Articles
<![CDATA[Identifikasi Keberadaan Zona Potensi Air Tanah di Perumahan GAR Menggunakan Metode Geolistrik Resistivitas ]]>
<![CDATA[Zakia Masrurah]]>;
<![CDATA[Rivina Annisa]]>;
<![CDATA[Amsir]]>;
<![CDATA[Wahidah]]>;
<![CDATA[Nurul Azmi Harun]]>
<![CDATA[ Jurnal Rekayasa Geofisika Indonesia Vol. 6 No. 02 (2024): Edisi Agustus JRGI (Jurnal Rekayasa Geofisika Indonesia) ]]>
Publisher : <![CDATA[Program Studi Teknik Geofisika FITK UHO ]]>
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DOI: 10.56099/jrgi.v6i02.94
<![CDATA[The GAR (Grand Aceh Residence) housing estate is located in Baet Village, Aceh Besar District and was constructed on the land of a pond that has been filled in and is close to the coast. The majority of residents use clean water sources from PDAM because of the difficulty of obtaining clean water. The purpose of the research was to identify potential groundwater zones and determine the conditions. The research method used was electrical resistivity method, SuperSting R8/IP with Wenner-Schlumberger configuration. The research was conducted in 3 lines with 6 m spacing. RES2DINV software based on the least square inversion approach was used for data processing. The results obtained show resistivity values varying from 0.1 - 100 Ohm.m with a depth penetration of up to 28.8m. There are 3 lithological layers obtained, namely clay (0.1 - 1.5 Ohm.m), clayey sand (1.5 - 17.7 Ohm.m), and sand (17.7 - 100 Ohm.m). The groundwater presence zone is assumed to be in the sand layer. There are 2 types of groundwater obtained, which are shallow groundwater (phreatic) located from the center to the north of the lines to a depth of ± 13 m and deep groundwater, located varies in the middle of the lines from a depth of ± 15 m to the end with groundwater conditions may still be brackish due to the influence of seawater intrusion with a resistivity value of 0.1 Ohm.m identified to a depth of ± 25 m]]>
<![CDATA[Studi Identifikasi Sebaran Ion Logam Pb, Cu, As dan Cd pada Air dan Sedimen di Perairan Bontang Kalimantan Timur Menggunakan Metode Kriging (Ordinary Kriging) ]]>
<![CDATA[ani, ani ani]]>;
<![CDATA[Wahidah, Wahidah]]>;
<![CDATA[Mandang, Idris]]>
<![CDATA[ GEOSAINS KUTAI BASIN Vol 6 No 1 (2023) ]]>
Publisher : <![CDATA[Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University ]]>
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DOI: 10.30872/geofisunmul.v6i1.1001
<![CDATA[Bontang is one of the cities in East Kalimantan which is geographically located in coastal areas so that it is very vulnerable to marine pollution both from domestic human and industrial activities. This study aims to determine the level and pattern of distribution of poluton metal ions Pb, Cu, As and Cd in water and sediments in Bontang waters using the Kriging (Ordinary Kriging) method. In this study, 4 observation samples were used which were tested in the laboratory to determine the content of heavy metals. Furthermore, the data from laboratory tests along with 4 secondary data were interpolated using the ordinary kriging method with an exponential model to determine the pattern of contour distribution in Bontang waters. The results showed that the heavy metal with the highest distribution value in water and sediment is cadmium with a susceptibility value ranging from 0.006 mg/l to 9.070 mg/l. In general, the pattern of spread of heavy metals originates from coastal areas in a southeasterly direction. The most influential thing on this pattern of spread is tidal currents and bathymetry.]]>
<![CDATA[Perbandingan Nilai Resistivitas Menggunakan Metode Logging Resistivitas Listrik dan Electrical Resistivity Tomography (ERT) ]]>
<![CDATA[Antony, Nurvani]]>;
<![CDATA[Lepong, Piter]]>;
<![CDATA[Wahidah, Wahidah]]>; Supriyanto, Supriyanto;
<![CDATA[Djayus, Djayus]]>
<![CDATA[ GEOSAINS KUTAI BASIN Vol. 6 No. 2 (2023) ]]>
Publisher : <![CDATA[Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University ]]>
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DOI: 10.30872/geofisunmul.v6i2.1094
<![CDATA[Metode geolistrik sering digunakan untuk menginterpretasikan lapisan bawah permukaan yang dangkal. Namun dalam kenyataannya, metode ini memberikan pengukuran resistivitas bawah permukaan yang berbeda dengan metode log resistivitas. Selain itu, metode ini memiliki kelemahan dalam membaca lapisan tipis saat kedalaman pengukuran bertambah. Oleh karena itu, dilakukan penelitian ini untuk membandingkan metode geolistrik dan log resistivitas, serta menentukan faktor-faktor yang menyebabkan perbedaan pengukuran tersebut. Penelitian ini menggunakan data sekunder yang nantinya diolah menggunakan software tertentu. Data geolistrik diolah menggunakan Res2DINV untuk memperoleh penampang resistivitas 2D. Kemudian data log resistivitas diolah menggunakan WellCAD untuk memperoleh kurva resistivitas. Kedua hasil tersebut digabungkan dalam satu gambar untuk dibandingkan dan dianalisis perbedaannya. Hasil yang diperoleh menunjukan bahwa nilai resistivitas semu yang ditampilkan penampang geolistrik lebih kecil dibandingkan kurva resistivitas milik log resistivitas. Selain itu, terdapat sedikit perbedaan interpretasi antara keduanya, dimana metode geolistrik tidak dapat membaca lapisan tipis yang cukup dalam, seperti batubara, dan metode log resistivitas tidak dapat membaca lapisan clay.]]>
<![CDATA[Analisis Potensi Swabakar (Self-Combustion) Berdasarkan Data Proksimat pada Batubara PT. Geoservices Samarinda ]]>
<![CDATA[Wahidah, Wahidah]]>;
<![CDATA[Fajarwati, Delia Aurora]]>;
<![CDATA[Lepong, Piter]]>;
<![CDATA[Alamsyah, Andi]]>
<![CDATA[ GEOSAINS KUTAI BASIN Vol 5 No 2 (2022) ]]>
Publisher : <![CDATA[Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University ]]>
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DOI: 10.30872/geofisunmul.v5i2.1062
<![CDATA[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.]]>
<![CDATA[Penentuan Litologi Batuan di Daerah Samboja Berdasarkan Analisis Pemodelan 3D Data Cutting dan Data Logging Geofisika ]]>
<![CDATA[Situmeang, Edberg]]>;
<![CDATA[Djayus, Djayus]]>;
<![CDATA[Wahidah, Wahidah]]>; Supriyanto, Supriyanto;
<![CDATA[Lepong, Piter]]>
<![CDATA[ GEOSAINS KUTAI BASIN Vol. 6 No. 2 (2023) ]]>
Publisher : <![CDATA[Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University ]]>
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DOI: 10.30872/geofisunmul.v6i2.1087
<![CDATA[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.]]>
<![CDATA[Subsurface Characterization using Electrical Resistivity Tomography (ERT) for Sponge City Planning in Nusantara Capital City (IKN), Indonesia: Karakterisasi Bawah Permukaan Menggunakan Geolistrik Resistivitas (ERT) untuk Perencanaan Kota Spons di Ibu Kota Nusantara (IKN), Indonesi ]]>
<![CDATA[Wahidah, Wahidah]]>;
<![CDATA[Lepong, Piter]]>; Supriyanto, Supriyanto;
<![CDATA[Djayus, Djayus]]>;
<![CDATA[Firdaus, Muhamad Akmal]]>;
<![CDATA[Azisyarlina, Dwi]]>
<![CDATA[ JURNAL GEOCELEBES Vol. 9 No. 2: October 2025 ]]>
Publisher : <![CDATA[Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar ]]>
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DOI: 10.70561/geocelebes.v9i2.47083
<![CDATA[Clay shale dominates the lithology along access roads in the IKN development area. Its impermeable nature poses challenges to implementing the Sponge City concept, which relies on enhanced rainwater absorption to reduce surface runoff. This study aims to map the spatial distribution of clay shale and assess its implications for Sponge City planning. The geoelectrical resistivity method was applied at three sites, each consisting of one long section and three cross sections. Resistivity contrasts were used to delineate subsurface lithology, producing two- and three-dimensional models. The results reveal three main lithological units: topsoil, clay shale, and sandy clay. Topsoil shows heterogeneous resistivity values with thicknesses ranging from <1 m to 5 m. Clay shale exhibits resistivity values below 50 Ωm and thicknesses of <5–30 m, while sandy clay exceeds 50 Ωm with variable thicknesses up to 30 m. The thick, low-resistivity clay shale indicates poor permeability, which limits infiltration and groundwater storage. These findings suggest that the IKN area is less suitable for a natural sponge system. Therefore, stormwater management should prioritize engineered solutions such as green roofs, retention ponds, and bioretention facilities to control runoff and support sustainable urban development.]]>
<![CDATA[Subsurface Characterization using Electrical Resistivity Tomography (ERT) for Sponge City Planning in Nusantara Capital City (IKN), Indonesia: Karakterisasi Bawah Permukaan Menggunakan Geolistrik Resistivitas (ERT) untuk Perencanaan Kota Spons di Ibu Kota Nusantara (IKN), Indonesi ]]>
<![CDATA[Wahidah, Wahidah]]>;
<![CDATA[Lepong, Piter]]>; Supriyanto, Supriyanto;
<![CDATA[Djayus, Djayus]]>;
<![CDATA[Firdaus, Muhamad Akmal]]>;
<![CDATA[Azisyarlina, Dwi]]>
<![CDATA[ JURNAL GEOCELEBES Vol. 9 No. 2: October 2025 ]]>
Publisher : <![CDATA[Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar ]]>
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DOI: 10.70561/geocelebes.v9i2.47083
<![CDATA[Clay shale dominates the lithology along access roads in the IKN development area. Its impermeable nature poses challenges to implementing the Sponge City concept, which relies on enhanced rainwater absorption to reduce surface runoff. This study aims to map the spatial distribution of clay shale and assess its implications for Sponge City planning. The geoelectrical resistivity method was applied at three sites, each consisting of one long section and three cross sections. Resistivity contrasts were used to delineate subsurface lithology, producing two- and three-dimensional models. The results reveal three main lithological units: topsoil, clay shale, and sandy clay. Topsoil shows heterogeneous resistivity values with thicknesses ranging from <1 m to 5 m. Clay shale exhibits resistivity values below 50 Ωm and thicknesses of <5–30 m, while sandy clay exceeds 50 Ωm with variable thicknesses up to 30 m. The thick, low-resistivity clay shale indicates poor permeability, which limits infiltration and groundwater storage. These findings suggest that the IKN area is less suitable for a natural sponge system. Therefore, stormwater management should prioritize engineered solutions such as green roofs, retention ponds, and bioretention facilities to control runoff and support sustainable urban development.]]>
<![CDATA[Application of Seismic Refraction Tomography in Determining the Soil Hardness Level in IKN Nusantara Area ]]>
<![CDATA[Alamsyah, Andi]]>;
<![CDATA[Lepong, Piter]]>;
<![CDATA[Wahidah, Wahidah]]>;
<![CDATA[Rahmiati, Rahmiati]]>
<![CDATA[ JURNAL GEOCELEBES Vol. 8 No. 1: April 2024 ]]>
Publisher : <![CDATA[Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar ]]>
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DOI: 10.20956/geocelebes.v8i1.32159
<![CDATA[Numerous studies supporting infrastructure construction are currently underway in the New Capital Territory of Nusantara (IKN Nusantara). A geophysical method known as Seismic Refraction Tomography (SRT) has been employed within the IKN Nusantara to identify hard and soft layers based on the P-wave velocity (Vp). The data acquisition involved 24 channels of geophone spaced at intervals 3 and 4 meters. Measurements were conducted alongfour trajectories of 69 and 92 meters, reaching penetration depths of 12 – 20 meters. P-wave velocity values ranging between 200 – 3500 m/s were recorded. Additionally, the Unconfined Compressive Strength (UCS) value was determined using an empirical equation tailored for mudrock-shale lithology, establishing the correlation between Vp and UCS. In the shallow depths of 0 – 3 meters, UCS values indicated levels below 20 MPa, classifying the materials as having low to medium hardness. However, at depths greater than 3 meters, this layer transitioned to material with high hardness levels, as evidenced by UCS rate exceeding 20 MPa across all trajectories. This suggest that the IKN Nusantara is conducive to infrastructure development.]]>
<![CDATA[Predicting the Distribution of CO2 Impurities in Hydrocarbons: Seismic Reservoir Characterization in the Northern South Sumatera Basin ]]>
<![CDATA[Rahmawati, Ricky]]>;
<![CDATA[Wahidah, Wahidah]]>;
<![CDATA[Alamsyah, M Noor]]>;
<![CDATA[Hamdani, Dadan]]>;
<![CDATA[Alamsyah, Andi]]>
<![CDATA[ JURNAL GEOCELEBES Vol. 9 No. 1: April 2025 ]]>
Publisher : <![CDATA[Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar ]]>
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DOI: 10.70561/geocelebes.v9i1.34399
<![CDATA[An oil and gas field containing less than 50% carbon dioxide (CO₂) impurities is considered economically viable. This study focuses on the 'X' area, located in the northern part of the South Sumatra Basin, and evaluates the sensitivity of elastic parameters—specifically P-impedance and Vp/Vs ratio—to hydrocarbon presence. Additionally, the study assesses the distribution of sandstone reservoirs within the Lower Talang Akar Formation (LTAF) using seismic reservoir characterization methods, while also analyzing the spatial correlation of natural CO₂ impurities. Using data from 11 wells equipped with S-wave logs, a multi-attribute analysis was applied to predict reservoir properties in 57 additional wells. Sensitivity analysis of hydrocarbons, reservoir, and non-reservoir zones was then conducted using elastic log parameters. Seismic attributes such as variance and ant tracking were utilized to detect fault patterns and potential fractures. Moreover, Relative Acoustic Impedance maps—based on negative and minimum amplitude summations—were generated to visualize sandstone reservoir distribution and CO₂ impurity saturation derived from well tests. Results show that hydrocarbons exhibit greater sensitivity to the Vp/Vs ratio than to P-impedance, although sandstone reservoirs generally display low P-impedance values. Faults in the LTAF surface trend north-south, northwest-southeast, and northeast-southwest, with the highest density in the eastern region of area 'X'. Thick sandstone reservoirs are predominantly found in the northern, southern, western, and southeastern sectors. CO₂ saturation trends decrease westward, aligning with reservoir presence and fracture intensity. Zones with thick reservoirs and low CO₂ levels are identified as key targets for future exploration and development.]]>
