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Geosains Kutai Basin
Published by Universitas Mulawarman
ISSN : -     EISSN : 26155176     DOI : https://doi.org/10.30872/geofisunmul.v5i2
Core Subject : Science,
Earth & Planetary Sciences
Coastal and Ocean Dynamics Environmental of Geophysics Geodesy and Geography Geographic Information System Geology Geophysics Exploration Geotechnical/ geo-engineering Hazard Mitigation Hydrology Meteorology and Climatology Mining Engineering Seismology and Volcanology Oceanography
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geofisika
Articles 5 Documents
 1 
Search results for , issue "vol. 9 no. 2 (2026)" : 5 Documents clear
Identifikasi Penentuan Lapisan Akuifer Berdasarkan Data Well Logging di Bandar Udara Internasional Aji Muhammad Sulaiman, Kota Balikpapan Insyirah Salsatri Rusdinur; Supriyanto; Djayus; Wahidah; Sahara Hamas Intifadhah
GEOSAINS KUTAI BASIN Vol. 9 No. 2 (2026)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/wma32s81

Abstract

Ketersediaan air bersih merupakan kebutuhan vital bagi kegiatan operasional Bandar Udara Internasional Aji Muhammad Sulaiman Balikpapan. Penelitian ini bertujuan untuk mengidentifikasi lapisan akuifer serta menentukan zona potensial air tanah menggunakan data well logging. Data yang digunakan terdiri atas dua sumur bor yang dilengkapi tiga jenis log, yaitu log Gamma Ray (GR), log Resistivitas (Rt), dan log Self Potential (SP). Log GR digunakan untuk menginterpretasi litologi, log Rt untuk mengetahui sifat kelistrikan batuan yang berkaitan dengan kandungan fluida, sedangkan log SP dimanfaatkan untuk menilai tingkat permeabilitas lapisan. Hasil analisis menunjukkan bahwa pada Sumur 1 teridentifikasi 14 interval akuifer, dengan dua zona potensial utama pada kedalaman 33–43 m dan 60–74 m yang keduanya termasuk akuifer tertekan. Pada Sumur 2 ditemukan 8 interval akuifer, dengan zona potensial utama pada kedalaman 17–22 m dan 68–82 m, yang juga dikategorikan sebagai akuifer tertekan. Hasil penelitian ini diharapkan dapat menjadi acuan dalam penentuan lokasi pemanfaatan air tanah serta mendukung upaya pengelolaan sumber daya air yang lebih efektif dan berkelanjutan, khususnya untuk memenuhi kebutuhan masyarakat dan operasional di wilayah penelitian.
Pemodelan dan Estimasi Potensi Batubara menggunakan Inverse Distance Weighting (IDW) berdasarkan Data Geologi Permukaan dan Pemboran di Daerah Batang Gangsal, Riau Rizki Satria Rachman; Sigit Arso Wibisono
GEOSAINS KUTAI BASIN Vol. 9 No. 2 (2026)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/kge58654

Abstract

Batubara tetap menjadi sumber energi primer penting, meskipun pergeseran kebijakan energi nasional menuju energi baru terbarukan telah menurunkan pemanfaatannya. Data potensi batubara di Provinsi Riau, termasuk daerah Batang Gansal, masih terbatas dan jarang diperbarui melalui pemodelan tiga dimensi, sehingga kajian ini relevan untuk melengkapi basis data sumber daya batubara nasional yang cenderung stagnan. Penelitian ini memodelkan dan mengestimasi potensi batubara di daerah Batang Gansal, Kabupaten Indragiri Hulu, Provinsi Riau, menggunakan metode Inverse Distance Weighting (IDW), berdasarkan pemetaan geologi permukaan, pengeboran eksplorasi, analisis laboratorium, dan pemodelan tiga dimensi. Batubara dijumpai pada Formasi Lakat (Bekasap) berumur Oligosen–Miosen Awal, dengan ketebalan lapisan 0,14–2,07 m pada tujuh seam (A–G), di mana Seam A memiliki sebaran dan ketebalan terbesar. Pemodelan IDW (power = 2, radius = 3.000 m, isotropik) menghasilkan block model dan solid model sebagai dasar estimasi volume dan tonase batubara. Berdasarkan SNI 5015:2019, total potensi batubara mencapai 35,14 juta ton (20,35 juta tereka, 8,67 juta tertunjuk, 6,12 juta terukur), dengan nilai kalori 1.668–7.289 kal/g adb. Hasil ini menegaskan potensi batubara Batang Gansal yang signifikan serta menunjukkan bahwa integrasi data permukaan dan bawah permukaan melalui pemodelan IDW merupakan pendekatan efektif untuk evaluasi sumber daya batubara, sekaligus menjadi acuan awal bagi industri dan pemerintah daerah dalam menentukan prioritas eksplorasi dan pengelolaan sumber daya di Riau.
Numerical Modeling of Salinity Intrusion in Balikpapan Bay: Assessing the Impact of Upstream River Discharge Scenarios Iwan Pramesti Anwar; Mutiara Rachmat Putri; Ayi Tarya; Idris Mandang; Agus Setiawan
GEOSAINS KUTAI BASIN Vol. 9 No. 2 (2026)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/1ntqk236

Abstract

Balikpapan Bay, situated in the rapidly evolving Nusantara Capital Region, is significantly susceptible to alterations in freshwater influx resulting from dam construction and the reduction of river discharge. This study utilizes the three-dimensional baroclinic Hamburg Shelf Ocean Model (HAMSOM) to simulate hydrodynamics, temperature, and salinity across various river discharge scenarios. Model validation shows that the model is good enough at capturing the bay's physical processes. The RMSE values are 0.1 m for sea level, 0.1 m/s for current speed, 0.67 psu for salinity, and 1.41°C for temperature. The correlation coefficients are between 0.85 and 0.99. Then, the 50% decrease in discharge raises salinity levels throughout the estuaries. Then a 95% decrease of river discharge leads to long-lasting saline intrusion levels of 34–36 psu. This effect was observed even in areas that are typically dominated by freshwater. The spatial analysis shows that when there is less flow, the system changes to a state where tides are more dominated and marine intrusion is more common. As a result, the influence of freshwater diminishes. These results show how important it is to keep the river discharge at the right level to keep the estuarine balance. They also show how important it is to manage water resources in a way that considers rapid regional growth for environmental sustainability.
Carbonate Rock Petrography as an Indicator of Climate Change and Sea Level Fluctuations: A Literature Review Isman Saleh
GEOSAINS KUTAI BASIN Vol. 9 No. 2 (2026)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/gpcf6544

Abstract

Carbonate rock petrography is an important approach for reconstructing climate change and sea-level fluctuations throughout geological time. This study aims to review carbonatepetrographic characteristics that can be used as indicators of climate change and sea-level fluctuations, the methodological approaches applied in paleoenvironmental interpretation, andthe limitations of their application. A systematic literature review was conducted on scientific publications addressing carbonate petrography, climate change, paleoclimate, sea level, microfacies, diagenesis, isotope geochemistry, and sequence stratigraphy. The review shows that petrographic indicators of climate change include mineralogical composition, clay mineral assemblages, fossil content and biotic assemblages, textural characteristics, and diagenetic features. Sea-level fluctuations can be reconstructed through changes in microfacies and depositional depth, transgressive-regressive patterns, carbonate platform architecture, and variations in carbon and oxygen isotopes. The most reliable interpretations are obtained by integrating petrographic analysis with geochemical data, including stable isotopes, trace elements, XRD, XRF, and other advanced analytical techniques. However, several challenges remain, particularly diagenetic overprinting, seasonal and environmental biases, and the difficulty of distinguishing climatic signals from tectonic influences. Therefore, the integration of multi-proxy approaches and rigorous assessment of preservation conditions is essential for improving the reliability of carbonate rocks as geological archives of climate and sea-levelchange. 
Simulation of Storm Surge Generated by Tropical Cyclone Senyar in the Strait of Malacca Using the ADCIRC Model Amanu, Rendy Syahril; Sabrina, Purwanti Lelly; Avrionesti; Amri, Sayful
GEOSAINS KUTAI BASIN Vol. 9 No. 2 (2026)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/561wve82

Abstract

Tropical Cyclone (TC) Senyar, which formed over the Strait of Malacca in late November 2025, represents a relatively rare meteorological phenomenon in the near-equatorial region. Its strong wind field and low central pressure had the potential to generate a rise in sea level (storm surge) along the northern coast of Sumatra. This study aims to quantify the storm surge contribution associated with TC Senyar using the Advanced Circulation (ADCIRC) hydrodynamic model over a domain spanning 95–105°E and 0–8°N. Simulations were conducted from 22 November to 2 December 2025, incorporating a two-day ramp-up period to gradually increase the meteorological forcing. Two scenarios were simulated: the total sea level, influenced by tides, wind, and atmospheric pressure; and the tidal sea level, influenced solely by tidal boundary conditions. The unstructured computational mesh was generated using OceanMesh2D at a resolution of 2.5–50km, based on GEBCO 2025 bathymetry and GSHHS coastline data. Meteorological forcing (wind and atmospheric pressure) was obtained from ERA5, while tidal boundary conditions were derived from TPXO10. Storm surge was computed using the residual method, in which the tidal sea level was subtracted from the total sea level, and was analyzed at four stations: Lhokseumawe, Idi Rayeuk, Belawan, and Kuala Tanjung. The results show maximum residual storm surge values of 0.06 m, 0.12 m, 0.18 m, and 0.17m, respectively, with peaks occurring between 25 and 27 November 2025. The largest storm surge amplification, exceeding 0.25m, occurred along the coast of the Malay Peninsula and the southern part of the Strait of Malacca.

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