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Rahmiati
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Jalan Barong Tongkok No.4 Gunung Kelua Samarinda, East Kalimantan Province Indonesia - 75123
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Kalimantan timur
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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 8 Documents
 1 
Search results for , issue "Vol 2 No 1 (2019)" : 8 Documents clear
ANALISIS NILAI LOG GAMMA RAY DAN LOG DENSITY TERHADAPVARIASI KECEPATAN PEREKAMAN METODE WELL LOGGING “ROBERTSON GEOLOGGING (RG)” Khasanah, Ulfiatul; Supriyanto, Supriyanto; Djayus, Djayus
GEOSAINS KUTAI BASIN Vol 2 No 1 (2019)
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/geofisunmul.v2i1.400

Abstract

The lithology of rocks in the subsurface can be known from the results of analysis of coring and geophysical logging. The activity of recording data geophysical logging in the work area of PT. Mintec Abadi generally uses a velocity of 3 m/minute - 4 m/minute with drill depths and different location points. The purpose of this study was to determenite the lithology pattern of rocks based on curves gamma ray log and density with record velocity variation of geophysical logging, and what is the optimal velocity. Records of data geophysical logging (Log Gamma Ray and Density Log) on well log tests with velocity variation, in the same lithology range of rocks, analyzed by the structure and pattern of the lithology, and compared to other velocity. The results of this study shows the lithological pattern of the record velocity variation (1.5 m/minute – 10 m/minute) give relatively the same results with the lithology arrangement is top soil, mudstone, coal and muddy sandstone. The optimal velocity of geophysical logging based on conditions in the work area of PT. Mintec Abadi between 5 m/minute – 7 m/minute.
STUDI TRANSPOR SEDIMEN DI PERAIRAN PANTAI KALIMANTAN TIMUR DENGAN MENGGUNAKAN MODEL HIDRODINAMIKA Prasetiyo, An’am; Yusuf, Mustaid; Mislan, Mislan
GEOSAINS KUTAI BASIN Vol 2 No 1 (2019)
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/geofisunmul.v2i1.348

Abstract

The study was conducted in Balikpapan Bay, Adang Bay, and Apar Bay to simulate sediment transport induced by tidal current. The sediment transport information is very important for environmental management as well as environmental impact analysis. This study has applied COHERENS (Coupled Hydrodynamical Ecological model for Regional and Shelf Seas). Barotropic mode of COHERENS has performed the simulation from 15 December 2012 to 14 January 2013, using 8 tidal component delivered from NAO99b as generation force. The model simulation result are verified using tides of observation data from 15 December to 31 December 2012 the Semayang Port. Verification result shows a good agreement between simulation data and observation. The RMSE is about 0.158 meter. In Balikpapan Bay the result shows higher concentration points is are located at Port area and Riko River Estuary, with sediment transport around 1.1577 x10-4 (kg/m2)/s, on Adang Bay the concentration point is located at inner part of Bay, with transport sediment around 1.6499 x10-4 (kg/m2)/s, and at Apar Bay concentration point is located at outer part of Bay, with sediment transport value around x10-15 (kg/m2)/s.
ANALISIS PENYEBARAN SIFAT FISIS BATUAN RESERVOIR DENGAN METODE GEOSTATISTIK (STUDI KASUS: LAPANGAN BOONSVILLE, TEXAS, AMERIKA SERIKAT) Puspita Sari, Claudia Dewi; Lepong, Piter; Natalisanto, Adrianus Inu
GEOSAINS KUTAI BASIN Vol 2 No 1 (2019)
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/geofisunmul.v2i1.349

Abstract

Physical properties of reservoir rocks are very important in hydrocarbon production. This study analyzes the physical properties of porosity value in reservoir rocks. The aim was to estimate the distribution of porosity in the reservoir rocks. There are several methods available in estimating the reservoir properties distribution. This study uses the geostatistical method to estimate the distribution of porosity value in three different wells in Boonsville Field. Semivariogram analysis is essential steps in geostatistical method in analysis the autocorrelation the the petrophysical data of geophysical logging. The experimental semivariogram with spherical model obtained the sill value 14,94; nugget value 7,85; and range value 1646. The value use as input data in estimate the distribution of porosity value by ordinary kriging. Result of estimation using geostatistical method shown in around well area of IG Yates 31 and IG Yates 19 have the most optimal physical properties as reservoir rocks.
ESTIMASI SEBARAN KUALITAS BATUBARA (ASH CONTENT) MENGGUNAKAN METODE INVERS DISTANCE WEIGHTED (IDW) DAN ORDINARY KRIGING (OK) DI PT. KAYAN PUTRA UTAMA COAL SITE SEPARI, KALIMANTAN TIMUR Wahyuni, Sri; Supriyanto, Supriyanto; Djayus, Djayus
GEOSAINS KUTAI BASIN Vol 2 No 1 (2019)
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/geofisunmul.v2i1.330

Abstract

Nilai kadar abu batubara dapat diketahui dari hasil pengujian laboratorium dan atau dilakukan melalui estimasi menggunakan teknik interpolasi Invers Distance Weighted dan Ordinary Kriging. Penelitian ini dilakukan dengan membuat simulasi berdasarkan model blok distribusi kadar abu dan nilai ketebalan yang dihasilkan dari interpolasi Invers Distance Weighted dan Ordinary Kriging. Keakuratan hasil dari proses estimasi kedua metode dievaluasi berdasarkan Root Mean Square Error (RMSE). Metode Ordinary Kriging RMSE lebih kecil dari pada RMSE Metode Invers Distance Weighted. Berdasarkan estimasi RMSE tentang nilai Kadar Abu dan ketebalan Batubara metode Ordinary Kriging di PT. Kayan Putra Utama Coal Site Separi di Formasi Balikpapan lebih akurat.
APLIKASI METODE GEORADAR UNTUK IDENTIFIKASI STRUKTUR GEOLOGI DI JALAN HM. ARDAN RING ROAD 1 SAMARINDA Syam, Ardian; Lepong, Piter; Supriyanto, Supriyanto
GEOSAINS KUTAI BASIN Vol 2 No 1 (2019)
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/geofisunmul.v2i1.355

Abstract

Research has been conducted to find out the geological structure on jl. HM. Ardan, Ring Road 1, Samarinda, East Kalimantan. Using Ground Penetrating Radar (GPR) and radar reflection profiling techniques, this method is done by bringing the receiver and transmitter antenna ground simultaneously above level and then utilize the electromagnetic wave propagations for subsurface structures identification, which in this method produce a distance value and depth in the form of radar grams. Based on the results of this study can be identified Track 1 and 2 do not show the path of a geological structure on this track because only the process that resulted in the folding Landing dash that formed folding based on field control. On track 3, based on the reflection pattern, it can be estimated there is a lithological contact between the constituent materials, on track 4 it is estimated that there is a fault down at a depth of 1.6 m to 3 m, and from the reflection pattern can illustrate the lithological contact between constituent rocks. on track 5 and track 6 there is a shallow fault and is estimated based on the diffraction pattern recorded there is a water channel at the end of the track.
STUDI PEMANFAATAN AIR TANAH DAN POTENSI INTRUSI AIR LAUT DI DAERAH PESISIR KOTA BALIKPAPAN Septiardi, Muhammad Evan; Mislan, Mislan; Natalisanto, Adrianus Inu
GEOSAINS KUTAI BASIN Vol 2 No 1 (2019)
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/geofisunmul.v2i1.334

Abstract

Research on the quality of ground water has been performed through boreholes in the city of Balikpapan to find out an indications of the potential of sea water intrusion based on data. The study began with choosing the companies as groundwater user in two places, namely the coastal of manggar and the coastal of the city of Balikpapan. The next steps were to take the drill water samples and examine the quality. The examined were salinity, TDS (Total Dissolve Solid), conductivity and pH of water. The water categories were divided into 3 ie fresh water, with salinity value <1 ppt; brackish with salinity value between 1-3 ppt; and salt water with value> 3 ppt. After those steps the data were interpreted and then contructed to be the image of salinity contour.
INTERPRETASI BAWAH PERMUKAAN MENGGUNAKAN METODE GPR (GROUND PENETRATING RADAR) DI AMBLESAN JALAN RING ROAD II KOTA SAMARINDA Putro, Ari Anggono; Supriyanto, Supriyanto; Rinaldi, Aditya
GEOSAINS KUTAI BASIN Vol 2 No 1 (2019)
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/geofisunmul.v2i1.399

Abstract

This research has been conducted using the Ground Penetrating Radar method to interpretation subsurface conditions that have the potential to become Subsidence on Jalan Ring Road II Samarinda. East Kalimantan, Ground Penetrating Radar Method is a geophysical method that utilizes the propagation of electromagnetic waves to identify subsurface structures, where the recorded penetration of depth and amplitude is affected by the dielectric properties of a material. This study uses an antenna with a frequency of 100 MHz. Based on the interpretation of radar data the potential for a subsidence to occur on track 1 and track 2, in this layer explains that there is a weak field that occurs due to infiltration where the entry of water flow into the soil through the surface of the ground and the condition of the road is steep so that water easily enters the area that has experienced subsidence due to fractures. On lines 3 and 4 there are several different amplitude intervals that are marked by changes in color on radar data which results in factors of material heterogeneity or water content in the layer.
PERUBAHAN PENUTUPAN LAHAN BERDASARKAN ANALISIS CITRA DIGITAL DI DAERAH ALIRAN SUNGAI MAHAKAM Prasetyo, Mohammad Aji; Mandang, Idris; Mubarrok, Saat
GEOSAINS KUTAI BASIN Vol 2 No 1 (2019)
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/geofisunmul.v2i1.335

Abstract

This study aims to analyze the land cover in the Mahakam watershed, East Kalimantan in years of 2003 and 2015 by using data satellite LANDSAT ETM+ image and LANDSAT OLI / TIRS with spatial resolution 30 m. The method used is the initial processing of the image, visual image interpretation, field observations, the determination of sample area, supervised classification using the maximum likelihood method, analysis of accuracy test, reclassification, and analysis of land cover change. Land cover of Mahakam watershed can be classified into 5 type of land cover, namely vegetation, fishpond, settlements, open land and watershed. In 2003, the vegetation area in the Mahakam watershed reached 1.135.629 ha and up to 1.139.318 ha or about 0,53 % in 2015. At the same time, the class of settlement increased from 11.823 ha in 2003 to 79.303 ha in 2015. The land cover of watershed also increased by 6,78 %, from 110.969 ha increasing to 222.560 ha. Open land area has decreased of around 9,77 % or 160.807 ha converted to watershed, vegetation, and settlement.Type of land cover mining has decreased in the period 2003-2015, amounting to 29.177 ha or 1,77 %. Which is converted to vegetation and open land. It shows that land cover change in Mahakam watershed is dominated by open land that is used by the community as settlements, plantations and others.

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