that compared geoelectrical mapping and sounding methods for identifying aquifer layers in the Serayu-Citanduy area, this study focuses on aquifer connectivity based on resistivity profiles and geological interpretation. The VES data collected from eight measurement points revealed significant variations in lithology and aquifer types. At the Golf Course, the surface layer consists of soil (0.8 to 2.6 m depth), overlying a thick silt layer (up to 160 m depth) and a permeable sandstone aquifer between depths of 152.7 m and 160 m. The resistivity of the sandstone aquifer is approximately 20-50 Ωm. Meanwhile, at the Serayu-Citanduy Road, the lithology is divided into five main layers, with the surface layer (0.8 to 2.5 m) followed by a silt layer (5.2 to 22.9 m) and a sandstone layer from 22.9 m to 200 m depth. The resistivity of the sandstone aquifer here is higher, ranging from 50 to 150 Ωm, and is identified as an unconfined aquifer above a shale layer. Below 100.1 m, a confined aquifer is found beneath the shale layer, with resistivity values exceeding 100 Ωm. The correlation between the VES points at the Golf Course and Serayu-Citanduy Road shows continuity between the aquifer systems despite variations in thickness. These findings provide new insights into the hydrogeology of Tanah Merah and highlight the importance of groundwater management strategies for sustainable water use in North Samarinda District.
Estimasi Kedalaman Magnetic Basement di North Queensland, Australia dengan Menggunakan Metode Analisis Spektral Mawadah, Anis; Lepong, Piter; Natalisanto, Adrianus Inu
GEOSAINS KUTAI BASIN Vol. 8 No. 1 (2025)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v8i1.1468

Abstract

Metode magnetik adalah metode geofisika yang didasarkan pada variasi medan magnet yang disebabkan oleh perbedaan sifat megnetik batuan. Tujuan dari penelitian ini adalah untuk mengetahui estimasi kedalaman magnetic basement di North Queensland, Australia, berdasarkan data Intensitas Magnetik Total (TMI) di lokasi penelitian. Data megnetik diproleh dari website Commonwealth of Australia (Geoscience Australia). Penelitian ini menggunakan metode analisis spektral untuk memisahkan anomali magnetik yang dihasilkan oleh sumber yang lebih dalam (anomali regional) dan anomali magnetik yang dihasilkan oleh sumber yang lebih dangkal (anomali residual). Berdasarkan hasil penelitian, terdapat perbedaan anomali yang diperoleh dari 5 profil/garis yang mengarah dari Timur ke Barat pada peta lokasi penelitian. Hasil analisis spektral menunjukkan bahwa rata-rata kedalaman anomali regional dan residual masing-masing adalah 36,75 km dan 3,48 km yang menunjukkan kedalaman magnetic basement menjadi lebih dangkal ke arah utara pada lokasi penelitian. Di bagian selatan area penelitian, diperoleh kedalaman 75,51 km. Sedangkan semakin ke utara magnetic basement menjadi lebih dangkal yang diperoleh pada kedalaman 22,96 km. Hasil penelitian ini diharapkan dapat berguna dalam memetakan kedalaman basement magnetik di wilayah Gunung Isa, mengingat Gunung Isa merupakan kota tambang yang kaya akan mineral. Oleh karena itu, estimasi kedalaman ruang bawah tanah magnetik akan berguna untuk menentukan batas ruang bawah tanah dan sedimen untuk mengidentifikasi cekungan yang berpotensi mengandung mineral.
Co-Authors Abbas, Asri Yana Pratama Aditya Rinaldi Adrianus Inu Natalisanto Alamsyah, Andi Amalia, Ani Andini, Dela Antony, Nurvani Arifullah, Ery Asmaidi Asmaidi azisyarlina, Dwi Daud, Anye Gidalti Dayattullah, Muhammad Djayus Djayus, Djayus Fajarwati, Delia Aurora Firdaus, Muhamad Akmal Hadi Kusuma, Mohammad Felik Haryono, Arif Hasani, Ruslan Hendarwati, Emy Khairil Himawan Sadewo, Hengky Julianti, Sri Rezeki Laila, Nor Linda, Fitria Nova Maulana, Ansar Maulana, Risky Maulidsandy, Penta Adenata Mawadah, Anis Mislan Munir, Rahmiati Perkasa Putra Suhartono, Yaumil Ramadiandri Prasetyo, Gaguk Lulus Puspita Sari, Claudia Dewi Rahmiati Rahmiati Ramadana, Muhammad Ramadhan, Adi Buchori Rusmilawati, Depi Sarita, Rahma Sihombing, Jesika Sitorus, Merryana Desidoria Situmeang, Edberg Supriyanto Supriyanto Sutaji Putri, Devina Rayzy Perwitasari Suyitno Suyitno Syam, Ardian Tamarindi Rachman Putr, Galih Adenanthera Wahidah Wahidah