Journal of Geoscience, Engineering, Environment, and Technology <p style="text-align: justify;"><strong>JGEET (Journal of Geoscience, Engineering, Environment, and Technology) </strong>&nbsp;<strong>(E-ISSN&nbsp;: 2541-5794, P-ISSN&nbsp;: 2503-216X )</strong> is a peer-reviewed and open access journal that publishes significant and important research from area of geological science, related with engineering, environment, and technology. We accept submission from all over the world on English language. Editorial Board members are prominent and active researchers in geological sciences and engineering fields who ensure efficient, fair, and constructive peer-review process. All accepted articles will be published and available to all readers with worldwide visibility and coverage. Our Journal already <a href="">indexed </a>in DOAJ, EBSCO, SINTA, GARUDA, Indonesia One Search, Crossref, Index Copernicus, OCLC, BASE, and University Libraries around the world.&nbsp;&nbsp;</p> <p style="text-align: justify;"><strong>ACCREDITED by Ministry of Research, Technology, and Higher Education of the Republic of Indonesia, <a title="Accreditation Certificate" href="" target="_blank" rel="noopener">No.30/E/KPT/2018</a>,&nbsp;October 24, 2018</strong></p> en-US <p>Copyright @2019. This is an open-access article distributed under the terms of the Creative Commons&nbsp;Attribution-ShareAlike 4.0 International License which permits unrestricted use, distribution, and reproduction in any medium.&nbsp;Copyrights of all materials published in JGEET are freely available without charge to users or / institution. Users are allowed to read, download, copy, distribute, search, or link to&nbsp;full-text&nbsp;articles in this journal without asking&nbsp;by giving&nbsp;appropriate credit, provide a link to the license, and&nbsp;indicate if changes were made. All of the&nbsp;remix, transform, or build upon the material must distribute the contributions under the&nbsp;same license&nbsp;as the original.&nbsp;</p> (Husnul Kausarian, Ph.D.) (Adi Suryadi, B.Sc.(Hons)., M.Sc.) Fri, 16 Dec 2022 00:00:00 +0000 OJS 60 Front matter JGEET Vol 07 No 04 2022 <p>&nbsp; &nbsp;&nbsp;</p> JGEET (J. Geoscience Eng. Environ. Technol.) Copyright (c) 2022 Journal of Geoscience, Engineering, Environment, and Technology Fri, 16 Dec 2022 03:27:07 +0000 Evolution Magmatism of Nagasari Volcano Dieng, Central Java, Indonesia <p>Nagasari Volcano, part of the Dieng volcanic complex, is one of the unique volcanoes in Central Java. Around this volcano grow eruption craters, volcanic cones, and pyroclastic flow ridges. There were several 14 eruption centers around Mount Nagasari, so it is necessary to know the development of magmatism evolution. The aims of the research to determine the evolutionary development of magmatism. The methodology used is geological mapping and petrographic analysis. The observations of rocks found in the study area include andesite lava, lapilli-tuff, fallen pyroclastic breccias, and flow pyroclastic breccias. Meanwhile, geological mapping and petrographic observations of volcanic rock samples show that the evolution of magmatism in the study area from the oldest to the youngest is basaltic magma that formed Prau Volcano in the pre-caldera period. On the other hand, magmatism in the post-caldera I period was of the type of pyroxene andesite forming the Gembol to Jimat Volcano group. In contrast, in the post-caldera II period, the hornblende-biotite andesite group formed the Dieng Kulon to Kendil group.</p> Dwi Fitri Yudiantoro, Intan Paramita Haty, Setia Pambudi, Elisabet Magdalena, Armala Putri, I. Takashima, M. Abdurrachman Copyright (c) 2022 Journal of Geoscience, Engineering, Environment, and Technology Thu, 15 Dec 2022 07:49:21 +0000 Rock characteristics of post-caldera volcanoes in Dieng volcanic complex (DVC), Central Java, Indonesia <p>The Dieng volcanic complex (DVC) has one of the densest post-caldera volcanisms activity presents in Indonesia, yet its population density is considerably high. Therefore, it is important to identify the rock characteristics produced by the DVC post-caldera volcanoes to understand the risks and future hazards (i.e., eruption style). Based on lithology, we have classified DVC post-caldera volcanoes as (1) pyroclastic domain (PD; including Pagerkandang, Merdada, and Pangonan), and (2) lava domain (LD; including Prambanan, Kendil, Pakuwaja, Sikunir, Sikarim, and Seroja). PD is characterized by the domination of pyroclastic materials (mostly ash and lapilli) with oxidized scoria and volcanic lithics (fresh and/or altered) as the main components. The oxidized scoria clasts are moderately vesicular (27–41 % vesicularity; ) and phenocryst poor (&lt;5 % phenocryst crystallinity, ), with plagioclase, pyroxene, and oxides as the main phenocryst phases. The LD is composed predominantly of lava. The observed lavas are typically dense (mostly &lt;1 % , phenocryst rich (21–47 % ), and include plagioclase, pyroxene, biotite, amphibole, and oxides as the main phenocryst phases. Such differences in mineralogy and textures (i.e., vesicularity and crystallinity) suggest that PD and LD were likely sourced from different magmatic sources with different eruption styles (explosive and effusive styles, respectively). We have suggested that civilization settlements near PD are facing major threats from explosive magmatic, phreatomagmatic, and phreatic eruptions that could produce significant fallouts, ballistic materials, and highly destructive pyroclastic density currents. LDs pose a threat in the form of effusive magmatic eruptions such as lava flows and/or domes.</p> Indranova Suhendro, Muhammad Nadafa Isnain, Rizky Wahyudi Copyright (c) 2022 Journal of Geoscience, Engineering, Environment, and Technology Thu, 15 Dec 2022 08:39:40 +0000 Estimation of density log and sonic log using artificial intelligence: an example from the Perth Basin, Australia <p>It is well understood that with&nbsp; a large number of data, an excellent interpretation of the subsurface condition can be produced, and also our understandings of the subsurface conditions can be improved significantly. However, having abundant subsurface geological and petrophysical data sometimes may not be possible, mainly due to budget issues. This situation can generate issues during hydrocarbon exploration and/or development activities.</p> <p>In this paper, the authors tried to apply artificial intelligence (AI) techniques to estimate outcomes values of particular wireline log data, using available petrophysic data. Two types of AI were selected and these are artificial neural network (ANN), and multiple linear regression (MLR). This research aims to advance our understanding of AI and its application in geology. There are three objectives of this study: (1) to estimate sonic log (DT) and density log (RhoB) using different types of AI (ANN and MLR); (2) to assess the best AI technique that can be used to estimate certain wireline log data; and (3) to compare the estimated wireline log values with the real, recorded values from the subsurface.</p> <p>Findings from this study show that ANN consistently provided a better accuracy percentage compared to MLR when estimating density log (RhoB). While using different set of data and technique, estimation of sonic log (DT) produced different accuracy level. Moreover, crossplot validation of the results show that the results from ANN analysis produced higher trendline reliability (R<sup>2</sup>) and correlation coefficient (R) than the results from MLR analysis. Comparison of the estimated RhoB and DT log data with the original recorded data shows minor mismatch. This is evident that AI technique can be a reliable solution to estimate particular outcomes of wireline log data, due to limited availability of the original recorded subsurface petrophysic data. It is expected that these findings would provide new insights into the application of AI in geology, and encourage the readers to explore and expand the many possibilities of the application of AI in geology.</p> Muhammad Ridha Adhari, Muhammad Yusuf Kardawi Copyright (c) 2022 Journal of Geoscience, Engineering, Environment, and Technology Thu, 15 Dec 2022 08:58:10 +0000 Identification of Potential Geotourism Destination in the River Subayang areas of Kampar, Riau, Indonesia <p>The readiness of an area to be able to develop tourism potential as geotourism is seen from various aspects, including the existing geological heritage, as well as the enthusiasm of the local community which is the main focus in creating good geotourism, while the government acts as the main mover. In Kampar Regency, Riau Province, to be precise in the Sushadow River area, the Rimbang Balling area located in the Kampar Kiri Hulu sub-district, there are natural attractions that the Subayang river passes through, in addition to the river being so clear, upstream we can find a stone wall waterfall, possibly having a waterfall. This paper, shows the potential of geotourism froum various aspects of geomorphology and community life, such as economic, social, cultural and infrastructure and discusses the role of society and sectors as tourism actors in subayang river using the RAP-fish method. Geotourism studies can be drawn from various integrations of existing theories, conceptual analyzes and practices of nature-based tourism and closer collaboration with relevant social sciences so that they can play a role in the promotion of tourism among the public and professionals.</p> Dwita Martania, Mira Hafizhah Tanjung, Adi Suryadi Copyright (c) 2022 Journal of Geoscience, Engineering, Environment, and Technology Thu, 15 Dec 2022 09:16:44 +0000 The Role of Fractal Micro-Pore to Absorption of Methane Gas, Case Study: Coal of Tanjung Formation, Arang Alus Area, Banjar District, South Kalimantan, Indonesia <p>The Tanjung Formation is one of the coal bearing formations in the Barito Basin, South Kalimantan. The coal seams in the Tanjung Formation in the Arang Alus area have 4 (four) seams,there are seam A, B, C, and D. The age of these coal seams are Eocene - Oligocene with a thickness between 0.5 - 2 meters. This study aims to determine the characteristics of micropore fractal and methane gas absorption from coal samples taken by channel sampling on exposed coal in the open pit. The method used is SEM analysis, vitrinite reflectance (R<sub>o,max</sub>), adsorption isotherm, and fractal calculation. The four coal seams based on vitrinite reflectance values (0.52 %- 0.62 belong to the sub-bituminous rank. Based on the methane gas absorption capacity for coal seam C of 450 SCF/ton while coal seams A, B and D of 308 SCF/ton, 336 SCF/ton and 407 SCF/ton, the fractal pore dimension value in seam coal&nbsp; C = 1.963&nbsp; is higher than seam coal&nbsp; A = 1.933, B = 1.940 , and D = 1.943. The small size of the fractal pore dimension value caused by the degree of regularity of the micropore distribution in each coal seam methane differences.</p> Sugeng Raharjo, Basuki Rahmad, Ketut Gunawan, Budi Prayitno Copyright (c) 2022 Journal of Geoscience, Engineering, Environment, and Technology Thu, 15 Dec 2022 09:47:20 +0000 Characteristics and Potential of Placer Gold Deposit in Lakan Bilem Block, West Kutai District, East Kalimantan, Indonesia <p>Kalimantan is recognized as one of Indonesian islands with huge prospect of minerals particularly gold both primary and secondary deposit styles. However, the publication of the gold resources is still restricted to be described in regional/district scale maps or exploration company internal reports, hence, a detailed study on deposit scale remains limited. This study is aimed to document the characteristics and the estimation of potential or resources of the secondary (placer) gold deposit in Lakan Bilem block, West Kutai district, East Kalimantan province, Indonesia. The study was done by field observation followed by microscopic analysis and simple resources estimation of the gold. Gold in the study area occur in the semi-consolidated paleo alluvial deposit as trace mineral. The gold morphologies show platy to angular form with coarse surface which indicates the process of gold deposition is predominantly controlled by hydrodynamic transportation at a relatively moderate regime. Estimation of the indicated resources of gold results a total of 4.96 tonnes of gold potentially occurred in the study area. Exploration drilling with 100 spacing grid is suggested to delineate lateral and vertical distribution of the gold deposit. The drilling also will upgrade confidence level of the resources from indicated to measured resources.</p> Arifudin Idrus, Ni’matul Azizah Raharjanti, Sufriadin Copyright (c) 2022 Journal of Geoscience, Engineering, Environment, and Technology Fri, 16 Dec 2022 01:49:29 +0000 Economic Feasibility Analysis of Fishing Job Operation in Well YS13 <p>Oil consumption in Indonesia has increased from year to year. However, the increasing demand for oil and natural gas is inversely proportional to oil and gas production, which always declines from year to year. One of the factors causing the decline in production is the well damage. Well YS13 is a well that is damaged in the form of fish in the well. A fishing job is the most appropriate option to solve the problem of the presence of fish in the well because the fish in the well must be removed to continue well production activities or drilling activities. This study aimed to determine the economic feasibility of fishing job activities to be carried out at the YS13 well. The research begins with the preparation of the required data, then calculate the predicted production of the YS13 well with the decline curve method, estimates the cost of the fishing job, and economic fishing time (EFT). And determines the economic feasibility of the fishing job project by calculating profit indicators, namely Net Present Value (NPV), Internal Rate of Return (IRR), and Pay Out Time (POT). The results of calculations using the decline curve method obtained that the total production for 20 months is 4293.52 bbl. The EFT value is 3 days with Ps = 10% and the total cost of fishing is $28.657,70. The economic value of the project with discount rate = 12%, MARR = 12%, NPV = $147.367,20, IRR = 114%, and POT = 1.44. From the results of the calculation of the economic feasibility, the project is considered feasible to be carried out.</p> Muhammad Ariyon, Bella Santika, Fitrianti Copyright (c) 2022 Journal of Geoscience, Engineering, Environment, and Technology Fri, 16 Dec 2022 02:08:05 +0000 Control Structure On Damage Zone and Fault Plane to Geometry Of Quartz Veins and Calcite In Muaradua Ogan Komering Ulu Selatan, South Sumatra, Indonesia <p>Geological mapping was carried out on the Gilas and Malau rivers in the Muaradua area, South Ogan Komering Ulu Regency, South Sumatra by observing the presence of joints, faults, and veins in the granite and phyllite rock outcrops of the Tarap Formation. Research on pattern geometry and vein type in the crushing zone is focused on measuring the direction (trend) of veins and joints. The measurement results are then analyzed to obtain a general pattern of quartz and calcite veins so that the orientation of their development can be known. The method used in this study is in the form of determining the orientation and geometry of the veins based on classifications that refer to several studies, then an analysis is carried out using DemNAS data to determine the general direction of the straightness pattern of the study area. The quartz veins that developed in the study area have an extensional fracture type with the geometry found in the form of isolated, abutting, cutting, mutually-cutting, and crosscutting. The veins that develop in the research area are relatively north-south and west-east and indicated the presence of a fault and traces of deformation that occurred in the study area. With the help of veins and joints found in the study area, it is possible to determine the structural control of the presence of a crushing zone in the fault plane.</p> Budhi Setiawan, Pratama Goestyananda Copyright (c) 2022 Journal of Geoscience, Engineering, Environment, and Technology Fri, 16 Dec 2022 02:54:26 +0000 Back matter JGEET Vol 07 No 04 2022 <p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</p> JGEET (J. Geoscience Eng. Environ. Technol.) Copyright (c) 2022 Journal of Geoscience, Engineering, Environment, and Technology Fri, 16 Dec 2022 03:34:52 +0000