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INDONESIA
Indonesian Journal on Geoscience
Published by Institut Teknologi Nasional Yogyakarta
ISSN : 23559314     EISSN : 23559306     DOI : http://ijog.bgl.esdm.go.id/index.php/IJOG/article/
Core Subject : Science, Engineering,
Earth & Planetary Sciences Engineering
The spirit to improve the journal to be more credible is increasing, and in 2012 it invited earth scientists in East and Southeast Asia as well as some western countries to join the journal for the editor positions in the Indonesia Journal of Geology. This is also to realize our present goal to internationalize the journal, The Indonesian Journal on Geoscience, which is open for papers of geology, geophysics, geochemistry, geodetics, geography, and soil science. This new born journal is expected to be published three times a year. As an international publication, of course it must all be written in an international language, in this case English. This adds difficulties to the effort to obtain good papers in English to publish although the credit points that an author will get are much higher. This Journal publishes 3 numbers per year at least 15 articles. It is a challenge for the management of the journal to remain survive and at the same time continuously maintain its quality and credibility in spite of those various constraints. Fortunately, this effort is strongly supported by the Geological Agency of Indonesia, as the publisher and which financially bear the journal. Last but not least the journal is also managed by senior geologist of various subdisciplines from various countries who are responsible for its quality.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi
Articles 324 Documents
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Evaluation of Hydrocarbon Source Rock Potential and Organic Geochemistry in North Arafura Shelf, Papua (Indonesia) Sabra, Eriko
Indonesian Journal on Geoscience Vol 8, No 3 (2021)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1281.137 KB) | DOI: 10.17014/ijog.8.3.401-416

Abstract

The results of this study identified two potential source rock intervals of Permian age in the North Arafura Shelf area of Papua, Indonesia. The first potential source rock interval (SR-1) was identified at 3834.9 m to 3838.6 m depth within the Kola-1 well, which is believed to be good to very good potential source rock with TOC in the range of 2.94 to 3.4 wt %, S1 0.78 to 0.97 mg HC/g, and S2 5.63 to 9.5 mg HC/g. The source rock is composed of type II and III kerogens with HI in the range of 164 to 275 mg HC/gTOC and reached the maturation stage with Ro of 0.83 - 0.86%, Tmax of 442 - 444 C, and Production Index (PI) of 0.09 - 0.12. The second potential source rock interval (SR-2) is at 3060.1 - 3136.3 m depth in the ASM-1X well and has fair potential to be source rock with TOC of 0.95 wt %, S1 of 1.01 mg HC/g, and S2 of 3.39 mg HC/g. This source rock has type II kerogen with a HI value of 357 mg HC/g TOC and has reached maturation as indicated by a Ro value of 0.63%, Tmax of 430 C, and PI of 0.23. Biomarker analysis revealed SR-1 is type III kerogen with terrigenous input and was deposited in an estuarine environment.
Characterization of Reservoir Rocks of X Gas Field, Surma Basin, Bangladesh Parvin, Afroza; Rahman, Md Jamilur; Samad, Abdus; Woobaidullah, A.S.M.
Indonesian Journal on Geoscience Vol 8, No 3 (2021)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.8.3.417-426

Abstract

This paper deals with the rock physical analysis of primary reservoir rocks in the X gas field, which includes identifying the transition zone between mechanical and chemical compaction zones and the amount of cement in the reservoir rock. The analysis is performed by plotting different log data (Gamma-ray, density, neutron porosity, and sonic log) against depth, constructing the cross plot, and plotting of sonic and porosity logs with cement model. The transition zone, which is the boundary between mechanical and chemical compactions, indicates a sharp increase in density and a decrease in porosity with no lithological change at 2,576 m depth (Well-2). Among three gas sands, the upper gas sand and upper part of the middle gas sand are located within the mechanical compaction zone. The lower parts of the middle gas sand and lower gas sand are within the chemical compaction zone. Cement model analysis showed that the upper gas sand and upper part of the middle gas are composed of unconsolidated sand. In contrast, the lower part of middle gas sand and lower gas sand comprise of consolidated sand, having almost 2% contact cement.
Documentation, Analysis and Reconstruction of the Paleo-landuse of Wadi Musa with Special Reference to the Nabataean Period: A Geomatic Study based on Archaeological Evidence Al Farajat, Mohammmad; Twaissi, Saad; Al Hasanat, Mahmoud B; Al-Rawabdeh, Abdulla; Al Falahat, Hani; Hijazeen, Emad; Al Eide, Ekhlas
Indonesian Journal on Geoscience Vol 8, No 3 (2021)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.8.3.427-441

Abstract

Archaeologists and historians throughout time have relied mainly on textual, architectural, and art-historical analyses to understand the historical context of civilizations. This traditional approach has been challenged, however, by the current new practices in archaeological studies, which tend to rely on more scientific methods (e.g. information systems) to understand the wider context of the socio-cultural aspects of past societies. For example, the Nabataean studies, which for more than seventeen decades after the rediscovery of Petra in 1812, are based on the art historical analysis of the rock-cut facades of the the city of Petra. The wider story of the socio-cultural, political, and economic aspects of the Nabataean culture is still not well understood. Just recently archaeological research was undertaken to improve the understanding of the Nabaatean phenomenon from outside Petra. This paper discusses this new attempt to investigate the spatial organization and land use of Wadi Musa during the Nabataean period based on GIS analysis and new archaeological discoveries. Utilizing GIS in discovering historical phenomena provides a new perspective for analysis, whereby structures are treated not as individual archaeological items but rather as a system. This paper also presents a case study that demonstrates the significance of using GIS for historical research by shedding light on the temporal variation of Wadi Musa settlements with special focus on the paleo-landuse of the Nabatean period. The resulting reconstructed map indicates that Wadi Musa was well planned with special zones for elite residents, industry, rural communities, and agriculture. Social segregation/stratification is also well indicated in the plan of the city. The reconstructed map indicates that the strategy for Nabataean land use for Wadi Musa was to use it as a green zone around the city of Gaia.
Contributions of Loading and Unloading to Overpressure: Analytical Results from The Shelfal Area of The Lower Kutai Basin, Indonesia Ramdhan, Agus M.; Hutasoit, Lambok M.
Indonesian Journal on Geoscience Vol 9, No 1 (2022): in-press
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.9.1.1-13

Abstract

A modified Bowers Method is applied to analyze the contribution of loading and unloading to total overpressure magnitude in the shelfal area of the Lower Kutai Basin. The method combines Bowers Method with density-sonic cross plots to differentiate contributors to overpressure. This method has a strong physical background, and has proven to give satisfactory overpressure estimation in the studied area. Several processes related to overpressure and compaction in the studied area have also been deduced: 1) top of overpressure is caused by unloading due to gas generation, 2) gas generation on its own can produce overburden-scale overpressure magnitude, 3) loading starts to contribute to overpressure at depth, where the lithology is dominated by mudrocks, 4) effective stress history experienced by mudrocks before unloading, and 5) the presence of two compaction lines and therefore two associated velocity-effective stress relations.

Page 33 of 33 | Total Record : 324

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