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Muhammad Irham Nurwidiyanto
Departemen Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro, Semarang
Physics

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PEMODELAN STRUKTUR PADA LAPANGAN WAHRE, CEKUNGAN MADURA, JAWA TIMUR UNTUK PERHITUNGAN CADANGAN AWAL GAS (GAS INITIAL IN PLACE) Restuwaty Indra Wahyuni; Muhammad Irham Nurwidiyanto
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

Seismic interpretation has been done in Wahre field, Madura Basin, East Java with the main target of the research is Mundu Formation, which is the existence of gas. The research aim to modeling the depth structure to estimate the initial gas reserves. Modeling of the structure obtained from the results of time domain conversion (TWT) to the depth domain (Feet). Depth modeling was obtained from the results of linier regression of uncertainity graph two well log that have different depth. The depth structure shows the location of Mundu Formation are crossways from the west sea to the southeast as the background of the geological of Madura Basin. The linier regression uncertainity result represent the value of GRV (gross rock volume) which is divided into three case. The first value is high case, the high case is 65.505.181 m3. Mid case or medium case is 65.446.249 m3. And psimis case is 58.060.543 m. The three GRV value will be used to calculate the approximate initial gas in place (GIIP). GIIP results was 64.7 BCF to high case. The medium case was 64,6 BCF. And for the psimis case was 57,3 BCF.
Identifikasi geological strike dan dimensionalitas berdasarkan analisis phase tensor untuk pemodelan 2D magnetotelurik di lapangan panas bumi “GYF” Ganap Y. Febrika; Agus Setyawan; Muhammad Irham Nurwidiyanto; Imam B. Raharjo
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

Magnetotellurics method is frequently used in exploration of geothermal resources for determining the subsurface resistivity distribution of the Earth. An accurate representation of the Earth’s resistivity structure can be obtained by knowing the direction of geoelectrical strike and dimensionality structure prior to modelling. Besides those both cases, distortion in the data magnetotelluric can lead to errors of interpretation. Therefore, this study was conducted to identify the geoelectrical strike direction and dimensionality structure in the “GYF” geothermal field using phase tensor analysis prior to 2D modelling. Three invariant parameters of phase tensor i.e ellipticity, phase tensor skew angle (β) and Azimuth of phase tensor maximum (α-β) are used to get the information about the dimensionality and geoelectrical strike direction on 65 magnetotelluric data in “GYF” geothermal field. Results of the phase tensor analysis show that the direction of geoelectrical strike is N60°W or 300° at frequency (10-0,2 Hz) and dimensionality of subsurface structure consists of a structure 1D, 2D and 3D. Structure of 1D and 2D is in the frequency range 320 to 0,2 Hz, while the 3D structure is at a low frequency, ie f < 0,2 Hz. Identification of geoelectrical strike and dimensionality in 2D magnetotelluric modelling can minimize misinterpretation.Keywords: Dimensionality, geoelectrical strike, distortion, phase tensor
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
Pemodelan bawah permukaan zona subduksi Daerah Selatan Jawa Barat berdasarkan data anomali medan gravitasi Muhammad Isom Ashar; Muhammad Irham Nurwidiyanto; Hernowo Danusaputro
Youngster Physics Journal Vol 6, No 4 (2017): Youngster Physics Journal Oktober 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The southern part of western Java is a subduction path between the Indo- Australian plate and Eurasian plate which still active. Subduction paths can also be identified by geophysical methods. One of geophysics method that can be used is the gravity method. The gravity method can describe the form of subsurface rocks based on the variations of the earth's gravitational field which generated by differences in density (mass density) between rocks. This research was conducted to know the condition of subsurface by doing 2D modeling. Anomaly data obtained from bgi.omp.obs. At the regional anomaly, 2D modeling was performed showing the rock density and there is subduction in the south of West Java. The rock ocean plate has a density of 3.14 g/cm 3. Continental plate has a density of 2.51 g/cm 3,the rock which has been deformed has a density of 2.29 g/cm 3, sedimentary rock has density 2.11 g / cm 3 and bedrocks have density 2.36 g/cm 3. From the subduction model can be sloped between 11o to 13oKeywords: Subduction, West Java, Gravity method, Density
INTERPRETASI STRUKTUR BAWAH PERMUKAAN MENGGUNAKAN METODE MAGNETIK (DAERAH SEKITAR SUNGAI OYO YOGYAKARTA) Dewi Saroh Muzhaffar; Muhammad Irham Nurwidiyanto
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

Magnetic survey has been carried out in the area of Central Java DI Yogyakarta, arround Oyo River, aims to interpret the subsurface structure of the fault zones surrounding Patuk, Dlingo and Playen district. In this study, magnetic data acquisition was carried out in 70 points by using a PPM (Proton Precession Magnetometer) geometrics 856X models to get the values of the total magnetic field. Data Processing began with International Geomagnetic Reference Field (IGRF) to get the total magnetic anomaly. The total magnetic anomaly contour created by using Surfer that has been used to process upward continuation and then made reduction to the poles. The result of research showed the magnetic anomaly closure pair of positive and negative indicated a fault zone below the surface. The closure pair of positve and negative close to Oyo River was made an incision to determine the subsurface structure of the region by creating a model of 2-dimensional (2D) and a model of 3-dimensional (3D). In 2D modelling result show that there was a fault zone at 650 meters depth at the x coordinate 444942(UTM). It is characterised by changes on the contrast susceptibility values 0.3241 and 0.3225 on the third layers. The interpretation was reinforced by the result of 3D modelling in the area. The fault suspected to be around arround Oyo River, Gunung Kidul with north-south direction.
Co-Authors Agus Setyawan Dewi Saroh Muzhaffar Ganap Y. Febrika Hernowo Danusaputro Imam B. Raharjo Muhammad Isom Ashar Nanang Didik Susilo Restuwaty Indra Wahyuni Udi Harmoko