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Piter Lepong
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Pemilihan Semivariogram Terbaik Berdasarkan Root Mean Square Error (RMSE) pada Data Spasial Eksplorasi Emas Awak Mas Emy Khairil Hendarwati; Piter Lepong; Suyitno Suyitno
JURNAL GEOSAINS KUTAI BASIN Vol 6 No 1 (2023)
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.v6i1.1072

Abstract

Semivariogram merupakan perangkat dasar geostatistik yang digunakan untuk memvisualisasi, memodelkan, dan menghitung autokorelasi spasial dari antar data dalam suatu variabel. Semivariogram dibedakan menjadi dua, yaitu semivariogram eksperimental dan semivariogram teoritis. Terdapat tiga jenis model semivariogram teoritis, yaitu model spherical, model eksponensial, dan model gaussian. Penelitian ini bertujuan untuk menentukan model semivariogram terbaik berdasarkan nilai RMSE terkecil. Data penelitian ini adalah data sekunder eksplorasi emas yang terdiri dari data drillhole sebanyak 101 data. Proses pemilihan model semivariogram dimulai dengan menghitung semivariogram eksperimental, melakukan analisis struktural dengan mencocokkan kurva semivariogram eksperimental dengan kurva semivariogram teoritis model spherical, model eksponensial, dan model gaussian, diperoleh nilai nugget, sill, dan range pada masing – masing model semivariogram, menghitung nilai RMSE pada model spherical, model eksponensial, dan model gaussian. Nilai RMSE pada model spherical sebesar 0,3259, model eksponensial sebesar 0,2655, dan model gaussian sebesar 0,3224. Berdasarkan hasil RMSE, model semivariogram terbaik dengan nilai RMSE terkecil adalah model eksponensial.
KAITAN INTENSITAS HAMBURAN SINAR GAMMA TERHADAP SIFAT FISIS BATUAN Merryana Desidoria Sitorus; Adrianus Inu Natalisanto; Piter Lepong
JURNAL GEOSAINS KUTAI BASIN Vol 1 No 2 (2018)
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.v1i2.283

Abstract

Information on the intensity of gamma-rays scattered by the rock formation is contained in the density-log which is the output of a well logging system. In this research it was studied the relation of the intensities with the physical properties of the rocks in a rock formation. The study was performed by determining the intensities of gamma-rays scattered recorded in the data of density-log’s curves and continued by analyzing the rock’s physical properties that might decrease the intensities of gamma rays, such as molecular weight, coefficient of attenuation, and scattering cross-sectional. Result of the research was the graph which can be used to predict the properties of any sediment rocks by only using the scattered gamma ray intensities recorded in the data of density log.
STUDI LINGKUNGAN PENGENDAPAN MENGGUNAKAN DATA GEOFISIKA LOGGING DI PT. ADIMITRA BARATAMA NUSANTARA KALIMANTAN TIMUR Galih Adenanthera Tamarindi Rachman Putr; Supriyanto Supriyanto; Piter Lepong
JURNAL GEOSAINS KUTAI BASIN Vol 3 No 2 (2020)
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.v3i2.691

Abstract

This research conducted at PT. Adimitra Baratama Nusantara which is located in the Balikpapan formation and based on the administrative map of PT. Adimitra Baratama Nusantara is located in Sanga-Sanga, Kutai Kartanegara Regency, East Kalimantan Province. This study uses logging geophysical data in the form of log gammaray and log density where in this logging analysis aims to determine the direction of the spread of the layer by using correlation and to determine the depositional environment at the study site. The results obtained in this study based on logging geophysical data is the correlation of the distribution layer to the northeast and the depositional environment contained is the lower delta plain depositional environment, this is because the characteristics of the lower delta plain depositional environment are thin coal and medium-sized sandstone. . The lower delta plain environment is affected by shallow water when the bay is filled with sediment.
ANALISA STRUKTUR BAWAH PERMUKAAN DAERAH PROSPEK PANAS BUMI “GF-TNH” SUMATERA BARAT BERDASARKAN METODE GAYA BERAT Adi Buchori Ramadhan; Djayus Djayus; Piter Lepong
JURNAL GEOSAINS KUTAI BASIN Vol 3 No 1 (2020)
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.v3i1.594

Abstract

The gravity method is one of the geophysical exploration methods based on the Earth's gravity field anomaly caused by variations in rock mass density laterally and vertically below the measuring point. The study area has a range of complete bouguer anomaly of -48.3 mGall up to -4.0 mGall and depth estimation with spectrum analysis showing a regional anomaly depth value of 2.43 km and a residual anomaly depth of 0.77 km which is interpreted as a boundary zone between bedrock and subsurface rocks that have more varied anomaly values. Then the separation of regional and residual anomaly was carried out using the Butterworth Filter and Second Vertical Derivative methods. From the results of the residual anomaly map shows the range of anomaly values ​​-0.5 mGall to 4.0 mGall. The map of residual anomaly shows a more complex pattern of anomaly because residual anomaly provide a lateral representation of rock mass distribution or the presence of geological structures below the surface that are relatively close to the surface of the earth. Then the residual anomaly map is made 3D inversion modelling with Second Vertical Derivative Technique to find out the fault and its type, then Derivative Analysis is performed. The geological structure in the study area is based on the results of inversion modelling and derivative analysis, dominated by faults and the type of fault is reverse fault and normal fault and the type of rock is dominated by igneous rock which has a high density value.
Analisis Potensi Swabakar (Self-Combustion) Berdasarkan Data Proksimat pada Batubara PT. Geoservices Samarinda Wahidah Wahidah; Delia Aurora Fajarwati; Piter Lepong; Andi Alamsyah
JURNAL GEOSAINS KUTAI BASIN Vol 5 No 2 (2022)
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.v5i2.1062

Abstract

The self-combustion phenomenon that has the potential to cause fires in the coal mining industry in East Kalimantan is the subject of this study. The purpose of this study is to determine the quality and characteristics of coal that has the potential to trigger self-heating. In this research, 5 (five) samples of coal quality are analyzed from PT. Geoservice Samarinda using the proximate analysis method and analysis of calorific value and total sulfur. Next, determine ranking of coal and analyze the characteristics of coal samples that are prone to potential self-combustion. The results show that the five coal samples included in Sub-Bituminous rank with medium volatile matter considered to have sufficient potential to experience self-combustion. The most susceptible coal sample is sample code D1 because it also has lower inherent moisture and ash content and higher total sulfur content than other coal samples. However, further tests still need to be carried out to determine the percentage of total sulfur (pyrite) as a trigger for self-combustion. Environmental factor analysis is also required for validation.
IDENTIFIKASI KAWASAN ZONA PANAS BUMI (GEOTHERMAL) DI DAERAH X MENGGUNAKAN METODE MAGNETOTELLURIK Dela Andini; Piter Lepong; Adrianus Inu Natalisanto
JURNAL GEOSAINS KUTAI BASIN Vol 3 No 1 (2020)
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.v3i1.599

Abstract

Geothermal is the heat formed inside the earth's crust. The heat of geothermal produces hot water, steam, and heat rocks along with other minerals and gases to be genetically inseparable in geothermal systems. One of the geophysical method which can be used to determine the area of a geothermal system is magnettoteluric. The method is based on the values of resistivity distribution of the rock formation. In the study on the identification of geothermal zone in the X area, it was found the resistivity distribution in 1D and 2D models by using the magnettoteluric method. The models were created by processing of magnettoteluric data taken from three measuring lines. The 1D model was the resistivity distribution vertically generated from the depth of each measurement point, while the 2D model was the resistivity distribution generated in vertical and lateral to form the image of geothermal system. In the 1D model the resistivity distribution values were in the range of 66 ohm.m and 270 ohm.m, while in the 2D model the resistivity distribution values were in the range of 66 ohm.m and 221 ohm.m. From the image it could be interpreted the low resistivity related to the cap rock zone located above the reservoir zone, the medium resistivity related to the reservoir zone located below the cap rock zone, and the high resistivity related to the heat source zone located below the reservoir zone. The study found that the position of geothermal reservoir was under the cap rock zone.
ANALISIS PENYEBARAN SIFAT FISIS BATUAN RESERVOIR DENGAN METODE GEOSTATISTIK (STUDI KASUS: LAPANGAN BOONSVILLE, TEXAS, AMERIKA SERIKAT) Claudia Dewi Puspita Sari; Piter Lepong; Adrianus Inu Natalisanto
JURNAL 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.
IDENTIFIKASI ZONA MINERAL BIJIH BESI BERDASARKAN PEMODELAN INVERSI 3D MENGGUNAKAN METODE MAGNETIK Muhammad Ramadana; Piter Lepong
JURNAL GEOSAINS KUTAI BASIN Vol 1 No 2 (2018)
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.v1i2.284

Abstract

The geomagnetic method is one of the geophysical methods based on measurement of the variation of the intensity of the magnetic field at the Earth's surface caused by the existence of variations have been magnetized objects distribution under the Earth's surface. Added to the results of a study of literature method of gravity as the comparison data to see the structure of the research area on a regional basis. From the results of gravity anomaly values obtained residual (High Pass Filter) using Gaussian filtering of local gravity values obtained range between -25 mGal until 16,1 mGal at a depth of 1,2 km on a regional basis have geological structures that affect the shape of the rock formations in the area of research is the result of the adoption of rock (intrusion) and from the results of magnetic inversion models 3D mineralized zone indication obtained iron ore to the value suseptibilitas range between 0.01 until 0.02556.
INTERPRETASI KECEPATAN GELOMBANG SEISMIK REFRAKSI TOMOGRAFI DALAM PENENTUAN LITOLOGI BAWAH PERMUKAAN DI DESA BHUANA JAYA (STUDI KASUS : PT. KHOTAI MAKMUR INSAN ABADI) Fitria Nova Linda; Piter Lepong; Djayus Djayus
JURNAL GEOSAINS KUTAI BASIN Vol 2 No 2 (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.v2i2.473

Abstract

Research has been carried out to determine the subsurface lithology including rock type, rock layer thickness, weathered layer, and rock hardness level based on wave velocity seismic refraction tomography at Bhuana Jaya Village, PT. Khotai Makmur Insan Abadi by using the seismic refraction method. The measurement in this study uses the In Line technique, where geophone equipment is arranged in a straight line with 3 and 5 meters spacing between the geophone. Based on the results of study, there are two types of morphology namely hill and rice field areas. Hill area is interpreted which have lithology, the first layer has a thickness of less than 3 m with lithology in the form is soil as a weathered layer, the second layer has a thickness of less than 2 m with lithology in the form is siltstone, the third layer has a thickness is less than 9 m with lithology in the form is mudstone, and the fourth layer has a thickness of less than 9 m with lithology in the form is sandstone, where this area is located at very hard rock. While rice field areas are interpreted which have lithology, the first layer has a thickness of less than 10 m with lithology in the form is alluvium as a weathered layer and the second layer has a thickness of less than 10 m with lithology in the form is siltstone with sandstone inserts, where these areas are located at an easy to medium level of hardness.
APLIKASI METODE GEORADAR UNTUK IDENTIFIKASI STRUKTUR GEOLOGI DI JALAN HM. ARDAN RING ROAD 1 SAMARINDA Ardian Syam; Piter Lepong; Supriyanto Supriyanto
JURNAL 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.
Co-Authors Adi Buchori Ramadhan Aditya Rinaldi Adrianus Inu Natalisanto Andi Alamsyah Ani Amalia Ardian Syam Claudia Dewi Puspita Sari Dela Andini Delia Aurora Fajarwati Depi Rusmilawati Djayus Djayus Edberg Situmeang Emy Khairil Hendarwati Fitria Nova Linda Galih Adenanthera Tamarindi Rachman Putr Hasani, Ruslan Laksono Trisnantoro Merryana Desidoria Sitorus Muhammad Dayattullah Muhammad Ramadana Nor Laila Nurvani Antony Penta Adenata Maulidsandy Rahmiati Munir Risky Maulana Sri Rezeki Julianti Supriyanto Supriyanto Suyitno Suyitno Wahidah Wahidah