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Sandri Erfani, S.Si, M.Eng.
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Geophysical Engineering Department Engineering Faculty Universitas Lampung, Prof. Dr. Sumantri Brojonegoro Street No 1, Rajabasa District, Bandar Lampung, Indonesia 35145
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JGE (Jurnal Geofisika Eksplorasi)
Published by Universitas Lampung
ISSN : 23561599     EISSN : 26856182     DOI : https://doi.org/10.23960/jge
Core Subject : Science,
Earth & Planetary Sciences
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).
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Ilmu Bumi dan Planet (Lain-Lain)
Articles 221 Documents
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KARAKTERISTIK PETROLOGI KOMPLEKS INTRUSI KECAMATAN CIKALONGKULON KABUPATEN CIANJUR JAWA BARAT Firmansyah, Fahmi; Nugroho, Rio Priandri
JGE (Jurnal Geofisika Eksplorasi) Vol. 10 No. 2 (2024)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v10i2.394

Abstract

Penelitian tentang karakteristik batuan beku dapat berkontribusi pada penelitian lanjut tentang potensi sumber daya lainnya yang terkait dengan fenomena magmatisme, khususnya di lokasi yang memiliki sejarah magmatisme cukup panjang seperti di bagian barat Pulau Jawa. Studi karakteristik petrologi batuan beku pada penelitian ini dilakukan dengan menggunakan sampel yang diperoleh dari Cikalongkulon, Cianjur, Jawa Barat; sebuah lokasi dengan kompleks tubuh intrusi yang membentang hampir Barat-Timur. Dilakukan pengamatan lapangan dan petrografi guna menghasilkan sintesis terkait interaksi antaran tubuh batuan beku dan batuan samping di daerah penelitian. Dari observasi didapati bahwa terdapat metasomatisme yang terjadi akibat proses intrusi andesit terhadap batuan samping. Proses ini terjadi pada rentang suhu 270-320°C yang ditandai oleh kemunculan mineral sekunder berupa klorit, serisit, kalsit, kuarsa, dan epidot. Keberadaan metasomatisme ini juga mengindikasikan bahwa umur tubuh intrusi andesit harus lebih muda dari Miosen Tengah, berbeda dari interpretasi awal pada Peta Geologi Lembar Cianjur yang menempatkan tubuh batuan beku lebih tua dari batuan sedimen di sekitarnya.
2D INVERSION MODELING OF OIL AND GAS BASINS USING GRAVITY DATA IN TAMBELANG DISTRICT Gunawan, Belista; Permana, Nanda Ridki
JGE (Jurnal Geofisika Eksplorasi) Vol. 10 No. 2 (2024)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v10i2.421

Abstract

Pertamina Hulu Energi discovered a new source of oil and gas reserves in Tambelang, Bekasi Regency, which was named East Pondok Aren (EPN-001). These oil and gas reserves have great potential based on the oil flow test in the second Drill Stem Test. The drill data needs to be correlated with other supporting data such as geophysical methods to ensure the accuracy. Therefore, this research was conducted to examine the subsurface structure of oil and gas reserves in EPN-001 through 2D inversion modeling using the gravity method. Gravity satellite data was taken via the GGMPlus website with a total of 23,898 data in the form of gravity disturbance, geoid, and topography, so only terrain and bouguer corrections were carried out to get the Complete Bouguer Anomaly value. The research results show low anomaly values from -0.4463 – (-0.0339) mGal which are thought to be associated with alluvium lithology and the Lower Cibulakan Formation. In the 2D model, it can be seen that the drilling point in the Lower Cibulakan Formation layer has a density contrast value of -0.002 – 0.001 g/cc at a depth of 2590 m, and is known to be a reservoir that stores hydrocarbon reserves in the research area.
Cover JGE JGE, Editor
JGE (Jurnal Geofisika Eksplorasi) Vol. 10 No. 1 (2024)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v10i1.422

Abstract

Cover JGE
Foreword March 2024 JGE, Editor
JGE (Jurnal Geofisika Eksplorasi) Vol. 10 No. 1 (2024)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v10i1.423

Abstract

Foreword March 2024
Cover JGE JGE, Editor
JGE (Jurnal Geofisika Eksplorasi) Vol. 10 No. 2 (2024)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v10i2.439

Abstract

Cover JGE
Foreword July 2024 JGE, Editor
JGE (Jurnal Geofisika Eksplorasi) Vol. 10 No. 2 (2024)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v10i2.440

Abstract

Foreword July 2024
THE EFFECT OF INTRUSION ON THE PHYSICAL AND CHEMICAL PROPERTIES OF COAL Ogara, Evan Rosyadi; Tri Wahyuni; Al Hussein Flowers Rizqi
JGE (Jurnal Geofisika Eksplorasi) Vol. 11 No. 3 (2025)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v11i3.495

Abstract

Coal is a deposit of organic matter derived from plant remains that have undergone diagenesis process to form a coal seams. This study aims to determine the impact of intrusion on the physical and chemical characteristics of coal. The location of this research is in the Air Laya mining area, PT Bukit Asam Tbk, Tanjung Enim, South Sumatra and is part of the South Sumatra Basin which is well known as one of the coal bearing formation areas. Four (4) coal samples were analysed including proximate analysis, total sulphur content, and calorific value to measure moisture content, volatile matter, fixed carbon, ash content, and calorific value of the coal. Petrology and well log analysis was used to determine lithology and regression analysis was used to assess the effect of intrusion on coal characteristics. The results of the coal analysis in the research area reveal significant differences between coal samples located near the intrusion and those farther away. Coal located near the intrusion exhibits black colour, vitreous and conchoidal fracture. In contrast, coal farther from the intrusion shows a dull, blackish-brown, brownish streak, and uneven fracture. Coal near the intrusion shows lower moisture (1.5–1.7%) and volatile matter (17–25%), but higher ash content (7.9–8.2%), fixed carbon (67–73%), calorific value (7700–7968 kcal/kg), and sulphur (0.7–0.8%). In the other hand, coal farther from the intrusion has higher moisture and volatile matter, but lower fixed carbon, calorific value, and sulphur. The findings conclude that proximity to intrusion increases fixed carbon and calorific value but also raises sulphur levels, which may pose environmental and operational concerns.
FULL WAVEFORM INVERSION USING REVERSE TIME MIGRATION AND GOLDEN RATIO Aparajita, Made Jnanaparama; Pascaloa, M Rafif; Putra, Ahmad Dedi; Naufal, Harish Hartsa
JGE (Jurnal Geofisika Eksplorasi) Vol. 11 No. 3 (2025)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v11i3.502

Abstract

Seismic wave imaging techniques, such as conventional full-waveform inversion (FWI), which utilize numerical solutions of seismic wave equations, can be a valuable tool for estimating high resolution models of complex geological conditions. However, conventional FWI only uses one variable recording to find the minimum misfit in the step length calculation process, unlike the FWI golden ratio, which looks for minimum misfits using the four-variable recording. The method of calculating the four-variable recording continues to be updated until the velocity value from the FWI golden ratio is close to the actual velocity model values. Then, using reverse-time migration (RTM) in this case study is crucial for determining the final results of the velocity value in the FWI golden ratio. RTM takes over as the actual recording and is used in the process of calculating the gradient on this FWI golden ratio. The gradient is then calculated with a step length to get the model update. Using the golden ratio and gradient step length from RTM really helps reduce misfit. The final result, obtained using RTM and the golden ratio in the FWI method, produces an image that resembles the shape of the true synthetic model and yields updated velocity values that are not significantly different from the true velocity values in the synthetic model.
IDENTIFICATION OF IRON MINERALIZATION ZONES USING FORWARD MAGNETIC MODELING METHODS IN PELAIHARI – TANAH LAUT REGENCY Aulia Qorina; Selvi Misnia Irawati; Purwaditya Nugraha; Yoqi Ali Taufan
JGE (Jurnal Geofisika Eksplorasi) Vol. 12 No. 1 (2026)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v12i1.501

Abstract

Accuracy in identifying the distribution zone of iron ore mineral resources in the Pelaihari area, Tanah Laut Regency, is very important for exploration activities. This study aims to identify the presence of iron ore using magnetic data based on Analytical Signal maps from residual processing and modeling 2D subsurface results to see iron ore mineralization zones. The magnetic method used in this study is a geophysical exploration technique based on measurements of variations in magnetic anomaly intensity in rocks caused by the Earth's magnetic field. Magnetic data underwent magnetic correction, daily correction, and correction according to the International Geomagnetic Reference Field (IGRF) standard to determine the Total Magnetic Intensity (TMI). Based on the results of the study, iron ore mineralization zones were identified at a depth of approximately 10–40 m from the surface with a high susceptibility value of around 0.2 SI. The high residual anomaly response and Analytic Signal values between 23.4–36.0 nT/m indicate a shallow magnetic source localized by ultramafic rocks as the bedrock with a susceptibility value of approximately 0.097 SI at a depth of up to ±150 m, forming a prominent upward bulge. These characteristics indicate significant potential for laterite mineralization.
RESERVOIR CHARACTERIZATION USING SCALED QP AND QS AT POSEIDON FIELD, BROWSE BASIN Nuzul Cahyani Amalia; Ida Herawati
JGE (Jurnal Geofisika Eksplorasi) Vol. 12 No. 1 (2026)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v12i1.509

Abstract

Reservoir characterization is a critical component of hydrocarbon exploration and development. Seismic wave attenuation, which is closely linked to the physical properties of rocks, has emerged as an effective tool for this purpose. The Scaled Qp and Qs (SQp and SQs) methods represent advanced attenuation-based technique capable of discriminating lithology and fluid content through analysis of P-wave and S-wave attenuation. This study applies SQp and SQs attributes to characterize lithology and fluid distribution within the Plover Formation of the Poseidon Field, using 3D partial angle stack seismic data and well logs from three wells: Kronos-1, Poseidon-1, and Poseidon-2. Crossplot analysis indicate that low SQp values (0.02–0.2) are associated with sandstone, whereas higher SQp values (0.2–0.7) correspond to shale. In terms of fluid discrimination, high SQs values (0.55–0.7) identify gas-bearing zones, while lower SQs values (0.4–0.55) indicate brine-saturated interval. SQp and SQs volumes derived from simultaneous inversion reveal that gas-saturated sandstone reservoirs — characterized by low SQp and high SQs — are distributed along a southwest to northeast trend, consistent with the location of all three wells. These results demonstrate that SQp and SQs attributes effectively distinguish reservoir from non-reservoir lithology and delineate hydrocarbon-bearing zones, providing a reliable attenuation-based workflow for reservoir characterization in similar geological settings.

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