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Journal of Applied Geology
Published by Universitas Gadjah Mada
ISSN : 25022822     EISSN : 25022822     DOI : https://doi.org/10.22146
Core Subject : Science, Social, Engineering,
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Engineering Environmental Science
Journal of Applied Geology – JAG focuses on the applied geology and geosciences with its key objective particularly emphasis on application of basic geological knowledge for addressing environmental, engineering, and geo-hazards problems. The subject covers variety of topics including geodynamics, sedimentology and stratigraphy, volcanology, engineering geology, environmental geology, hydrogeology, geo-hazard and mitigation, mineral resources, energy resources, medical geology, geo-archaeology, as well as applied geophysics and geodesy.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi
Articles 185 Documents
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Radiogenic Heat Variation with Lithology in Clastic Sediments Deduced from Well Logs. An implication for Hydrocarbon Generation: ATG-Field, Niger Delta Basin Sunu, Sebastian Abraham; Kenda, Lucky Peter; Oniku, Adetola Sunday; Meludu, Osita Chukwuemeka; Patrick, Abbey Chukwuemeka; Ahile, Joseph Aza
Journal of Applied Geology Vol 10, No 1 (2025)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.91588

Abstract

This study investigates the variation of Radiogenic heat production (RHP) from four sets of wells logs namely ATG-10, ATG-11, ATG-7, and ATG-5 recorded in clastic sediments of Benin, Agbada and Akata formations in ATG field shallow offshore Niger Delta. Major lithology observed in the gamma ray log was sand, shale and shale-sand intercalations. The variations of radiogenic heat production (RHP) were computed using the total gamma ray count (GR) combined with density logs (RHOB) using the Bucker and Rybach linear methods. Heat production rates calculated was found to vary from 0.23-2.24 µWm-3 ± 0.08 for ATG 10, and 0.22-2.25 µWm-3 ± 0.08 for ATG 11, then 0.31- 2.35 µWm-3± 0.08 for ATG 7 and 0.34-2.33 µWm-3 ± 0.08 for ATG 5. The average radiogenic heat production ranges between 0.9 µWm-3- 2.29 µWm-3. It was observed that high values of radiogenic heat production were in the shale lithology of the Akata formation, and this was as a result of high concentration of radioelements (uranium, Thorium and Potassium) in the sediment. And low values of RHP in sand lithology in the Benin formation and it was as a result of low concentrations of radio elements. The magnitudes of RHP calculated in this study can produce enough heat which may have an effect on the hydrocarbon potential in the clastic sediments of the Niger Delta and also may classify thermal regime and also contributes to the maturation of Kerogen into hydrocarbon in the Niger Delta. Depth versus RHP cross plots showed heat production tends to increase with depth since the basin is underlain by Akata formation and is mainly marine shales. Where spectral gamma ray data are not available, the relationship between RHP Gamma ray and density log established in this study may be used in any part of the Niger Delta to calculate RHP.
Excavation Method of Rock Masses at the Matenggeng Dam, Indonesia Afandi, Valentino Ilham; Indrawan, I Gde Budi; Husein, Salahuddin
Journal of Applied Geology Vol 10, No 1 (2025)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.103735

Abstract

This paper presents the results of engineering geological investigations and determination of rock mass excavation methods in the main dam area of Matenggeng Dam. The study was carried out through engineering geological mapping, core drill evaluation and supported by laboratory test data. Classifications of rock masses were carried out based on the Geological Strength Index (GSI) and Rock Mass Rating (RMR) to analyze the excavation method. The results showed research area consisted of lithology in the form of andesite, intercalation sandstone - gravelly sandstone unit, intercalation sandstone - siltstone unit, and alluvium deposits. However, at the main dam area consists of lithology in the form of intercalation sandstone-siltstone unit and intercalation sandstone-gravelly sandstone unit. The rock masses at the main dam excavation line have a weathering degree from moderately to complately weathered. Intact rocks have Uniaxial Compressive Strength (UCS) values ranging from 1-50 Mpa and are a category of extremly weak to moderate rocks. The rock mass of intercalation sandstone-siltstone with very poor to poor quality (GSI (0 - 58), RMR (8 - 45)), and intercalation sandstone-gravelly sandstone with poor to fair quality (GSI (20 - 59), RMR (20 - 68)). The recommended rock excavation method based on the EXCASS System is diggir, easy ripper, and hard ripper.
Unsupervised Machine Learning for Determining Exploration Areas of Valuable Elements and Potential Toxicology Elements: A Case Study of the Bowen Basin Coal, Australia Addintamma, Fajri Zakka; Amaranggana, Adzani Nareswari; Kusuma, Anindya Ayu; Aviliana, Aviliana; Solikh, Mochammad Wildanun; Patria, Aulia Agus; Anggara, Ferian
Journal of Applied Geology Vol 10, No 1 (2025)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.104595

Abstract

Global coal production and demand have increased anually. In addition to its potential as an alternative source of critical elements, coal also has environmental risks through toxicology elements. Australia is the world’s second-largest producer of rare earth elements (REEs) and critical elements, making coal exploration a key focus of the country’s mining strategy. An unsupervised Machine learning algorithm was applied to 56 coal samples from three pits in Bowen Basin, e.g., Blake Central Pit, Blake West Pit, and Bowen No. 2 Pit, to correlate trace elements with the geochemical characteristics of coal, such as proximate and major oxides. Blake West Pit is enriched in Ba, Br, and Sr, which associated with inherent moisture and phosphor (P), extending SE-trend. Blake Central Pit and Blake West Pit are enriched in Hf, Mo, Ta, Th, Y, and REY, which are associated with ash and major elements such as Si, Al, Ti, and K, with a trend of potential exploration towards N-NW. However, both pits show the risk of contamination from the toxic element Zn, which is associated with volatile matter, and major elements e.g., Fe, Mg, and Mn, with a trend of distribution towards S-SW. Based on the correlation analysis and regional geology, trace element enrichment in Bowen Basin is controlled by two main factors: 1) the transgressive phase during Early-Late Permian, which enriched inherent moisture, P, Ba, Br, and Sr, and 2) volcanic activity during Early Permian, which enriched silicate minerals and elements such as Hf, Ta, Th, W, and REY. Unsupervised machine learning has proven effective for preliminary coal characterization to support further exploration.
Estimation of Strong Ground Motion at Mandalay Region, Myanmar thein, pyi soe; Khaing, Khaing; Lin, Kyi Kyi; Pramumijoyo, Subagyo; Kiyono, Junji
Journal of Applied Geology Vol 10, No 1 (2025)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.105847

Abstract

Mandalay region lies very closed to the dextral Sagaing fault. In the historical record, several earthquakes happened in and around Mandalay region from the beginning of the year of 1400. Among them the most distinct event is the Sagaing earthquake struck on July 16, 1956. This research mainly focuses on results of microtremor survey at 143 sites and 25 data from the boreholes for determination of sediment thickness characteristics and strong ground motion analysis in Mandalay region. For the accurate prediction of earthquake ground motions, the investigation of three elements in its process, namely the source, path, and site effects, is crucial, and their accuracy and reliability should be evaluated. The subsurface profiles, predominant periods, shear wave velocity structures and information about sediment thickness or depth of engineering bed rock were evaluated based on data from boreholes, microtremor survey and laboratory results, combining with inversion program. The shear wave velocity of the top layer is Vs ≤ 190 m/s. The spectral amplitudes of the estimated strong ground motions were smaller at around 0.5 Hz and larger at around 3 Hz in Mandalay region. The peak ground acceleration becomes more than 0.8 g in some areas, which causes severe damage for buildings in high probability.
Improving Landslide Susceptibility Using Groundwater Parameter in Samigaluh and Kalibawang Subdistricts Susatio, Raja; Sartohadi, Junun; Samodra, Guruh; Setiawan, Muhammad Anggri; Wilopo, Wahyu
Journal of Applied Geology Vol 10, No 1 (2025)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.106054

Abstract

Landslide susceptibility map is crucial in disaster risk management and it can be used for regional development plans. Landslide susceptibility map can be made by analyzing parameters that are assumed to affect landslides such as gradient slopes, geology, soil, and climate. Selection of landslide controlling parameters influences the accuracy of landslide susceptibility map. This study evaluates the effect of parameter that’s rarely used which is groundwater. The study area of this research was Kalibawang and Samigaluh Subdistricts, Kulonprogo, Special Region of Yogyakarta, Indonesia. Frequency ratio was used for the method along other parameters which is slope gradient, lithology, lineament density, land use, soil thickness. The result shows that groundwater parameter increase the accuracy by 22,29%. This study suggest that groundwater should be highly considered in landslide susceptibility mapping. In the other hand, groundwater depth mapping remains a challenge because most remote sensing method only detect shallow groundwater. Further research is necessary to develop better method for groundwater mapping using remote sensing or other indirect method.

Page 19 of 19 | Total Record : 185

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