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All Journal Journal of Geoscience, Engineering, Environment, and Technology Journal of Geosciences and Applied Geology
Sendjadja, Yoga Andriana
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Earth & Planetary Sciences Engineering Environmental Science Physics

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Evidence of Pliocene-Pleistocene Unconformity in eastern Bogor Trough, Sumedang-West Java Alam, Syaiful; Sendjadja, Yoga Andriana; Jurnaliah, Lia; Fachrudin, Kurnia Arfiansyah; Gani, Reza Mohammad Ganjar
Journal of Geological Sciences and Applied Geology Vol 3, No 1 (2019): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v3i1.21528

Abstract

AbstractRecent measuring stratigraphic observation in Cikandung River has revealed the Late Pliocene stratigraphic and tectonic event. Research area is located in easter Bogor Trough. Previously, it was stated controversially pertaining to the stratigraphic relationship between Kaliwangu and Citalang Formations. The outcrop-based remark has never been explained, slightly intuitive. Making strike and dip measurements and stratigraphic analysis using tape and compass traverse were done to unveil the role of Plio-Pleistocene tectonic regime in stratigraphic-filling of the basin. Strike azimuths recorded from several locations of Citalang and Kaliwangu Formations show angular geometry and both of those sedimentary facies within formations indicate the significant and rapid change in depositional process. But interestingly, the angular geometry is only founded in the southern part of study area. To the north, angular relationship becomes parallel. This geometrical distribution implies the strong influence of tectonic regime in Late Pliocene interval. The evidence from outcrops observation conclude the unconformity between Citalang and Kaliwangu Formations. Keywords: Stratigraphic unconformity, Citalang and Kaliwangu Formations, Plio Pleistocene Tectonic
SOURCE ROCK CHARACTERISTICS BASED ON GEOCHEMICAL ANALYSIS AND 1D BURIAL HISTORY MODELING IN THE “NAY” FIELD SOUTH SUMATRA BASIN Yoza, Nizalia Azzahra; Butarbutar, Elrey Fernando; Sendjadja, Yoga Andriana; Ilmi, Nisa Nurul
Journal of Geological Sciences and Applied Geology Vol 7, No 1 (2023): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v7i1.49033

Abstract

The research is located in the "NAY" Field, South Sumatra Basin at NAY 1-4 Wells. This research was carried out with the aim of knowing the characteristics of source rock such as quantity, quality, maturity, and depositional environment using geochemical analysis, then analyzing the burial history in the study area which was visualized in 1D modeling using Petromod. The results showed that the dominant Well has effective source rock in the Talang Akar Formation. The results of the 1-D Burial History modeling show that the NAY-1 Well is entering phase early mature at a depth of 2394 m at the Talang Akar formation in Early Pliocene (4.22 Ma) and starting to enter the mature phase at a depth of 2521 m in Middle Pliocene (3.27 Ma). The NAY-2 well is entering phase of early mature at a depth of 2521 m at the Talang Akar formation in Early Pliocene (2.64 Ma) and this formation is entering the mature phase at a depth of 2600 m which is Late Pliocene (1.32 Ma). The NAY-3 Well is still immature. Then the NAY-4 well entering phase of early mature at a depth of 2255 m at the Talang Akar Formation in Early Pliocene (2.27 Ma) and the Baturaja Formation at a depth of 2166 m in Late Pliocene (1.63 Ma). The results also show that the majority of the hydrocarbons found in this basin have a marine-terrestrial depositional environment.
DETERMINATION OF HYDROCARBON ZONE AND DEPOSITIONAL ENVIRONMENT FACIES IN TALANG AKAR FORMATION, SOUTH SUMATRA BASIN AT "EPURA" FIELD KAMILA, PUTRI; Sunardi, Edy; Sendjadja, Yoga Andriana; Pranopto, Andri; Herida, Shaskia
Journal of Geological Sciences and Applied Geology Vol 7, No 2 (2023): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v7i2.50361

Abstract

The EPURA field is one of the oil and gas producing fields in the South Sumatra Basin, where well completion has been carried out in the Talang Akar Formation, and the production test results are interpreted to mean that in wells EP-13, EP-14, EP-15, EP-16, EP-17 and EP-23 contain several reservoir zones that have the potential to contain hydrocarbons. This research with facies interpretation analysis uses data from six wells (wireline, mudlog, RCAL and lithology data), so it is hoped that it can provide more detailed information for the development of an oil and gas field. The analysis carried out is in the form of facies analysis, depositional environment, electrofacies and facies correlation. From the research results, it was found that the Talang Akar Formation has depositional facies in the form of a fluvial, which in this study is the Lower Talang Akar Formation with depositional facies in the form of channel, Crevasse Splay, point bar and flood plain. Based on the analysis results, the Talang Akar Formation is divided into 3 reservoir zones, namely Zone EP-1, EP-2, and EP-3. After going through all stages of petrophysical analysis, it was found that zones with high hydrocarbon potential were found in wells EP-13, EP-23 and EP-16. The wells with low hydrocarbon potential are EP-14, EP-15 and EP-17 wells. The zone of highest hydrocarbon potential in prospect wells is in the EP-1 zone with a Crevasse Splay facies association and has thick sandstone lithology characteristics with medium to fine grain size.
Web-based Application for Granite Tectonic Discrimination Visualization Febian, Herru Sendia; Sendjadja, Yoga Andriana; Hutabarat, Johanes; Sari, Dara Kurnia
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 3 (2026): JGEET Vol 11 No 03 : September (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.3.21093

Abstract

One of categorization method for granitic rock is by their tectonic setting which can be analyzed by plotting their trace element value in discrimination diagram. Discrimination diagrams proposed by Pearce et al., particularly Rb vs (Y+Nb) and Rb vs (Yb+Ta) diagram, have been widely used by igneous geochemists. To produce the trace element plots in discrimination diagrams, many researchers use desktop software such as GCDKit, PetroGraph, GeopyTool, etc., which generate static diagrams. The deficiencies in using static diagrams are that the user cannot comparatively analyze the plotting result with another available data from different location or rock type and user also cannot group some identical data to allow more flexible analysis. Moreover, there are some more disadvantages when using desktop software which can only be accessed from one computer device and user cannot store and use data collectively. Web-based applications built using Node.js, MySQL and D3.js can be used to produce visualization for Pearce diagram interactively, store big data of trace elements into the database and access by many users.  Using D3.js library, web bases application can generate diagrams with plots and/or density plots which allow more comprehensive comparative analysis between some corresponded geochemical data.
Co-Authors Butarbutar, Elrey Fernando Edy Sunardi Fachrudin, Kurnia Arfiansyah Febian, Herru Sendia Herida, Shaskia Johanes Hutabarat KAMILA, PUTRI Lia Jurnaliah Nisa Nurul Ilmi Pranopto, Andri Reza Mohammad Ganjar Gani Sari, Dara Kurnia Syaiful Alam Yoza, Nizalia Azzahra