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All Journal BERKALA FISIKA SAINS DAN MATEMATIKA YOUNGSTER PHYSICS JOURNAL Eksergi: Chemical Engineering Journal Syntax Literate: Jurnal Ilmiah Indonesia Journal of Physics and Its Applications Jurnal Riset Teknologi Pencegahan Pencemaran Industri Jurnal Energi Baru dan Terbarukan Eksergi: Jurnal Teknik Energi International Journal of Disaster Management Asian Journal of Social and Humanities
Udi Harmoko
Departemen Fisika, Fakultas Sains Dan Matematika, Universitas Diponegoro, Semarang
Humanities Astronomy Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Other

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Journal : YOUNGSTER PHYSICS JOURNAL

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INTERPRETASI STRUKTUR BAWAH PERMUKAAN BERDASARKAN DATA GEOMAGNETIK PADA DAERAH MATA AIR PANAS JATIKURUNG KABUPATEN SEMARANG Laela Fitria; Tony Yulianto; Udi Harmoko
Youngster Physics Journal Vol 4, No 4 (2015): Youngster Physics Journal Oktober 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The interpretation of subsurface structure and the identification of caused of the hot springs Jatikurung by using magnetic method have been successfully carried out. In this study, magnetic data acquisition was carried out in 71 points by using a PPM (Proton Precession Magnetometer) geometrics type of GSM 19T models to get the values of the total magnetic field. Data processing began with IGRF (International Geomagnetic Reference Field) correction and diurnal correction to get the total magnetic anomaly. The corrected data has been used to create total magnetic anomaly contour. The total magnetic anomaly contour has been used to process reduction to plan surface. The result of reduction to plan surface has been used to create a contour upward continuation and then made reduction to the poles. The result of research showed the total magnetic anomaly closure pair of positive and negative indicated a fault zone below the surface. The closure pair of positive and negative close to the manifestation was made an incision to determine the subsurface structure of the region by creating a model of 2-dimensional (2D) using software Mag2DC. In 2D modeling result show that there was a fault zone about 1200 meters depth. At a depth of 326 to 1200 meters was interpreted as a cap rock with a value 0.2926 (SI). The exhibition of the hot springs Jatikurung was interpreted by the finding of adjacent fault with igneous intrusion which was estimated to save the residual of magma that can be used as a heat source.
INTERPRETASI LAPISAN BAWAH PERMUKAAN DENGAN TRANSFORMASI PSEUDOGRAVITASI BERDASARKAN DATA GEOMAGNETIK PADA MANIFESTASI MATA AIR PANAS KENDALISODO KABUPATEN SEMARANG Nanang Didik Susilo; Muhammad Irham Nurwidiyanto; Udi Harmoko
Youngster Physics Journal Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Kendalisodo’s area has geological structures which formed by volcanic Ungaran there are hot springs manifestations has been do secondary geomagnetic data processing obtained in the measurement in Kendalisodo Semarang District. The study aims to interpret the subsurface conditions around the hot springs area Kendalisodo caused the emergence of the hot springs in the area. A total of 63 data points that have been corrected International Geomagnetic Reference Field (IGRF) and daily variation correction is used to make the contours of the total magnetic field anomalies. Contour anomaly magnetic field is then processed using a upward continuation filter, reduction to the pole filter, pseudogravity transformation filter, horizontal and second vertical gradient derivative filter. The results of data processing in the form of total magnetic field anomalies that indicate closure pair of positive and negative closure indicating the fault zone below the surface. This interpretation is supported by the contour anomalyand pseudogravity contour, horizontal gradient which shows that there is a fairly strong density contrast and vertical gradient analysis of the order of two indicates that the fault is a reverse fault type. The interpretation is reinforced also by modeling results that indicate a fault that appears on the rock Gajahmungkur and kaligetas formations in the area Kendalisodo trending northwest-southeast. This fault zone is a media outlet fluid to the surface that appears as the source of the hot springs
Analisis preservasi amplitudo dan resolusi seismik pada data hasil reconvolution lapangan “X” Cekungan Sumatera Tengah Agus Muhidin; Udi Harmoko; Hernowo Danusaputro; Moh. Irfan Saputra Haris
Youngster Physics Journal Vol 6, No 1 (2017): Youngster Physics Journal Januari 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Structure interpretation of post-stack seismic data to delineate lithology boundary sometimes face difficulties in tracking reflector continuity, this is due to limitation of vertical resolution.  Reconvolution method has been applied to fix vertical seismic resolution. In order to validate the function reconvolution to amplitude related interpretation, amplitude variation with offset (AVO) has applied to geology model.  Reconvolution method was applied by increasing dominant frequency of seismic data and capable to minimize tuning thickness zone of geology model has been made. Modeling geology based on average of P velocity, S velocity, and density from field “X” well data and estimating P velocity, S velocity and density for fluid condition of reservoir. AVO analysis has been applied to validate how far reconvolution method capable to maintain amplitude behavior, AVO analysis using Zeoppritz equation in 10 to 30 degree angle and using intercept attribute (A), gradient (B) and product (A*B). Reconvolution method has used 50 Hz, 60 Hz, 65 Hz, and 70 Hz of wavelet.  Reconvolution method capable to fix vertical seismic data resolution, it can be seen by decreasing of tuning thickness from 16 to 14 meters. Based on AVO analysis that be used for validate reconvolution method is showing intercept (A) and gradient (B) value be affected by fluids condition in reservoir and presence the random noise in the seismic data. Intercept (A) and gradient (B) for reconvolved data do not have significant changes. However, wavelet has used in reconvolution that possess the smallest error value is wavelet with dominant frequency in 60 Hz and 65 Hz.Keywords: Structure interpretation, Tuning thicknes, Recovolution, and AVO analysis. 
INTERPRETASI GEOLOGI BAWAH PERMUKAAN DAERAH POTENSI MATA AIR PANAS KALIULO KABUPATEN SEMARANG BERDASARKAN DATA GEOMAGNET MENGGUNAKAN MODEL 2-D & 3-D Diny Agustina Rahayu; Udi Harmoko; Tony Yulianto; Sugeng Widada; Yusuf Dewantoro
Youngster Physics Journal Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The geothermal hot springs has been discovered in the Kaliulo area, Pringapus district of Semarang Regency. The research was conducted by 2-D and 3-D model geomagnetic for find the geological subsurface structure. Observation data such as magnetic field of 61 point used one set of PPM (Proton Precission Magnetometer) GSM geometrics 19 T and two units Geotron Magnetometer Model Unit G5. Data analysis of geomagnet was undertaken by diurnal correction and IGRF (International Geomagnetic Reference Field) correction to obtain the total of magnetic field anomalies. The total magnetic field anomaly data were utilized to create anomaly contour. That anomaly is used for doing reduction to plansurface process, upward continuation that produce anomalies local and regional, and reduction to pole. Modeling was done on the local magnetic anomalies to review subsurface using Mag2DC and UBC Mag3D. The results showed the + (positive) closure and – (negative) closure that can indicate anomalies object in other word to be weak zone or geological structure of fault is available, so that the slicing is made on that closure. Based on the model 2-D normal fault structure the northwestsoutheast trending and northeast-southwest, this interpreting so that normal faults which controlled source hot springs Diwak to Kaliulo.  
IDENTIFIKASI PANAS BUMI DIWAK DAN DEREKAN KECAMATAN BERGAS KABUPATEN SEMARANG DENGAN MENGGUNAKAN METODE AUDIOMAGNETOTELLURIK Elvera Yuanita Rukmana; Udi Harmoko
Youngster Physics Journal Vol 3, No 4 (2014): Youngster Physics Journal Oktober 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Audio-Magnetotellurics (AMT) surveys has been conducted in September 2013 in the Diwak and Derekan geothermal fields. The purpose  of the audio-magnetotelluric surveys to indicate heat source, reservoir, and cap rock. The data obtained from the field was apparent resistivity, phase difference, and coherence as a function of frequency are processed using softwere package WinGLink then matched with regional geological information studies, and the results are interpreted.Characterization of geothermal systems include the caprock with a resistivity of 0-10Ωm value where the area is a zone of conductivity. Then the reservoir area is suspected to have a resistivity value with arange of 50-500 Ωm with a depth of about 500 m. In the heat source located in a geothermal system resistivity values > 500Ωm with a depth of about 1.5 km. Keywords: AMT, geothermal, resistivity
PERBANDINGAN POST STACK TIME MIGRATION METODE FINITE DIFFERENCE DAN METODE KIRCHOFF DENGAN PARAMETER GAP DEKONVOLUSI DATA SEISMIK DARAT 2D LINE “SRDA” Sheyza Rery Dynza Anggary; Hernowo Danusaputro; Udi Harmoko
Youngster Physics Journal Vol 4, No 1 (2015): Youngster Physics Journal Januari 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

ABSTRACT           Analysis on Post Stack Time Migration (Post-STM) with finite difference method and Kirchoff method with determine gap parameter on deconvolution after stack had been applied to 2D land seismic at line “SRDA”. This research had purpose to applied seismic data processing to get subsurface imaging with high signal-to-noise ratio and analyze how the gap parameter corresponding on deconvolution after stack, and to determine which the appropriate method of migration between migration finite difference and Kirchoff migration in Post Stack Time Migration (Post-STM).         Gap parameter selected in the deconvolution process after the stack is a gap 24, 32 and 64. Based on the analysis of the three parameters were chosen gap 32 which has the best results because the gap 32 in accordance with the conditions of the data and the effect does not change the condition of reflectors on seismic cross section. While the migration phase, the results better structure when subjected Kirchoff migration method, because it is more obvious than the reflector continuity migration finite difference method. Keywords: Deconvolution after stack, Post Stack Time Migration
Identifikasi sifat fisis batuan reservoir karbonat menggunakan inverse acoustic impedance (AI) model sparse spike pada lapangan “ABDUH” formasi Kujung Cekungan Jawa Timur Utara Saad Abdurrahman; Udi Harmoko; Agung Ardiyanto
Youngster Physics Journal Vol 6, No 2 (2017): Youngster Physics Journal April 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Physical rocks properties identification on "ABDUH" field, North East Java Basin has been done by acoustic impedance seismic inversion. The research aim conducted to predict the physical properties of rock by  acoustic impedance inversion value and the porosity distrubution by linier programming sparse spike. Sparse spike linear programming method assumes that a reflectifity regarded as the model a series of rarely spike and the big value deconvoluted with a new spike smaller than before maked it more accurated. This study used at single well and seismic 3D data post stack time migration is the area on research. Then with assumes a linear relationship between acoustic impedance and log porosity log based crossplot, obtained linear equation which was used to get the distribution of porosity from the distribution of acoustic impedance. Inversion results show the distribution of reefs on Kujung Reef formation has the porosity value 21-27% and the acoustic impedance vaue 17.000 to 28.000 ft/s.g/cc.Keywords: Acoustic Impedance, Kujung Reef, Porosity, Linier Programming Sparse Spike Inversion
STUDI ALIRAN FLUIDA MANIFESTASI PANAS BUMI DESA DIWAK DAN DESA DEREKAN, KECAMATAN BERGAS, KABUPATEN SEMARANG MENGGUNAKAN METODE TAHANAN JENIS 3D. Hotlan Simbolon; Udi Harmoko; Gatot Yulianto; Sugeng Widada; Yusuf D. H.; Sahid Sahid
Youngster Physics Journal Vol 4, No 1 (2015): Youngster Physics Journal Januari 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

This research use geolistric method that aims to analize the system of manifestation of fluida distribution geothermal on Diwak, Derekan Central Java, based on measurement of geolistric 3-D with pole - pole configuration, has been done. Data processing is performed using software Res3dinv and surfer which results in a horizontal and vertical cross-section. The results of the interpretation of 2D processed by software rockwork to obtain 3-D cross-section. The results showed that the measurement point 1, the direction of the fluid flow toward the east. Measurement point 2, the direction of flow of the fluid toward the northwest, the fluid flow direction to both of the points towards Lutung river. Keywords : Fluida, pole-pole konfiguration, Diwak, Derakan
IDENTIFIKASI STRUKTUR BAWAH PERMUKAAN MENGGUNAKAN METODE GEOLISTRIK KONFIGURASI SCHLUMBERGER DI AREA PANASBUMI DESA DIWAK DAN DEREKAN KECAMATAN BERGAS KABUPATEN SEMARANG Sigit Darmawan; Udi Harmoko; Sugeng Widada
Youngster Physics Journal Vol 3, No 2 (2014): Youngster Physics Journal April 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Diwak and Derekan is one of geothermal manifest which exist in geothermal system of Ungaran. Geoelectric method schlumberger configuration is one of the geophysical methods that used in the exploration of natural resources below the surface. The purpose of researching is to know layer of subsurface structure which control Diwak and Derekan geothermal manifest.Field measurement data in the field are potential differences and currents which can be used to calculate apparent resistivity value. After apparent resistivity value is created then processed using IPI2WIN program to know resistivity value in each layer with geology information validation.The results of the study showed six geoelectric layer of rock that is composed of layers of mudstone, siltstone, tuff, sandstone brecia and pasirtuf with resistivity values and different thicknesses. Interpretation of manually indicate the presence of two down faults that are weak zone where the fluid surface discharge Keyword: Geoelectric, Schlumberger, Geothermal, Fault, Diwak and Derekan
PENCITRAAN STRUKTUR BAWAH PERMUKAAN KOMPLEKS MENGGUNAKAN METODE PRE-STACK DEPTH MIGRATION DENGAN ALGORITMA HORIZON BASED TOMOGRAPHY PADA LAPANGAN “MF-3D” Muhammad Fahmi; Hernowo Danusaputro; Udi Harmoko
Youngster Physics Journal Vol 1, No 1 (2012): Youngster Physics Journal Oktober 2012
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

A research in “MF-3D” field under Pre Stack Depth Migration method for 3D seismic reflection data has been carried out. PSDM selected to describing to perfect subsurface structure that obtain. This research aimed to applying initial interval velocity model determination method in PSDM to obtain better imaging subsurface structure with lateral velocity variation. Initial interval velocity model determination method which used was Dix Transformation and Constrained Velocity Inversion (CVI). Velocity model is quite sufficient to determining interval velocity in shallow layer and inclined flat under Dix Transformation. However, Dix Transformation precisely obtains less sufficient and unstable interval velocity in deeper subsurface layer. CVI conducted to determining initial interval velocity model which required to obtaining better and stable interval velocity in deeper subsurface layer. Both models required to obtaining initial model of 3D seismic section in depth domain as PSDM result. That model will get correction by using Horizon Based Tomography Algorithm in further step. This research yields initial 3D interval velocity model as input for PSDM process. Key Word: Pre Stack Depth Migration (PSDM), Constrained Velocity Inversion (CVI), Horizon Based Tomography
Co-Authors . Sahid Achmad Syaifuddin Zuhri Achmad Widodo Aditya Firdaus Agung Ardiyanto Agus Muhidin Agus Muhidin Agus Setyawan Agus Subagio Akrima Amalia Alchacindy Guenergar Anjar Oktikawati Aprilla, Arga Nanda Asronj Bakkit Simanjuntak Berkah Fajar Tamtomo Kiono Cassandra Fitrianna Idat Dewi Andri Dian L Silalahi Diny Agustina Rahayu Djalal Er Riyanto Elvera Yuanita Rukmana Faradina A. P. Fazrin Oktafian Galih Candra Kusuma Gatot Yulianto Hadiyanto Harefa, Jonius Christian Herman Tolle Hernowo Danusaputro Hiskia Anggit Maulana Hotlan Simbolon I Gusti Ngurah Antaryama Ibnu Rasid Imam Baru Raharjo Imroatun Nikmah Iqbal Takodama Irham Nurwidyanto Irvan Ramadhan Istiqomah Ari Kusuma Iut Triutami Ivan Darren Alber Iwan Gunawan Jaka Windarta Jatmiko Endro Suseno Jonius Christian Harefa Laela Fitria Lestari, Puspa Luxy Rizal Fathoni M. Razi Maila Shofa Marcelinus Christwardana Mars Widodo Moch. Abdul Mukid Mochammad Fa'iq Khasmadin Moh. Irfan Saputra Haris Mohammad Sidik Mualimin Mualimin Muhammad Irham Muhammad Irham Nurwidiyanto Muhammad Nur Muhammad Ulin Nuha ABA Mustafid Mustafid Nabil Bawahab Nanang Didik Susilo Nurjannah Nurjannah Nurwahyudin, Dindin Syarief Pradipta Ahluriza Ramadhani, Naufal Helmi Ramdani Alfan Subekti Redemtus Heru Tjahjana Rezyta Handani Ririn Sulpiani Rizkan, Muhammad Riznia Aji Salam Rr. Tony Yulianto Saad Abdurrahman Sahid Sahid Sari, Rendi Pradila Hab Satriyo Adhy Setyowati, Alvira Galihputri Sheyza Rery Dynza Anggary Sigit Darmawan Siti Helmyati Siti Zulaikhah Sri Widodo Agung Suedy Sudarno Sudarno Sugeng Widada Sujarwo Sujarwo Sukir Sukir Susantoro, Tri M Syamsul Ilmi Teguh Suroso Teguh Suroso Tony Yulianto Triana Triana Veratania Aisyah Veratania Aisyah Vithya Arintalofa Wahyu Festiawan Nurrochim Yose Rizal Triarto Yundari, Yundari Yusuf D. H. Yusuf Dewantoro Herlambang