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All Journal Jurnal Geofisika Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal)
Nugraheni, Adelia Saras
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Agriculture, Biological Sciences & Forestry Chemistry Earth & Planetary Sciences Education Energy Physics

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Modeling Of Liquefaction Potential Zone Using The Global Geospatial Model (Case Study: Special Region of Yogyakarta and Klaten Regency) Nugraheni, Adelia Saras
Jurnal Geofisika Vol 21 No 1 (2023): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v21i1.529

Abstract

Liquefaction is a subsequent disaster that occurred due to an earthquake. Liquefaction that occurred in the Special Region of Yogyakarta and Klaten district after the 2006 earthquake in the form of sand and clay material bursts, changes in groundwater levels and groundwater quality in community wells. The purpose of this study was to determine the potential zones of liquefaction based on global geospatial methods in the Special Region of Yogyakarta and Klaten districts. The global geospatial method models the potential for liquefaction based on the parameters Vs30, PGA, and CTI. The model was validated with groundwater depth and subsurface lithology data based on microtremor data. The validation process produces a zone of potential liquefaction in the Special Region of Yogyakarta and Klaten district. The results showed a zone with a high potential for liquefaction occurring in the southern coastal areas of Kulon Progo and Bantul. The zone is in the alluvium formation, Vs30 180 to 270 m / s, CTI 7 to 11.5, PGA 660 to 840 gal, groundwater depth 0.26 to 4.49 masl, and dominated by sand material. Zones with high potential for the occurrence of faction are also found in the fault areas of Opak Sleman and Bantul. The zone is in the formation of the younger Merapi volcano, Vs30 180 to 3.15 m/s, CTI 7 to 13.5, PGA 960 to 1140 gal, groundwater depth 0.89 to 4.7 masl, and dominated by material earth, ash, and tuff.
Identification of the Capabilities of the Kerek Sandstone Unit as a Hydrocarbon Reservoir in the Karangkepoh Area and Surrounding Areas, Boyolali, Central Java Hardiyanto, Dwi Wahyu; Nugraheni, Adelia Saras
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 1 (2026): Februari
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i1.1714

Abstract

Karanggede is part of the Kendeng Zone physiography, which was formed by compressional tectonics since the Middle Oligocene. This zone consists of deep marine to transitional sedimentary deposits with hydrocarbon reservoir potential. The Kerek Formation in the study area is dominated by layered carbonate sandstone and carbonate mudstone. The study site is located in Karangkepoh Village, Karanggede District, Boyolali Regency, Central Java. Geologically, this unit has undergone structural deformation that affects the physical properties of the reservoir rock. This study aims to evaluate the quantity and quality characteristics of the Kerek Formation carbonate sandstone as a hydrocarbon reservoir. The research methods include field observations and laboratory analysis of porosity and permeability parameters. The test results show very low porosity values, ranging from 1.53% to 1.78%. These porosity values indicate the rock's limited ability to store fluids. In contrast, the permeability values range from 98.53 mD to 906.74 mD. These permeability values are classified as good to very good. This condition indicates the presence of fluid flow paths that develop despite limited effective pore space. The relatively high permeability is controlled by grain size and inter-pore connectivity. The rock texture relationship plays a significant role in determining reservoir characteristics. Overall, the carbonate sandstone of the Kerek Formation in the study area acts primarily as a fluid-flow medium rather than a storage medium.
Co-Authors Hardiyanto, Dwi Wahyu