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Jurnal Geofisika

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Published by Himpunan Ahli Geofisika Indonesia

ISSN : 0854352 EISSN : 24776084 DOI : https://doi.org/10.36435/jgf

Core Subject : Science,

Earth & Planetary Sciences Energy Physics

Jurnal Geofisika [e-ISSN : 2477-6084] is a scientific journal published by Himpunan Ahli Geofisika Indonesia (HAGI). This journal is referenced, each paper was assessed and evaluated by editors and reviewers who are experts in the relevant fields and come from education institutions and industry, both from within and outside the country. The published article covers all science and technology including Geophysics, Meteorology, Oceanography, Geology and Geodesy.

Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geofisika

Articles 100 Documents

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Elastic Properties Modeling for Identification of Prospective Reservoir Zones in the Carbonate Reservoir, MRD Field in the North East Java Basin Mordekhai Mordekhai; Sonny Winardhi
Jurnal Geofisika Vol 17 No 1 (2019): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

“MRD” field is an oil and gas field which located in Rembang Zone. One of the hydrocarbon zones in this fieldlies in Ngimbang Formation. Reservoir in this field has a lifespan of Middle Eocene to Early Oligocene. Reservoir of this formation is carbonate rocks and dominated by calcite and dolomite minerals. One of the uniqueness of this kind of reservoir is the pore shape which quite complex. In this study, reservoir characterization which performed on this field is based on elastic properties modelling. Elastic Properties modelling which was conducted in this field can provide an output of the pore shape, aspect ratio, and the fraction of each respective poresforms that exist in this field’s reservoir zone. Therefore the primary data such as petrophysical data, XRD (X-Ray Diffraction), and the data of other reservoir parameters are needed for more accurate resultsobtained with real conditions. The result of this modelling shows that the shape of the pores in the reservoir zone at any depth can be predicted. Distribution of pore shapes that exist in the two wells can be used as a reference for prospective determination of hydrocarbon zones in “MRD” field.

Identifikasi Hidrokarbon Gas Dengan Menggunakan Atribut Energy-weighted AVO pada Lapangan Penobscot, Kanada Ashari Aries; Wahyu Triyoso
Jurnal Geofisika Vol 15 No 2 (2017): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v15i2.407

Amplitude Variation with Offset (AVO) adalah teknik yang sering digunakan sebagai indikator keberadaan hidrokarbon pada data seismik. Teknik ini secara matematis menggunakan pendekatan terhadap persamaan Zoeppritz untuk mengidentifikasi perubahan amplitudo sebagai fungsi dari sudut datang dan menghubungkannya dengan sifat batuan dan kandungan fluida yang ada di dalamnya. Pada penelitian ini, atribut baru, Energy-weighted AVO, digunakan untuk mengidentifikasi keberadaan hidrokarbon pada lapangan Penobscot, Kanada. Prinsip utama atribut ini adalah meningkatkan respon anomali yang berkaitan dengan hidrokarbon sekaligus mengatenuasi seismik background di sekitar anomali. Keunggulan atribut ini adalah mampu membedakan respon anomali hidrokarbon terhadap anomali lain yang disebabkan oleh litologi seperti batubara. Selain itu, atribut ini aplikatif terhadap data seismik pre-stack maupun post-stack.

Hypocenter relocations and tsunami simulation for the 15 November 2014 Northern Molucca Sea earthquake in Indonesia Aditya Riadi Gusman; Andri D. Nugraha; Hasbi Ash Shiddiqi
Jurnal Geofisika Vol 15 No 3 (2017): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

A reverse fault earthquake (Mw 7.1) occurred in the Northern Molucca Sea, Indonesia, on 15 November 2014 at 2:31:40 UTC. The earthquake produced small tsunami waves that are recorded at Jailolo (9 cm), Tobelo (1 cm), and Menado (3 cm) tide gauges. The Indonesian Agency for Climatology, Meteorology, and Geophysics (BMKG) issued a timely (5 minutes after the earthquake) tsunami warning for the event. We used the teleseismic double‐difference seismic tomography method (teletomoDD) to relocate the hypocenters of the mainshock and the aftershocks. The relocated hypocenter of the mainshock for the 2014 Northern Molucca Sea earthquake is located at 1.923°N, 126.539°E, and depth of 48.87 km. In general, the relocated aftershock hypocenters are shallower than those from the BMKG catalog. The relocated hypocenters are distributed within a depth range of 6 to 64 km. The aftershock area from the relocated hypocenters is 80 km long and 55 km wide. The estimated seismic moment from the Global CMT solution (GCMT) was 4.75 × 1019 Nm. We simulated the tsunami from fault model of each GCMT nodal plane to find a fault model that can best explain the observed tsunami heights at Jailolo, Tobelo, and Menado tide gauges. The best single fault model for this event is dipping to the west, has fault length, width, and slip amount of 47 km, 25 km, and 1.16 m, respectively. The K value calculated using the observed and simulated tsunami heights for this best model is 1.026, suggests a very good fit to tsunami observations.

Identification of Leaching Zone in Pasirimpun Dump Station, West Java, Indonesia Using Resistivity and Induced Polarization Method Alfin Ari Nugraha; A.` A. Ilmanto; J. Jonathan; R. M. Rashad; S. Maghrifa
Jurnal Geofisika Vol 16 No 3 (2018): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

The presence of dump stations around resident's houses besides resulting air pollution, it is also affectingthe cleanliness of water used by society to meet their daily needs. Location where we researched is at ex-Pasirimpun Dump Station, Karang Pamulang Village, Kecamatan Cicadas, Bandung. Although Pasirimpun Dump Station has been closed and turned function into Taman Abdi Negara, it is feared that there is a water pollution caused by leach zone. Geophysical measurements by geoelectric method are performed to prove the leaching zone. This study aims to determine the depth of the leaching zone, its position against the groundwater level, and what potential harm can caused by the leaching zone. The methodology that is used are direct observation, interviews, and literature studies. Our measurements is done by using schlumberger conguration and Induced Polarization (IP) method on morphology that tend to be at with a length of 141 meters stretch and a spaceof 3 meters. Groundwater faces are mapped to be correlated with the depth of the existing leaching zone. From the results of literature studies, there is a leaching zone in the area with a depth of about 30 meters. By knowing this leaching zone, we hope that there will be cooperation between government and society to avoidthe impacts of leaching zone on the water which they consumed. One way to know, is to drill deeper water level from the leach zone.

Experimental Study of Spectral Induced Polarization Response Based on Laboratory Measurement Dicky Ahmad Zaky; Suparwoto Suparwoto
Jurnal Geofisika Vol 16 No 2 (2018): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v16i2.374

The spectral induced polarization (SIP) method can provide apparent complex resistivity based on measurements of multi frequency. SIP method also can provide more detail information about physical properties of rocks and minerals because SIP can give spectral parameters or Cole-Cole parameters such as, changeability (m), time constant (τ) and frequency dependence (c). An Experimental study in laboratory has been conducted to knowing the SIP response of some test sample. The measurement system is built with digital oscilloscope Pico ADC-100 as device for sampling the input and output voltage. Amplifier is used to doubled up the signal and input differential. The range frequency of measurement is 10−2 Hz - 103 Hz. Porouspot Cu − CuSO4 is used to minimize the polarization at potential electrode. A Matlab listings is used to calculate the response of impedance and phase. The result from calibration that used the parallel circuit RC indicate that the measurement system was good. SIP response of porous model indicate that the response form an asymptotic resistivity, and the peak of phase is in the range frequency where the dispersion happen. The result also indicate that resistivity of small grain size model is larger than the big grain size model. Result from sample of mineralized rocks did not indicate a perfect SIP response, it is influenced by the contact between mineral and water was minimum.

Analisis Eliminasi Multiple Menggunakan Metode F-K Filter dan Transformasi Radon Parabola Khayrunnisa Agustina; Wahyu Triyoso
Jurnal Geofisika Vol 15 No 1 (2017): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v15i1.399

Penjalaran gelombang seismik di dalam bumi terpengaruh oleh banyak faktor atau noise yang menyebabkan distorsi, salah satunya adalah gelombang multiple. Gelombang multiple pada beberapa kasus mengganggu citra dari penampang seismik sehingga dapat menyebabkan kesalahan pada saat interpretasi data. F-K Filter dan Transformasi Radon Parabola merupakan metode yang dapat digunakan untuk mengeliminasi multiple yang memanfaatkan perbedaan moveout antara event primer dan multiple dengan mengubah data dari domain t-x ke domain lain setelah sebelumnya dilakukan koreksi NMO. Metode F-K Filter dan Transformasi Radon Parabola diaplikasikan pada data sintetik seismik 2D untuk melihat kelebihan dan kekurangan kedua metode tersebut dalam mengeliminasi multiple dan melihat efek padatrendnilai amplitudo sebelum dan sesudah dilakukan proses eliminasi. Hasil menunjukkan bahwa Transformasi Radon Parabola lebih baik daripada F-K Filter dalam mengeliminasi multiple karena F-K Filter masih menyisakan multiple yang cukup kuat terutama pada near oﬀset.

Estimation of Rock Physical Parameters Based on Digital Rock Physics Image, Case Study: Blok Cepu Oil Field, Central Java, Indonesia Handoyo Handoyo; Fatkhan Fatkhan; Fourier D. E. Latief; Harnanti Y. Putri
Jurnal Geofisika Vol 16 No 1 (2018): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Modern technique to estimate of the physical properties of rocks can be done by means of digital imagingand numerical simulation, an approach known as digital rock physics (DRP: Digital Rock Physics). Digital rockphysics modeling is useful to understand microstructural parameters of rocks (pores and rock matrks), quite quickly and in detail. In this paper a study was conducted on sandstone reservoir samples in a rock formation. The core of sandstone samples were calculated porosity, permeability, and elasticity parameters in the laboratory. Then performed digital image processing using CT-Scan that utilizes X-ray tomography. The result of digital image is processed and done by calculation of digital simulation to calculate porosity, permeability, and elastic parameter of sandstones. In addition, there are also predictions of p-wave velocity and wave -S using the empirical equations given by Han (1986), Raymer (1990), and Nur (1998). The results of digital simulation (DRP) in this study provide a higher than the calculations in the laboratory. The digital rock physicsmethod (DRP) combined with rock physics modeling can be a practical and rapid method for determining the rock properties of tiny (microscopic) rock fragments

Implementation of Filter Picker Algorithm For Aftershock Identification of Lombok Earthquake 2018 A. Ardianto; Y.M. Husni; A. D. Nugraha; M. Muzli; Z. Zulfakriza; H. Afif; David P. Sahara; Sri Widiyantoro; Awali Priyono; Nanang T. Puspito; Pepen Supendi; A. Riyanto; Shengji Wei; B. S. Prabowo
Jurnal Geofisika Vol 17 No 1 (2019): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

The ability to identify earthquake events that are consistent, efficient and accurate is increasingly needed along with the increase in the amount of data analyzed. In this paper a filter picker algorithm is implemented to identify aftershock events and determination of arrival time automatically, especially for the P wave phase. Here modifications are made in determining the uncertainty of arrival time and there are additional criteria in determining the time of arrival used. The additional criteria are that in a certain time span, there are at least 5 stations determined by the time the filter picker arrives. This is done to minimize identification errors due to local noise and other practical reasons, namely the minimum number of stations to determine the location and other seismological analysis. To test the filter picker algorithm, aftershock data from the Lombok earthquake occurred on July 29 (M 6.4), August 5 (M 7), and August 19 (M 6.3 and M 6.9) 2018. The aftershock data were used for 30 days, from August 4, 2018 to September 4, 2018 using local seismic station in Lombok Island. The results of the filter picker algorithm were evaluated by comparing the number of earthquake events detected and the accuracy of determining the P wave arrival time automatically to the results of manually arriving time. In addition, a comparison of the results obtained from a broadband type seismometer with a short period is used to find out how much influence the type of tool has on its performance results. The results of the comparison with the manual arrival time show that more than 85 percent of the results of the automatic arrival time have a difference below 0.2 seconds. Therefore, it can be said that the filter picker algorithm is quite effective for identifying events and determining the arrival time of P waves. In this paper it is also shown that this algorithm can be used for broad band and short period seismometer sensor, even without the prior correction of instruments.

Peningkatan Akurasi Lokasi Gempa Mikro Dengan Menggunakan Metoda Double-Difference Dan Korelasi Silang Master Waveform Arifa Hijriani; David P. Sahara; Andri D. Nugraha; Irvan Ramadhan; R. P. Sidik
Jurnal Geofisika Vol 15 No 3 (2017): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Perekaman gempa mikro menjadi suatu metode yang umum dilakukan untuk memperkirakan struktur geologi pada suatu lapangan panas bumi. Data hasil perekaman gempa mikro di Lapangan Panas Bumi ARD, sebelum proses pemboran eksplorasi, diolah dan dianalisis dalam penelitian ini dengan tujuan untuk memetakan struktur bawah permukaan. Jaringan seismik pada Lapangan Panas Bumi ARD terdiri dari 26 stasiun yang dipasang selama 8 bulan sejak Agustus 2011 dalam radius 20 km dari target reservoir. Terdapat 637 gempa mikro lokal yang berhasil terdeteksi dan terpetakan selama pengukuran berlangsung. Jumlah ini relatif besar untuk sebuah daerah yang masih dalam tahap awal eksplorasi panas bumi. Akan tetapi, akurasi penentuan lokasi hiposenter gempa mikro perlu ditingkatkan mengingat keberadaan kesalahan penentuan waktu tiba dan model kecepatan. Studi ini bertujuan untuk meminimalkan kesalahan akibat dua parameter tersebut dengan menggunakan metode korelasi silang dan double dierence. Korelasi silang waveform dengan master event diterapkan untuk meningkatkan kualitas penentuan waktu tiba. Terdapat 559 dan 527 pasangan waveform yang memiliki korelasi diatas 0.76. Gempa-gempa mikro yang muncul diinterpretasikan berasal dari bidang patahan yang sama. Koreksi waktu tiba rata-rata yang dihasilkan adalah sebesar 0.2 detik. Setelah dilakukan relokasi dengan metode double dierence, lokasi gempa bergeser sekitar 200 hingga 1500 m dan dihasilkan cluster gempa mikro yang lebih tajam. Kluster gempa mikro tersebut bersesuaian dengan struktur berarah Timur laut - Barat daya di lapangan ARD. Residual travel time gempa mikro juga menunjukkan penurunan yang signikan. Dari hasil penelitian dapat disimpulkan bahwa relokasi hiposenter dengan metode korelasi silang master event dan double difference berhasil mereduksi ketidakpastian lokasi hiposenter di lapangan ARD.

3-D Inversion of Gravity Data Using Iterative Calculation for Subsurface Modeling of Mt. Pandan, East Java, Indonesia Waskito Aji; E. J. Wahyudi; D. Santoso; W. G.A. Kadir
Jurnal Geofisika Vol 16 No 3 (2018): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Mount Pandan is one of the volcanoes located in East Java.There was an earthquake with magnitude 4.2 onThursday, June 25, 2015, at 10.35 pm located in the area of Mount Pandan. The earthquake indicates the active tectonic of Mount Pandan. In addition, Mount Pandan is one of eleven geothermal prospects in East Java. Thus, it is interesting to do a study related to the geological condition of Mount Pandan. So far, most studies have discussed the related surface geology of Mount Pandan. This study aims to provide information related to the subsurface condition of Mount Pandan based on gravity data. In this research, gravity data inversion modeling technique is used to image the subsurface condition of Mount Pandan. The inversion technique used is non linear inversion with iterative calculation method. In this modeling scheme, the model to be determinedis a layer boundary depth model of two layers of rock based on gravity anomaly data. In each layer the rock is assumed to be composed of a set of rectangular prisms with a certain dimension. A collection of prisms representing the rock layers is then computed by the model response and evaluated by comparing it to the observed data. From this evaluation, a modication of the length of the prism is made so thatthe boundary layer model will change. The process of evalu ation and modication of the model is done iteratively until it reaches the number of predened iterations. The result obtained from this gravity inversion modeling is a model of the subsurface boundary of Mount Pandan. The subsurface model obtained is the existence of a formation resembling a rock intrusion, in this case interpreted as an andesitic rockthat intrudes overlying rock layers. This intrusive formation lies at the peak of Mount Pandan and is continuously to the north, with the undisturbed intrusion located around the summit of Mount Pandan.

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Editorial Address Patra Jasa Tower, 18th Floor (Suite 1820), Jl. Gatot Subroto Kav. 32-34, Kuningan Jakarta Selatan

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Contact Name
Zulfakriza

Contact Email
zulfakriza@gmail.com

Phone
+6281360729183

Journal Mail Official
secretariat@hagi.or.id

Editorial Address
Patra Jasa Tower, 18th Floor (Suite 1820), Jl. Gatot Subroto Kav. 32-34, Kuningan Jakarta Selatan

Location
Kota adm. jakarta selatan,

Dki jakarta

INDONESIA