cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Rahmiati
Contact Email
rahmiati@fmipa.unmul.ac.id
Phone
+6281355258687
Journal Mail Official
kutaibasin@fmipa.unmul.ac.id
Editorial Address
Jalan Barong Tongkok No.4 Gunung Kelua Samarinda, East Kalimantan Province Indonesia - 75123
Location
Kota samarinda,
Kalimantan timur
INDONESIA
Geosains Kutai Basin
Published by Universitas Mulawarman
ISSN : -     EISSN : 26155176     DOI : https://doi.org/10.30872/geofisunmul.v5i2
Core Subject : Science,
Earth & Planetary Sciences
Coastal and Ocean Dynamics Environmental of Geophysics Geodesy and Geography Geographic Information System Geology Geophysics Exploration Geotechnical/ geo-engineering Hazard Mitigation Hydrology Meteorology and Climatology Mining Engineering Seismology and Volcanology Oceanography
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geofisika
Articles 114 Documents
 2   3   4   5   6 
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.
Numerical Study of Hydrodynamics in the waters of Balikpapan Bay using Finite Volume Method Rahman, Suci Erniya; Yusuf, Mustaid; Nasution, Yuki Novia
GEOSAINS KUTAI BASIN Vol 5 No 1 (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.v5i1.793

Abstract

Suci Erniya Rahman. 2021. Numerical Study Hydrodynamic in the waters of Balikpapan Bay using Finite Volume Method. Supervised by Dr. Sc. Mustaid Yusuf, M.Si. and Yuki Novia Nasution, S.Si., M.Sc. Faculty of Mathematics and Natural Sciences, Mulawarman University. The hydrodynamic model FVCOM (Finite Volume Coastal Ocean Model) using the approach method finite volume has been applied to determine the distribution of tidal current patterns in the Balikpapan Bay area. The simulation was carried out for 30 days using river discharge and tides as generating forces. The simulation results has verified by using the Root Mean Square Error (RMSE) method on observation data in the Balikpapan Bay area. The results of the simulation and observation verification have a good agreement, which is 0.09917 meters. The smaller (closer to zero) RMSE value, is the better results of the observation and simulation match. The results of study showed that the pattern and average current velocity in Balikpapan Bay for 15 days (11-26 October 2012) was dominant out of the bay.
IDENTIFIKASI LAPISAN AKUIFER AIR TANAH DENGAN MENGGUNAKAN METODE GEOELEKTRISITAS KONFIGURASI SCHLUMBERGER DI TAMAN SALMA SHOFA SAMARINDA, KALIMANTAN TIMUR Rezky, Bayu; Mandang, Idris
GEOSAINS KUTAI BASIN Vol 2 No 2 (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.v2i2.472

Abstract

The geoelectric method is one of the geophysical methods. It studies the electrical properties on earth and detects on the surface of the earth. In this case includes the measurement of potential, currents and electromagnetic fields that occur either naturally or due to injection of current into the earth. This research was conducted at Salma Shofa garden. Geographically, the location of Salma Shofa Garden is located at 117° 12' 43.0326" E, 0° 28' 40.0238" S to 117° 13' 14.1068" E, 0° 29' 06.5236" S. In the two line was measured to obtain the values of apparent resistivity (ρa) this using the Schlumberger array. These values are processed by the IPI2win program to obtain 1-D from each line. The results of geoelectric modeling indicate the deep of ground water. The resistivity values in line 1 is 49.2Ω.m-51.8 Ω.m. and 49.2Ω.m-51.8Ω.m in line 2.
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.
IDENTIFIKASI LAPISAN PENYEBAB LONGSOR MENGGUNAKAN GROUND PENETRATING RADAR AREA MONUMEN PESAWAT SANGATTA PT. KALTIM PRIMA COAL Marbun, Meyliza Cronika; Supriyanto, Supriyanto; Rinaldi, Aditya
GEOSAINS KUTAI BASIN Vol 3 No 2 (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.v3i2.692

Abstract

A landslide is an event where a mass of rock, soil or a mixture of rock and soil are moved as a slope. One of the mechanical properties that can be a trigger of landslides is the reduction in rock shear strength. In this research, the authors used the Geophysical method that is Ground Penetrating Radar (GPR), by utilizing different dielectric properties of rocks when given electromagnetic wave propagation to see the amplitude contrast in the recorded data as an approach to the type of rock lithology and rock layers below the soil surface so that it can be used to identify layers that cause landslides. The frequency of GPR that used in this research is 40 MHz. The research aims to determine the type of layer that causes landslides in the area of ​​Sangatta Aircraft Monument, PT. Kaltim Prima Coal. The results of this research are in the form of GPR data which is correlated with the carrying capacity of the soil so that the avalanche causing layer in the study area is sandy clay layer.
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.
The Identifikasi Delineasi Oli Berdasarkan Nilai Resistivitas Menggunakan Metode Geolistrik Di Area “X” Tana Tidung, Kalimantan Utara Wibowo, Nobella Hadi; Djayus, Djayus; Supriyanto, Supriyanto
GEOSAINS KUTAI BASIN Vol 6 No 1 (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.v6i1.1043

Abstract

Waste pollution is a problem that must be addressed immediately. Apart from affecting the air and waters, sewage pollution can also seep below the ground surface. One of the causes of waste pollution in area "X" is the leakage of the oil storage tank by the PLTD (Diesel Power Plant) operational system in that area. This leak causes oil droplets to be absorbed into the pores of the soil and into the subsurface where it settles. To find out whether remnants of oil seepage remained in area "X" a study was conducted using the resistivity geoelectric method. The research was carried out in 2 ways, namely processing in 2 and 3 dimensions and using coring samples as a comparison of resistivity values. There were 6 coring sampling points (interval variation of 7 parts of depth) used in the study, namely coring A, B, C, D, E and F. From the six samples, an average resistivity value of 2.637 Ωm is obtained at a depth of 0-30 cm . Furthermore, at a depth of 100-130 cm it has an average resistivity value of 2.702 Ωm, at a depth of 200-230 cm it has an average resistivity value of 3.510 Ωm, at a depth of 300-330 cm it has an average resistivity value of 1.862, at a depth of 400- 430 cm has an average resistivity value of 1.928 Ωm, at a depth of 500-530 cm has an average resistivity value of 1.610 Ωm and at a depth of 600-630 cm has an average resistivity value of 1.637 Ωm. The results of this study indicate that soil contaminated with waste oil has a lower resistivity, which is in the range of 2.30 Ωm to 3.76 Ωm.
ANALISIS STRUKTUR TANAH PADA MATA AIR DUSUN SALENRANG KAWASAN KARST KABUPATEN MAROS Sulistiawaty, Sulistiawaty; Arsyad, Muhammad; Ihsan, Nasrul
GEOSAINS KUTAI BASIN Vol. 1 No. 1 (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.v1i1.162

Abstract

Daerah karst yang berada di Dusun Salenrang Desa Rammang-rammang Kabupaten Maros terdapat mata air pertemuan antara air asin dan air tawar yang tidak saling bercampur satu sama lain yang digunakan masyarakat sebagai salah satu sumber air bersih pada saat musim kemarau. Berdasarkan hal tersebut maka penelitian dilakukan guna mengetahui komposisi mineral dari tanah pertemuan air asin dan air tawar di Dusun salenrang serta pada mata air Ma’rung, dengan cara mengkarakterisasi sampel tanah dengan menggunakan alat XRD (X-Ray Diffraction) dan SEM-EDS (Scanning Electron Microscopy-Electron Dispersive Spectroscopy). Adapun hasil uji SEM-EDS diperoleh adalah silikon, aluminium, dan besi, dimana molar oksida besi yang terbentuk yaitu SiO2, Al2O3 dan FeO, serta struktur yang terbentuk dominan adalah monoklinik. Sedangkan berdasarkan uji XRD diperoleh hasil dari kedua sampel tanah adalah berbentuk kristal, dimana dominan komposisinya adalah sanidine.

Page 4 of 12 | Total Record : 114

 2   3   4   5   6 

Filter by Year

2018 2026


Reset
Filter By Issues
All Issue Vol. 9 No. 1 (2026) Vol. 8 No. 2 (2025) Vol. 8 No. 1 (2025) Vol. 7 No. 2 (2024) Vol. 7 No. 1 (2024) Vol. 6 No. 2 (2023) Vol 6 No 1 (2023) Vol 5 No 2 (2022) Vol 5 No 1 (2022) Vol 4 No 2 (2021) Vol 4 No 1 (2021) Vol 3 No 2 (2020) Vol 3 No 1 (2020) Vol 2 No 2 (2019) Vol 2 No 1 (2019) Vol 1 No 2 (2018) Vol. 1 No. 1 (2018) More Issue