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Jurnal Geofisika Eksplorasi
Published by Universitas Lampung
ISSN : 23561599     EISSN : -     DOI : -
Core Subject : Science,
Jurnal Geofisika Eksplorasi adalah jurnal yang diterbitkan oleh Jurusan Teknik Geofisika Fakultas Teknik Universitas Lampung. Jurnal ini diperuntukkan sebagai sarana untuk publikasi hasil penelitian, artikel review dari peneliti-peneliti di bidang Geofisika secara luas mulai dari topik-topik teoritik dan fundamental sampai dengan topik-topik terapandi berbagai bidang. Jurnal ini terbit tiga kali dalam setahun (Maret, Juli dan November), Volume pertama terbit pada tahun 2013 dengan nama Jurnal Geofisika Eksplorasi (JGE).
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Articles 5 Documents
Search results for , issue " Vol 2, No 01 (2014)" : 5 Documents clear
PENENTUAN KELAS ANOMALI AVO PADA RESERVOAR BATUPASIR LAPANGAN ILM FORMASI GUMAI-D SUB CEKUNGAN JAMBI Yuliansyah, Zaivan
Jurnal Geofisika Eksplorasi Vol 2, No 01 (2014)
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Abstract

AVO analysis methods have been widely done by researchers to be able to determine the class of gas reservoir anomaly. Pick AVO application and crossplot analysis between AVO Attribute, there are Intercept and Gradient can prove to determination of anomaly gas sandstone class at ILM Field Gumai-D Formation Jambi Sub-Basin. Class I gas sandstone anomaly in Vanda-1 and Vanda-3 wells area, and Class III gas sandstone anomaly in Vanda-2 well area. Keywords: AVO, Intercept, Gradient.
KARAKTERISASI RESERVOAR HIDROKARBON PADA LAPANGAN “TAB” DENGAN MENGGUNAKAN PEMODELAN INVERSI IMPEDANSI AKUSTIK Simanjuntak, Adi Sutanto
Jurnal Geofisika Eksplorasi Vol 2, No 01 (2014)
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Abstract

Research has been performed with the characterization of hydrocarbon reservoir in “TAB” field using acoustic impedance inversion modeling. Acoustic impedance (AI) is a rocks ability to parse seismic waves that is the product results from rock density and velocity. Acoustic impedance also influenced by the type of litology, pressure, temperature, porosity and fluid content. This research used AI inversion method because a result of this inversion can give a imaging of the actual subsurface conditions, so that it can mapping the distribution of porosity reservoir target. The purpose of this research is determine value of acoustic impedance inversion results in the reservoir, estimate value of porosity a rocks in the reservoir and mapping the pattern of spread reservoir through analysis of acoustic impedance and porosity values. with comparing the results of inversion from some inversion modeling such as Bandlimited, Model Based and Linear Programming Sparse-Spike, so used is linear programming sparse spike model. The result of linear programming sparse spike model showing good correlation is 0.927 and the small error is 0.440 and does not depend on initial model, so it is good to used for targets that have a high reflectivity value. The results of inversion showing acoustic impedance located in low impedance zone between 2000 m/s*gr/cc - 3458 m/s*g/cc with depth around 1500 to 1700 ms. From this results has been slicing of the data. This slicing data is done with a window on 10 ms under the horizon, 20 ms under the horizon, and 30 ms under the horizon. Distribution of porosity inversion results is done by using 7 attribute. The results of porosity distribution obtained an average of 30%. Slicing porosity that shows the acoustic impedance values located in low anomaly which have a high porosity.Keyword: Acoustic Impedance (AI), Linear Programming Sparse Spike (LPSS), porosity
STUDI IDENTIFIKASI STRUKTUR BAWAH PERMUKAAN DAN KEBERADAAN HIDROKARBON BERDASARKAN DATA ANOMALI GAYA BERAT PADA DAERAH CEKUNGAN KALIMANTAN TENGAH Erviantari, Dian
Jurnal Geofisika Eksplorasi Vol 2, No 01 (2014)
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Abstract

In this study, it has been to identified the structural and hidrocarbon prospect on Central Kalimantan Basin using gravity method. Fault Structure in this Field  has been identified using second vertical derivative and 3D inversion modelling Bouguer Anomaly. Bouguer anomaly in this field has a high anomaly in the center while the low anomaly in the north and south area. From second vertical derivative anomaly map indicated presence normal fault on NE-SW direction. Hidrocarbon prospect in this area are corelate with high residual anomaly.Keywords       : Bouguer Anomaly, Fault, Second Vertical Derivative, Structure
AMPLIFIKASI GEMPABUMI DAERAH SUBANG JAWA BARAT Setiani, Nani
Jurnal Geofisika Eksplorasi Vol 2, No 01 (2014)
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Abstract

Geological and topographical conditions of Subang Regency complex causes of this area has huge potential earthquake. With microzonation method, the base layer frequency and waveamplitude of the can be known. The amplitude of the wave is the value of amplification. Amplification or strengthening of earthquake waves can occur because of differences indensity and velocity in sedimentary rocks which is above the basement. Amplification in Subang Regency has levels 1 to 5 times. Amplification value was highest in low plain areaswith soil-forming rock types of sedimentary rocks form coastal sediment, floodplains sediment(QAC), and plan with tuff rock types of sand, lava, pumice tuff rock (Qyt) and unrefined sediment. The amplification value is also influenced by the thickness of the sediment layer, and the elevation and slope.Keywords : microzonation, amplification.
PENENTUAN ZONA RAWAN GUNCANGAN BENCANA GEMPA BUMI BERDASARKAN ANALISIS NILAI AMPLIFIKASI HVSR MIKROTREMOR DAN ANALISIS PERIODE DOMINAN DAERAH LIWA DAN SEKITARNYA Arifin, Satria Subkhi
Jurnal Geofisika Eksplorasi Vol 2, No 01 (2014)
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Abstract

Microtremor is a natural harmonic ground vibration that occurs continuously with low amplitude about 0.1 to 1 micron  by subsurface movements. Microtremor characteristics reflect the characteristics and types of rocks based on the value of the dominant period and useful for analyzing of rocks response in strengthening (amplification ) waves vibration based on the impedance difference between basement and sedimentary rocks above it.Based on seismicity  historical, Liwa had been hit greatly by an earthquake twice on June 24th, 1933 with  magnitude  7.3 skalarichter  and 7.0 skalarichter on February 15th, 1994, and the degree of damage and the number of victims increases . It underlies the research of microtremor in Liwa on April 15, 2013 to May 4, 2013 that limits in providing information that used for the planology development to decrease the earthquake impact.The Data result of mickrotremor research were the value of the horizontal to vertical spectral ratio (H/V), the dominant frequency and dominant period. From the analyzing that had been done, it determined that the research area was in area within the value of amplification factor (amplification) was more than  5 and the value of the dominant period was more than 0.5 seconds. Lithology of research area was on alluvial rocks. The interaction of faults made it deformated well and cause the research area was very vulnerable when hit by earthquakes.Keywords: Microtremor, microzonation, amplification

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