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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 Energi Baru dan Terbarukan Eksergi: Jurnal Teknik Energi Asian Journal of Social and Humanities
Udi Harmoko
Departemen Fisika, Fakultas Sains Dan Matematika, Universitas Diponegoro, Semarang
Humanities Astronomy Chemical Engineering, Chemistry & Bioengineering 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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Analisis Velocity Model Building Pada Pre Stack Depth Migration Untuk Penggambaran Struktur Bawah Permukaan Daerah ”x” Triarto, Yose Rizal; Danusaputro, Hernowo; Harmoko, Udi
BERKALA FISIKA Vol 13, No 1 (2010): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Pre Stack Depth Migration method has been carried out for 2D seismic reflection data on Line KPH-11807 at “X” area. This method was chosen for reconstruction geology features and imaging the subsurface structure. Based on previous investigation which done October, 2004-January, 2005, Line KPH-11807 at “X” area was a potential development as hydrocarbon prospect area which complex geology structure and strong lateral velocity variations. In the same area has been done previously with Pre Stack Time Migration by Elnusa Geosains, PT. Therefore the result of the PSDM can be compared to PSTM method. Seismic section with complex geology structure and/or strong lateral velocity variations area, which often there are at seismic data migrated stack can be overcome using an accurate velocity model. Velocity model building with the IVMB (interval velocity model building) concept consist of the coherency inversion and global tomography yield the right subsurface geological model. Hereinafter the velocity model will be used for the PSDM (pre stack depth migration) process. Result of PSDM shows a significant image enhancement, able to assure the reflection pattern at the horizons with strong lateral velocity variations and give the more coherence resolution compared with Pre Stack Time Migration seismic data. This study is very valuable in building exploration concept and development of the area, especially in a complex structure with strong lateral velocity variations.   Keywords: PSDM, velocity model building.
INVERSI IMPEDANSI ELASTIK UNTUK MENGESTIMASI KANDUNGAN RESERVOIR BATUPASIR LAPANGAN “Ve” FORMASI CIBULAKAN CEKUNGAN JAWA BARAT UTARA Aisyah, Veratania; Harmoko, Udi; Mualimin, Mualimin
BERKALA FISIKA Vol 14, No 3 (2011): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

An Elastic Impedance inversion was carried out  to determine sandstone reservoir characterization of “Ve” Field Cibulakan Formation, Northwest Java Basin. There are many steps of data processing to analize a well log data in order to get sensitive angle of lithologic characterization. Mudrock Line equation was applied to obtain Vs log data of the research target zone. The next step, we did Well seismic tie toobtain horizon that approach the real geological zone. Initial model was made by used a control well andDST 5 horizon. Sparse Spike inversion gives the most accurate result than two other one. According to thevolume inversion, we plotted to a map show the contrast of sandstone lithology. Based on Elastic Impedanceinversion analysis, we estimate the rangeof sandstone reservoir impedance:1348 (m/s)gr/cc – 1365(m/s)2gr/cc. Crossplot analysis result between log Elastic Impedance and log Gamma Ray shows that 35isthe best angle of the sandstone and shale lithologic sparation.Keyword: Elastic Impedance, AVO, inversion, Mudrock Lin
Solving a system of linear equations by QR Factorization Method for Temperature and Altitude Regression Model against Spontaneous-Potential Widowati, Widowati; Setyawan, Agus; Mustafid, Mustafid; Nur, Muhammad; Sudarno, Sudarno; Harmoko, Udi; Adhy, Satriyo; Gunawan, Gunawan; Subagio, Agus; Tjahjana, Heru; Sulpiani, Ririn; Riyanto, Djalal Er; Suhartono, Suhartono; Mukid, Mochammad Abdul; Suseno, Jatmiko Endro
JURNAL SAINS DAN MATEMATIKA Volume 22 Issue 3 Year 2014
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

Many real problems can be represented in the form of multiple linear regression equation. One of those is the relationship between the variables of temperature and altitude of the spontaneous-potential. In order to determine the parameters of the regression equation, the least squares method was used. From here, there was obtained the system of linear equations. In this paper, to solve systems of linear equations, the exact method was used as the exact solution is certainly better than the approached solution. The method used was the QR factorization method. At the QR factorization, the system of linear equations was written in form of matrix equation. Then, the coefficient matrix which the number of rows is m and number of columns is n with linearly independent columns was factored into the matrix Q which has the same size with the matrix A, with orthonormal columns and matrix R was upper triangular. Furthermore, by backward substitution, it could be obtained the exact solution of linear equation system. As verification of this proposed method, a case study was given using data of temperature, altitude, and spontaneous-potential in the geothermal manifestations area, Gedongsongo, Mount Ungaran Semarang. From here, it was obtained the parameters of exact multiple linear regression model which states the relationship between temperature and altitude toward the spontaneous-potential.
STUDI DISTRIBUSI TEMPERATUR PERMUKAAN DANGKAL, EMISI GAS KARBONDIOKSIDA DAN POLA ALIRAN FLUIDA UNTUK MENGKLARIFIKASI SISTEM PANAS BUMI DI DAERAH MANIFESTASI DIWAK-DEREKAN, JAWA TENGAH Imroatun Nikmah; Udi Harmoko
Youngster Physics Journal Vol 3, No 1 (2014): Youngster Physics Journal Januari 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The research on temperature, carbon dioxide emissions (CO2) and fluid flow has been done at the site of geothermal manifestations Diwak-Derekan by using three methods: shallow surface temperature method, emissions of carbon dioxide (CO2) and Advance Groundwater (water level). The purpose of this study is to determine the temperature distribution, the emission of carbon dioxide (CO2) and fluid flow in the area Diwak-Derekan to get a conceptual model of the geothermal system.The shallow surface temperature measurement, emissions of carbon dioxide (CO2) and water table at the site of geothermal manifestations Diwak-Derekan has done with maps and put them in a third compiles data on height topography data.The result of study, in the manifestation area obtained result distribution of shallow surface temperature is about 30,77 oC (Diwak) and 30,64 oC (Derekan) with emission of carbon dioxide (CO2) is about 9%. And for water level measurement indicates that the flow of shallow ground water is coming from the west location of manifestations and mixed with hydrothermal fluids which then turn up to the surface as hot springs.Keywords: shallow surface temperatures, emissions of carbon dioxide (CO2), ground water, geothermal.
ANALISA 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 4, No 1 (2015): Youngster Physics Journal Januari 2015
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
INVERSI IMPEDANSI ELASTIK UNTUK ESTIMASI KANDUNGAN RESERVOIR BATUPASIR LAPANGAN “Ve” FORMASI CIBULAKAN CEKUNGAN JAWA BARAT UTARA Veratania Aisyah; 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

An Elastic Impedance inversion has been done for determine sandstone reservoir characterization of “Ve” Field Cibulakan Formation Northwest Java Basin. Amplitude Variation with Offset (AVO) inversion is done for determining Elastic Impedance reflectivity, near angle stack, mid angle stack, and far angle stack. Moreover Elastic Impedance inversion is done for determining Elastic Impedance volume. With DST 5 horizon for obtaining structure and slicing map to determine separating lithology of sandstone reservoir. In this research used seismic data and well data which only have a well. The step of data processing by analizing well data in order to get sensitive angle in separating lithology of sandstone and shale. Mudrock Line equation is used for this research because the available of log Vs can not reach the research target zone. Well seismic tie is done for obtaining horizon that approach the real geological zone. Initial model is made by used a control well and DST 5 horizon. From three inversion has been done Bandlimited, Sparse Spike, and Model Based inversion, Sparse Spike inversion is inversion method which gives accurate result. From that result of inversion volume is used for making slicing map intent on knowing of sandstone lithology separated. Based on analysis of Elastic Impedance inversion that content estimation of sandstone reservoir be in layer which have impedance 1348 (m/s)2gr/cc – 1365 (m/s)2gr/cc. Crossplot analysis result between log Elastic Impedance and log Gamma Ray shows that angle 350 is the best angle parameter in separating lithology of sandstone and shale. And from slicing map analysis on DST 5 horizon shows that zone distribution of sandstone reservoir have oriented north untill northeast.   Keyword: Elastic Impedance, AVO, inversion, Mudrock Line
Pemodelan 2D sistem pana bumi daerah Garut Bagian Timur menggunakan metode magnetotelurik Riznia Aji Salam; Udi Harmoko; Tony Yulianto
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

This research was conducted in the eastern part of the Garut area using magnetotelluric method that aims to create 2D model of the geothermal system based on distribution of rock resistivity value. Magnetotelluric method is used because it is able to identify subsurface structure to a depth of thousands of meters. In this research, the data measured from 9 different targets area and processed based on the flow such as converting time domain data into the frequency domain, identify noise data, perform two-dimensional inversion modeling and create geothermal systems. Based on the results, also compared with the interpretation of geological data and geochemistry of rocks known clay cap, reservoir, and hot rock. Furthermore, Clay cap has a value of 4-32 Ωm resistivity on depth of 3000 m. Reservoir rock with resistivity value of 64-512 Ωm at a depth of 1500-5000 m. While hot rock with 1024-8192 Ωm resistivity value is under the reservoir rock.Keywords: Magnetotelluric, Eastern section of the Garut, geothermal system, resistivity
RELOKASI HIPOSENTER GEMPA MIKRO DENGAN METODE SED DAN JHD SEBAGAI ANALISIS RESERVOAR AREA PANAS BUMI-X Cassandra Fitrianna Idat; Udi Harmoko
Youngster Physics Journal Vol 5, No 3 (2016): Youngster Physics Journal Juli 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Mount Wayang and Windu, located about 35 kilometers south of Bandung, the capital of West Java, Indonesia. This area included in a set of active hydrothermal geothermal area around South Bandung. Microearthquake network is a collection of microearthquake recording station that has been used from 1960. Data from this network of micro earthquakes can predict permeable structure in the reservoir, which is as monitoring the pattern of fluid flow and reservoir limits, called cap rock that is impermeable. Analysis of seismic activity in micro earthquake data that is in determining the location of the hypocenter, for determining the location of the hypocenter can complicate the interpretation of the structure. Methods Single Event Determination (SED) and the Joint Hypocenter Determination method (JHD) can optimize the location of the hypocenter with a correction to the 1-D velocity model. There are 160 events were recorded from January 2014 to April 2014. The data is processed so that there are 55 local earthquake event data were inverted to obtain new hypocenter location using the SED and JHD. The second result of inversion produces more accurate hypocenter locations with a reservoir that has a moment epicenter distribution pattern direction Northwest - Southeast. Long reservoir SED results estimated 25 km with a depth of permeable zone of 20 km, whereas after correction obtained JHD same length but permeable zone is detected to a depth of 26 km. Keywords: Joint Hypocenter Determination, Single Event Determination, Microearthquake, Geothermal.
INTERPRETASI LAPISAN BAWAH PERMUKAAN DI AREA PANAS BUMI GUNUNG TELOMOYO, KABUPATEN SEMARANG MENGGUNAKAN METODE GEOLISTRIK RESISTIVITY KONFIGURASI SCHLUMBERGER Elida Septiana Putriutami; 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

Geoelectric measurements and interpretation have been conducted to obtain subsurface structure information in Geothermal area of Telomoyo Mountain at Semarang regency using Schlumberger configurationWe obtain a potential difference and current from field data acquisition that can be used to calculate the apparent resistivity value. Then, the apparent resistivity value is processed using IPI2win program to determine the value of resistivity in each layer using geological information as validation. The geoelectric results showed the presence of fault structures such as normal faults down and the layers which has resistivity values at 116 Wm with a depth at 106 - 120 m from the surface of geoelectric line are interpreted as the upper boundaries of the Caprock layer. Keywords: Resistivity, Schlumberger, Geothermal, Telomoyo Mountain
VERTICAL TRANSVERS ISOTROPY (VTI) PRE STACK DEPTH MIGRATION ANISOTROPI UNTUK PENCITRAAN STRUKTUR BAWAH PERMUKAAN YANG LEBIH AKURAT Ibnu Rasid; Udi Harmoko; Agus Setyawan; Teguh Suroso
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

Anisotropic Pre Stack Depth Migration method has been carried out for 2D seismic reflection data on Line “IR” The simplest form of anisotropic media (VTI (Vertical Transverse Isotropy) was used. Theoretically, this form requires two parameters to describe the media, those are δ (delta) and ε (epsilon). δ is an anisotropy parameter that describe velocity variation near to vertical while ε is an anisotropy parameter that describe velocity variation near to horizontal. The anisotropic Pre Stack Depth Migration produce a section which has corrected build up image and has change to be the true of reflector in 67 m of depth. Base on well and seismic data calculation process, an anisotropic parameter is in the range of 0.050-0.058. Generally, Anisotropy Pre Stack Depth Migration method gave better result than isotropy Pre Stack Depth Migration. Key Word: Anisotropy, Pre Stack Depth Migration, VTI, delta, epsilon
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 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 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 Nurwahyudin, Dindin Syarief Pradipta Ahluriza Ramdani Alfan Subekti Redemtus Heru Tjahjana Rezyta Handani Ririn Sulpiani Rizkan, Muhammad Riznia Aji Salam Rr. Tony Yulianto Saad Abdurrahman Sahid Sahid Satriyo Adhy Sheyza Rery Dynza Anggary Sigit Darmawan Siti Helmyati Siti Zulaikhah Sri Widodo Agung Suedy Sudarno Sudarno Sugeng Widada 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