Journal of Earth and Marine Technology (JEMT)最新文献

{"title":"Stability Analysis of Evasion Tunnels Using the Rock Tunneling Quality Index (Q-System) Method On the Construction of the Bagong Dam Trenggalek, East Java","authors":"Revi Eka Wardhany, Sapto Heru Yuwanto","doi":"10.31284/j.jemt.2022.v3i1.3380","DOIUrl":"https://doi.org/10.31284/j.jemt.2022.v3i1.3380","url":null,"abstract":"The Bagong Dam evasion tunnel is part of the dam construction which functions to drain the water flow so that the dam work can be done. In planning the construction of evasive tunnels, it is necessary to study the geological, geotechnical and structural conditions of the tunnel. This study is intended to provide an overview of the subsurface and engineering geological conditions of the research area, so as to determine the stability of the evasion tunnel and then provide recommendations for the support to be used. The method used is the Rock Tunneling Quality Index (Q-System) method to determine the buffer to be used in the construction process. Based on the analysis of the subsurface geological conditions of the study area, there are three rock layers, namely: sandstone, breccia and limestone. In the Q-System analysis, the rock mass class value ranges from 0.451 to 0.651 with Very Poor quality and the rock mass class value is 1.162 with Poor quality. At the four drill points BH-09, BH-03, BH-10 and BH-11, the recommendation for support is obtained with the type of support (B+5) and SRF+B","PeriodicalId":363304,"journal":{"name":"Journal of Earth and Marine Technology (JEMT)","volume":"220 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122934932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Architecture Elements of the Lemat Formation of the Lubuk Bernai Region, Batang Asam District, Tanjung Jabung Barat Regency, Jambi Province","authors":"Sapto Kis Daryono, S. Sutanto, C. Prasetyadi, E. Paripurno","doi":"10.31284/j.jemt.2022.v3i1.3396","DOIUrl":"https://doi.org/10.31284/j.jemt.2022.v3i1.3396","url":null,"abstract":"The study of facies analysis and interpretation of the depositional environment of the Lemat Formation located at Bukit Tiga Puluh aims to clarify the problems found in Paleogene sediments in the South Sumatra Basin. A detailed analysis of the fluvial facies has been carried out in the Lubuk Bernai track. A number of observations, profiling, and measured stratigraphic section have been carried out. The stratigraphy of the study area can be divided into 5 units from old to young, namely the Mentulu-metamorphic sandstone unit, Lemat conglomerate unit, Lemat gravel-sandstone unit, Benakat volcanic-siltstone unit, and the alluvial deposit unit. The stratigraphic relationship between Mentulu metamorphic-sandstone unit and Lthe emat conglomerate unit is nonconformity. The relationship between Lthe emat conglomerate unit and Lemat gravel-sandstone unit and Benakat volcanic-siltstone unit is interfingering. The relationship between alluvial deposit units with Lemat conglomerate units and Lemat gravel-sandstone units is aan ngular unconformity. Analysis of lithofacies and architectural elements of the study area showed a fluvial depositional environment. The resulting architectural elements are 8 associations: SG (sedimentary gravity flow), GB (gravel bedform), SB (sandy bedform), CH (channel), DA (downstream accretion), HO (scour-hollow fill), AC (abandoned channel) and FF (overbank fine). The depositional environment of the Lemat Formation; Lemat conglomerate unit in alluvial fans environment, Lemat gravel sandstone unit in the shallow environment, gravel-bed braided river. In the Benakat tuffaceous-siltstone unit, it was deposited in a flashy, ephermal, sheet flood, sand-bed river environment.","PeriodicalId":363304,"journal":{"name":"Journal of Earth and Marine Technology (JEMT)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122577732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Calculation of coal resources and reserves using the cross-section method in the mining plan area of PT. Sentosa Prima Coal in Mersam District, Batang Hari District, Jambi","authors":"Muhammad Jundi Haikal Azis, Yazid Fanani","doi":"10.31284/j.jemt.2022.v3i1.3603","DOIUrl":"https://doi.org/10.31284/j.jemt.2022.v3i1.3603","url":null,"abstract":"PT. Sentosa Prima Coal is a company engaged in the Coal sector. This company is located in Mersam District, Batanghari Regency, Jambi Province. The area of the mining business permit of PT. Sentosa Prima Coal of 2000 Ha. Mining activities require reserve calculations before mining activities are carried out, including making a coal deposit model, calculating coal resources, pit design, calculating coal reserves, and calculating the stripping ratio (SR) value, so that later the number of coal reserves can be obtained and obtain a deposit model. The modeling and calculation of reserves were carried out using the \"cross-section\" with the help of Surpac 6.6.2 software. Based on the Cross Section's estimation results, coal resources for PT. Sentosa Prima Coal amounted to 8,073,932 tons, and coal reserves 6,662,514 tons, the volume of Overburden for the planned mining activity area was 24,779,981 BCM, and the stripping ratio value was obtained 1:4.","PeriodicalId":363304,"journal":{"name":"Journal of Earth and Marine Technology (JEMT)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124783501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reanalysis LUSI Stratigraphic Based on Cutting of Banjarpanji#1 Well","authors":"H. T. Wibowo, B. Prastistho, C. Prasetyadi, D. Yudiantoro","doi":"10.31284/j.jemt.2022.v3i1.3602","DOIUrl":"https://doi.org/10.31284/j.jemt.2022.v3i1.3602","url":null,"abstract":"The subsurface configuration or stratigraphy of the Sidoarjo Hot Mudflow (Lumpur Sidoarjo/LUSI) is used to see what formations are transported out and how the material properties can be known from the well log data of Banjarpanji#1 or BJP#1 well. There is something unusual about the BJP#1 log, namely the presence of solid volcanic sandstone at a depth of 6000-9297 ft where drilling ended. This abnormality was investigated by reanalyzing volcanic sandstone by reading the well log data which is drilling data during the exploration of the Banjarpanji-1 well by PT. Lapindo Brantas, Inc. which consists of rock logs as a result of predictions (prognosis) and facts found (actual) were then compared with the interpretation of the results of the investigation team with BP MIGAS 2006 which was then confirmed by petrographic and paleontological analysis. The unusual occurrence is the LUSI stratigraphic arrangement changes based on findings in volcanic sandstone sequences that were once considered part of the Kalibeng Formation of Plio-Pliestocene age, then changed to solid volcanic sandstone units of Middle Miocene age with a depositional environment in the outer neritic-upper bathyal.","PeriodicalId":363304,"journal":{"name":"Journal of Earth and Marine Technology (JEMT)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126320173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Facies and architectural analysis of Paleogen fluvial deposits of the measured section of Rambangnia and Air Napalan Rivers in Palembang Sub-basin","authors":"Sapto Kis Daryono, C. Prasetyadi, E. Paripurno, S. Sutanto, Aditya Zaenalfi Faozi","doi":"10.31284/j.jemt.2022.v3i1.3606","DOIUrl":"https://doi.org/10.31284/j.jemt.2022.v3i1.3606","url":null,"abstract":"Paleogene fluvial deposits have an important problem as pre-rift deposits, which occur before or at the same time as the formation of the basin. The research results on facies analysis and interpretation of the depositional environment of Paleogene deposits located in the Garba Hills will later explain and describe the history of the formation and stratigraphic evolution of sedimentary rocks in the South Sumatra Basin, reflected in the lithological and facies characteristics. The facies analysis was carried out on a stratigraphic cross-section with a thickness of ± 107.37 meters and ± 11.06 meters on the measurement path of the Rambangnia River and Air Napalan River, which are located in the Ogan Komering Ulu area, South Sumatra. Seven lithofacies developed on two measured paths are matrix supported gradded gravel (Gmg), gravel matrix supported Massive (Gmm), through cross-bedded (St), massive sandstone (Sm), horizontally bedded sandstones (Sh), parallel laminated siltstone and claystone (F1), massive siltstones and mudstones (Fsm). Asosiasi fasies didapatkan berupa Sedimentary Gravity Flow (SG), Gravel Bars (GB), Sandy Bedforms  (SB), channel (CH), Overbank fine  (FF). The interpretation of the depositional environment shows a fluvial environment, the type of braided river with a gravel braided rivers model with sedimentary gravity flows.Paleogene fluvial deposits have an important problem as pre-rift deposits, which occur before or at the same time as the formation of the basin. The research results on facies analysis and interpretation of the depositional environment of Paleogene deposits located in the Garba Hills will later explain and describe the history of the formation and stratigraphic evolution of sedimentary rocks in the South Sumatra Basin, reflected in the lithological and facies characteristics. The facies analysis was carried out on a stratigraphic cross-section with a thickness of ± 107.37 meters and ± 11.06 meters on the measurement path of the Rambangnia River and Air Napalan River, which are located in the Ogan Komering Ulu area, South Sumatra. Seven lithofacies developed on two measured paths are matrix supported gradded gravel (Gmg), gravel matrix supported Massive (Gmm), through cross-bedded (St), massive sandstone (Sm), horizontally bedded sandstones (Sh), parallel laminated siltstone and claystone (F1), massive siltstones and mudstones (Fsm). Asosiasi fasies didapatkan berupa Sedimentary Gravity Flow (SG), Gravel Bars (GB), Sandy Bedforms  (SB), channel (CH), Overbank fine  (FF). The interpretation of the depositional environment shows a fluvial environment, the type of braided river with a gravel braided rivers model with sedimentary gravity flows.","PeriodicalId":363304,"journal":{"name":"Journal of Earth and Marine Technology (JEMT)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120968451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The mined volume calculation in the traditional mining area by using the Unmanned Aerial Vehicle (UAV) approach in the observation area of CV. Sinergi Karya Solutif, Patikraja district, Banyumas regency, East Java province, Indonesia","authors":"Sigit Allobunga, R. K. Putri, Muhammad Abdurrozak Siamashari, Ika Justitia Julita, A. Fathoni, Heru Dwiriawan","doi":"10.31284/j.jemt.2022.v2i2.2869","DOIUrl":"https://doi.org/10.31284/j.jemt.2022.v2i2.2869","url":null,"abstract":"The studies become performed in Notog Village, Patigkraja District, Banyumas Regency, Central Java Province withinside the statement place of CV. Sinergi Karya Solutif with the purpose of comparing the extent of minerals and describing the way to calculate the extent mined with a greater green approach. In measuring and calculating the volumetric minerals, its miles are executed via way of means of the use of the UAV (Unmanned Aerial Vehicle) approach or drones which include drones to get aerial photos. The gathered records may be the number one records utilized in carrying out volumetric analysis. They have a look at becoming performed for 2 (two) months. The consequences acquired withinside the shape of aerial image records as number one records and a base map inclusive of geography, topography, and geology as assisting records. Mined extent acquired via way of means of processing records the use of assisting software program is 11.568.136 m3 at the same time as in records processing the use of different techniques on this guide is 123,365 m3. From the 2 calculation techniques, its miles recognized that the distinction withinside the mined extent is 768.363 m3.","PeriodicalId":363304,"journal":{"name":"Journal of Earth and Marine Technology (JEMT)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127865422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geotechnical Stability Analysis of the Quay Wall of Military Port Ksar Sghir, Morocco","authors":"Mohamed Ait Boujmaa, Houssam Khelalfa","doi":"10.31284/j.jemt.2022.v2i2.2374","DOIUrl":"https://doi.org/10.31284/j.jemt.2022.v2i2.2374","url":null,"abstract":"This article consists in establishing a geotechnical stability study of the -4m/zh quay belonging to the Ksar Sghir Port. First of all, using the TALREN software for verification against large slips. the study presents a verification of the stability for the rear slope slip circles and for the front slope slip circles in the static case. Secondly, stability was determined for the back slope slip circles and for the front slope slip circles in the seismic case.  Moreover, PLAXIS software was used to model the displacements and constraints in the structure. Following the results of the safety coefficients, we notice that the stability of the structure gives acceptable values. In addition, the soil does not reach breaking stress. The total mean stress and total displacement mostly impacted the surface area that is related to external impact.","PeriodicalId":363304,"journal":{"name":"Journal of Earth and Marine Technology (JEMT)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121716465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The influence of tectonics on underwater morphology of the Arafura Sea by using seismic refraction in West Papua, Indonesia","authors":"Jusfarida Jusfarida, P. H. Wijaya, Idriem Syafri, Budhi Hardjana","doi":"10.31284/j.jemt.2022.v2i2.2902","DOIUrl":"https://doi.org/10.31284/j.jemt.2022.v2i2.2902","url":null,"abstract":"The Arafura waters are part of the northern edge of the Mesozoic Passive Margin of Australia. The movement of plates on the ocean floor results in the formation of reliefs on the seabed, these reliefs are commonly referred to as seabed morphology. Tectonic activity on the Tarera-Aiduna fault, until now still plays an important role and controls conversion tectonic activity in this area. Collision between plates or subduction is the eventuality quality of a collision between plates, where one plate plunges downwards, forming an ocean trench. The seabed is a very deep and narrow seabed, the walls are steep and steep with a depth of more than 200 m. The purpose of this study was to determine the morphological formations on the seabed caused by tectonic activity, so as to obtain what tectonic processes are working in the area. The method used in this research is to analyze the data generated by the survey ship Geomarine III, owned by P3GL, Ministry of Energy and Mineral Resources. The data used are Marine seismic data and Bathymetry data, analysis of seismic data is intended to determine rock layers, and the geometric shape of the structures that develop in the area, while Bathymetric data analysis is intended to determine the depth of sea water, which is also used to determine reliefs. Or morphology under the seabed. The results of the analysis are in the form of morphological formations on the ocean floor starting from the Exposure area to the Aru Trench.","PeriodicalId":363304,"journal":{"name":"Journal of Earth and Marine Technology (JEMT)","volume":"891 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116176399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geothermal Temperature Slope at the KDD – 1 Well, Kadidia and Surrounding Areas, Nokilalaki, Sigi, Central Sulawesi Province","authors":"Irwan Firmansyah, S. Siswandi, S. Iswahyudi, Dudi Hermawan, Santia Ardi Mustofa","doi":"10.31284/j.jemt.2022.v2i2.2873","DOIUrl":"https://doi.org/10.31284/j.jemt.2022.v2i2.2873","url":null,"abstract":"The need for alternative energy other than fossil energy is felt to be increasingly urgent for the fulfillment of domestic electrical energy. In meeting the demand for electricity, the government needs to investigate alternative geothermal energy, to find out the potential for geothermal energy to provide electricity. The realization of this policy is that the government conducts an integrated geothermal investigation to find prospective geothermal areas that can be developed as electric power. Nokilalaki District, Sigi Regency, Central Sulawesi Province is one area that has geothermal potential in Indonesia. The Kadidia geothermal area, Sigi Regency, Central Sulawesi Province is one of the volcanic geothermal fields that have good potential and needs to be investigated further, especially on geological conditions that affect the presence of geothermal energy. The research method used is the method of analyzing the results of field observations. From the observations, it was concluded that the KDD-1 temperature gradient well had a final depth of 703.85 m. The formation temperature is 96.87 ºC at a depth of 700-meters with an average slope value of 12.8 ºC/100 meters, and the estimated temperature at a depth of 1500 m (estimated top reservoir) is 220 ºC.","PeriodicalId":363304,"journal":{"name":"Journal of Earth and Marine Technology (JEMT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125820595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The detailed morphological formation based on geological investigation in Somawangi and surrounding areas, Mandiraja District, Banjarnegara Regency, Central Java","authors":"Mudrik Infithor Nurul Qur'an, S. Siswandi, Akhmad Khalil Gibran","doi":"10.31284/j.jemt.2022.v2i2.2880","DOIUrl":"https://doi.org/10.31284/j.jemt.2022.v2i2.2880","url":null,"abstract":"Geological mapping is an activity to be able to know the geological conditions of a field. Somawangi Village and its surroundings have a geological history depicting the history of the past that continues until now. This location is located in Mandiraja District, Banjarnegara Regency with a morphology consisting of rock outcrops that record past history which can be used as learning media for the field of geological science. This study aims to determine the geological conditions and resource potential as well as geological disasters at the research site. From the results of the study, it can be concluded that the Geomorphology of the research area can be divided into 3 geomorphological units, namely the Sloping Structural Hills Unit (S3), Structural Sloping Lowland Unit (S1), and Volcano Denudational Hills Unit (V14) with the composition The stratigraphy of the study area is divided into 5 rock units, from the oldest to the youngest, the Somawangi Volcanic Breccia Unit, the Sandstone Unit, the Andesite Lava Unit, the Tuff Rock Unit, and the Kaliwungu Volcanic Breccia Unit. The geological structure of the research area is the Left Fault which is found along the rivers and hills in the eastern area of the research location with an emphasis on northeast-southwest. And the geological potential of the research area can be divided into 2, namely positive potential such as mining of sand and rocks around the river, the use of red soil as a ceramic and brick material, the use of andesite lava which has the potential to mine minerals, and the presence of mineralization alteration in the research area. While the negative potential is the potential for land movement or landslides","PeriodicalId":363304,"journal":{"name":"Journal of Earth and Marine Technology (JEMT)","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126403487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}