Articles

AVO FLUID INVERSION (AFI) UNTUK ANALISA KANDUNGAN HIDROKARBON DALAM RESEVOAR Edisar, Muhammad; Malik, Usman
Komunikasi Fisika Indonesia Vol 9, No 5 (2012)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1058.318 KB) | DOI: 10.31258/jkfi.9.5.430-455

Abstract

Selama ini metoda AVO telah banyak digunakan untuk men-determinasi keberadaan hidrokarbon daridata seismik. Namun demikian, pada umumnya hanya memberikan hasil secara kualitatif, tanpa kuantifikasitingkat kepercayaan. Oleh karena itu, diperlukan suatu metoda yang dapat membantu mengatasi masalah ini.AVO Fluid Inversion (AFI) merupakan perluasan dari metoda AVO konvensional. Perluasandilakukan dengan menambahkan simulasi harga Intercept (A) dan Gradient (B) untuk berbagai kemungkinanharga parameter elastik sand dan shale serta kandungan fluidanya. Harga A dan B yang diturunkan dari dataseismik kemudian dapat dikalibrasikan terhadap data sumur dengan menggunakan hasil simulasi tersebut.Sehingga pada akhirnya, dapat diberikan harga probabilitas keberadaan hidrokarbon pada area studi yangkemudian dapat digunakan untuk menggambarkan penyebaran hidrokarbon pada daerah eksplorasi.Pada penelitian ini, metoda AVO Fluid Inversion (AFI) diaplikasikan pada data 3D-seismik di daerahdelta Mahakam. Hasil menunjukkan bahwa determinasi keberadaan gas lebih mudah dilakukan dibandingkandeterminasi keberadaan minyak (oil). Peta probabilitas hidrokarbon menggambarkan keberadaan minyak dangas mengikuti pola-pola channel yang berkembang pada daerah studi.
PEMODELAN SATU SIKLUS RADIASI GELOMBANG TERAHERTZ PADA JARINGAN SAPI DENGAN METODE KOMPUTASI BIOFISIK Mimwindayani, Mimwindayani; Hamdi, Mhd.; Malik, Usman
Komunikasi Fisika Indonesia Vol 14, No 1 (2017)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (562.085 KB) | DOI: 10.31258/jkfi.14.1.1013-1019

Abstract

Terahertz (THz) radiation in the infrared region of electromagnetic spectrumhas a frequencyrange close to water molecular frequency. Interaction of THz radiation indicates a lowscatteringabsorption. This study examines the modeling of one cycle THz wave radiation onbiological tissues such as skin tissue, fat, tumor, and beef by focusing on the physicalparameters of electromagnetic waves Maxwell's Equations. The solution ofthis study usescomputational methods with Wolfram Mathematica 9.0 software to use sources of THz powerdensity (10-150) mW.m-3 and a frequency range (0.1-1) THz. The quality of the absorptionspectrum of THz radiation is limited by the resolution of the resonance frequency varies. Atlower resolutions, the peak of the spectrum is expanded by the energy level can bedetermined with high accuracy. There are differences of peaks between tumor tissue andnormal tissue. This can be seen with the absorption models and experimental results indicatequite accurate with an error of 0.8%.
RESERVOIR STEAM FLOOD MODELING BASED ON 4D SEISMIC AND ROCK PHYSICS Edisar, Muhammad; Malik, Usman
Komunikasi Fisika Indonesia Vol 10, No 7 (2013)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (582.626 KB) | DOI: 10.31258/jkfi.10.7.483-500

Abstract

Reservoir steam flood modeling based on Time Lapse (4D) seismic and Rock Physics data was constructed in Pelangi oil field on central Sumatra Basin. Model used to monitoring and tracking steam flood and production related changes in the reservoir. A model of the reservoir steam flood was constructed for a pattern steam flood in Area X of the field. The model was based on a geostatistical geological model and populated with temperature and porosity. Pressure and saturation properties were added to provide the necessary input for seismic modeling. Through a rock physics model based on the core analysis, the elastic properties (Vp, Vs and density) were determined. These elastic properties were used to determine the seismic response of the model with and without steam flood.The results of the model indicated, that from the rock physics modeling using Gassmann equation, steam flood decreases the Vp by an average of 20-25% in the reservoir sands. Rock physics analysis also shown that shear velocities are also sensitive to steam flood, with an average decrease of 12%. However, the Gassmann calculation results shown that Vs is insensitive to steam flood. This discrepancy is probably caused by Gassmann's assumptions that no chemico-physical interactions exist between the rocks and pore fluids. Time shifts in seismic modeling events provided an indication of the presence of steam flood in the overlying reservoir. The relationship between time shift and steam thickness was strong for thick steam, but it was not possible to distinguish thin steam zones from thick hot oil zones solely on the basis of time shift. At the same time, tuning between the steams related and geologically related seismic events influenced seismic amplitudes. It appears that a combination of attributes is necessary to resolve the effects of steam on the 4D seismic data acquired over of the field.Keywoods : Reservoir, Seismic, Rock
PERBANDINGAN NILAI SUSEPTIBILITAS MAGNETIK AIR LAUT MENGGUNAKAN METODE QUINCKE DI PANTAI SUMATERA BAGIAN TENGAH Rangkuti, Muhammad Zul Ilmi; Salomo, Salomo; Malik, Usman
Komunikasi Fisika Indonesia Vol 17, No 1 (2020)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (275.642 KB) | DOI: 10.31258/jkfi.17.1.41-45

Abstract

Telah dilakukan penelitian perbandingan nilai suseptibilitas magnetik air laut di pantai barat dan timur sumatera bagian tengah menggunakan metode Quincke. Jumlah sampel yang diambil dari penelitian ini sebanyak 500 ml tiap-tiap lokasi. Jumlah titik lokasi sampel adalah 24 didapatkan dari tiga pantai barat sumatera bagian tengah dan satu pantai timur. Metode yang digunakan untuk pengambilan sampel adalah fungsi jarak dengan rentang 300 m dari tepi pantai. Induksi magnetik solenoida diukur menggunakan Probe Magnetic Pasco Ps-2162 dengan dua buah solenoid 3000 lilitan. Ketika arus dinaikkan induksi magnetik semakin besar. Nilai suseptibilitas magnetik ( ? )  air laut pantai barat menunjukkan rentang -1,04 x 10-5 sampai -4,53(x 10-5). Sampel merupakan bahan diamagnetik. Nilai suseptibilitas magnetik ( ? )  air laut pantai timur menunjukkan rentang -0,5 x 10-5 sampai -1,46(x 10-5).sampel merupakan bahan diamagnetik. Salinitas dan pH menyebabkan perbedaan nilai suseptibilitas magnetik air laut.
PENYEDIAAN AIR TAWAR DARI PENYULINGAN ENERGI SURYA MENGGUNAKAN TEKNIK REFLEKTOR CERMIN CEKUNG Edisar, Muhammad; Malik, Usman
Komunikasi Fisika Indonesia Vol 12, No 10 (2015)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.12.10.651-657

Abstract

A research has been conducted to produce clean water using solar energy withconcave mirror reflector as the heater. The reflector made by 2.2 meters ofdiameter, 0.3 meters of height and 1 meter focus of the reflector. The reflectormade can be illuminated by the sunlight directly. The media of container filledwater samples to destilate that placed on focus of the reflektor. The temperature ofwater sample heated measured every one hour with time of observation from08.00 to 16.00 WIB. The observation was done if weather is good for seven days.The results of the research show that the maximum temperature of water sampleheated 100o C using the reflector. The maximum temperature of water samplewithout reflector 64oC. T he r esulut o f water volume destilated very good. Thelaboratory test of the water samples before and after distillated show that waterquality treatment increase significantly.Keywords: solar energy, clean water, distillation, concave mirror reflector
PENENTUAN SIFAT MAGNETIK PASIR DAN DEBU SEPANJANG JALAN KARTAMA KOTA PEKANBARU MENGGUNAKAN MAGNETIC PROBE PASCO PS-2162 Nainggolan, Maria Sonya Nauli; Erwin, Erwin; Yanuar, Yanuar; Malik, Usman
Komunikasi Fisika Indonesia Vol 16, No 1 (2019)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.16.1.12-19

Abstract

Topsoil is the recipient of various kinds pollutants, especially heavy metals. Heavy metals have been detected in sand and dust along the highway. Measuring the magnetic properties of road sediment along Kartama road in Pekanbaru City has been done. The magnetic properties measured are magnetic degree, magnetic and mass susceptibility using magnetic induction measurement.  The Samples were taken at sixteen locations with the amount of 1 or 2 kg for each point location, the samples were named as samples 16, 7a7e, 8a8e. The magnetic particles of the samples were separated from sand and dust using Iron Sand Separator and later using Neodymium Iron Boron (NdFeB) magnet. The total magnetic induction of the samples and concentrates were measured using Pasco Magnetic Probe PS-2162. In order to measure the magnetic induction of the samples, a solenoid of 3 cm in diameter, length of 10 cm and 2000 of windings was made. The empty solenoid magnetic induction was measured as a function of applied current ranging from 210 A and as a function of horizontal distance of 15 mm from the the solenoid ends. Total magnetic induction (samples and concentrates) was measured for the applied currents of 6 A. The results showed that the highest magnetic degree obtained from the sample number 7e that is 2.54% and the lowest level obtained from the sample number 3 that is 0.17%. The highest magnetic susceptibility value obtained from the sample number 7b was is 9158.12 , and the lowest magnetic susceptibility value obtained from the sample number 2 with the value of 3125.52 . Based on the mass susceptibility values of the concentrate obtained that the sand and dust along the road Kartama Pekanbaru which are in the interval 4.6 to 8.0, they implies that the mass susceptibility of the samples is in the range of Ilmenite phase FeTiO3or antiferromagnetic. 
ANALISIS EFEK GERHANA MATAHARI TOTAL 9 MARET 2016 TERHADAP KANDUNGAN TOTAL ELEKTRON IONOSFER Ariani, Afrita; Malik, Usman; Husin, Asnawi
Komunikasi Fisika Indonesia Vol 17, No 1 (2020)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.17.1.50-54

Abstract

Total elektron contant in ionosphere is affected by several fastors, local time, solar aktivities, geomagnetic disturbance, geographical latitude and longitude. This researh aims to observase level variation of total electron contant during solar eclipse over Indonesia on 9 March 2016. We analyzed GPS data from two GPS stations in different locations with different sun observation geographical latitude and longitude, the locations were Sulawesi station (CAMP) and Maluku station (CAMB). The method used in this research, was data interpretation method  computationally, the whole data analyzed using matlab software R2008a. The values of daily TEC range from 20 TECU till 30 TECU. Although the value of TEC when solar total eclipse range from 10n TECU untill 20 TECU. The percentage of decreasing value of TEC when total solar eclipse than the daily value of TEC. Decreasing of TEC value between 20%-40%.
PENGARUH KONSENTRASI KOH TERHADAP SIFAT FISIS DAN ELEKTROKIMIA ELEKTRODA KARBON DARI LIMBAH KULIT DURIAN SEBAGAI SEL SUPERKAPASITOR Kurniawan, Pandi; Taer, Erman; Malik, Usman; Taslim, Rika
Komunikasi Fisika Indonesia Vol 15, No 1 (2018)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.15.1.62-66

Abstract

Activated carbon electrode have been prepare from durian shell focused in KOH concentration variations at chemical activation process. The preparation of carbon electrodes begins with pre-carbonization process, grinding using Hard Grinder and ball milling, after that followed by sieving process with particle size at range of 39 - 52 ?m. Chemical activation was performed by using KOH activator agent with concentration variation of 0.5 M, 0.6 M, 0.7 M. Carbon powder are formed to pellet form using Hydraulic Press at a 8 ton compression pressure. The carbonization process is carried out a temperature of 600°C in the N2 gas atmosphere at a temperature of 900°C for 2 hours. The electrodes characterization are performed to determine the physical and electrochemical properties.The physical properties such as density, degree of cristanility, surface morfology was analyzed by calculate the electrode dimension such as, mass, thickness and diameter, X-ray diffraction analysis and Scanning Electron Microscopy Analysis. the electrochemical properties was studied the cell capacitance and the electrode capacitance specific using Cyclic Voltammetry method. the electrode density were decrease with the increasing the KOH concentration. The smallest density has been found at electrode using a KOH concentration of 0.7 M. The XRD test showed a carbon was amorfphuse structure identified by existing two broadening peaks at an angle of 2?, ie 24.967°, 44.315° and 81.332° which describes the  (002), (100) and (112) planes. Furthermore, samples were analyzed by Scanning Electron Microscopy and X-ray diffraction. The  cyclic voltammetry result, obtained the highest specific capacitance of 89.05 F/g and cell capacitance 24,04 F was found at electrode with a KOH  concentration of 0.7 M. From this research it can be concluded that the KOH optimum concentration was 0.7 M.
INTERPRETASI TRANSMISIVITAS UNTUK ANALISA POTENSI AIR BAWAH TANAH BERDASARKAN DRAWDOWN AIR SUMUR CINCIN MENGGUNAKAN METODE PUMPING TEST DI KECAMATAN MARPOYAN DAMAI KOTA PEKANBARU Pritamara, Rigia Givanny; M, Juandi; Malik, Usman
Komunikasi Fisika Indonesia Vol 16, No 1 (2019)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.16.1.35-39

Abstract

The most consumption water is groundwater taken through excavated wells or ring wells. An aquifer test can be applied in  pump test in order to find transmissivity of drawdown ring wells.The tested ring wells were located at 25 different locations in the Marpoyan Damai District. In the pumping test on the ring wells data was obtained namely drawdown test data s, times t, rate of discharge Q, and then create a graph of s/Q vs Q. The straight line that cut the s/Q axis the A value with the C gradient and the determinant coefficient d2. The values obtained were then inserted into the transmisivity formula of the Cooper-Jacob method. The A values for t = 3 minutes and t = 7 minutes were selected because their results in C values are close to each other. The C values of t = 3 minutes and t = 7 minutes are 0.1671 and 0.1672 respectively. Transmissivity value obtained is 134.5 m2/day. The value shows a potentially useful groundwater aquifer for the Marpoyan Damai district because the transmissivity value exceeded 50 m2 / day.
KARAKTERISASI DIFFRAKSI SINAR-X (XRD) MATERIAL FERROELEKTRIK BARIUM TITANAT (BATIO3) Dewi, Rahmi; ', Krisman; Malik, Usman; ', Fauzan
Komunikasi Fisika Indonesia Vol 10, No 7 (2013)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.10.7.513-515

Abstract

Ferroelectric material Barium Titanat (BaTiO3) has been made with the comparison of 1:1from chemical reactionof Barium Carbonat (BaCO3) and Oxide Titanium (TiO2). The sample at pra-sinter at temperature of 400oC and printed in the form of pellets.The pellet were anneled with the temperature of 700oCand then characterized using XRD. The results of characterization using XRD was described on a graph between the intensity versus 2 theta angle. TheXRDresultsBaTiO3 before annelingdoes not show any peaks, this mean that the structure of BaTiO3before annelingis amorfus structure. The XRDresult BaTiO3 after annelingshowedsome peaks, the positions of the peaks on 2? are 23.32°, 32.72°, 38.40o, 45.52o, 52.04°, 57.80o. After anneling, the peaks become wider, this mean the samples become crystaline in structure. At standard temperature (0oC to 320oC) the samples of BaTiO3 has tetragonal formbut on the temperature 700oC after being anneledit changed into Cubic.Keywords:CharacterizationXRD; BaTiO3; AnellingTemperature