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All Journal Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Jurnal Fisika Unand
Nafian, Muhammad
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Astronomy Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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The Identification of the Existence of a Fault Structure on Gravity and Audio Magnetotulleric Data in the Area of Mount Kubing, Belitung Sanjaya, Edi; Nafian, Muhammad; Suwondo, Suwondo; Fadillah , Muhammad Hasnan; Shafa, Dias
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 13 No. 1 (2023)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v13n1.p81-94

Abstract

Mount Kubing holds significant potential as a tourist attraction, despite being situated in a tectonic zone prone to faults. Its size and attractions make it suitable for both travel and exploration. Hence, the study has been conducted to identify subsurface structures that can identify the structural fault lines when the mitigation occurred during an earthquake or landslide. The derivative analysis method is used to determine the type of structures. The results of the derivative analysis indicate the direction of the fault structure on a Northwest-Southeast, and Southwest -Northeast that is controlled by two different faults. The fault caused by depression from granitic body and silt with FHD and SVD gravity value around -3 mGal until 1 mGal that showing the indication of normal fault and reverse fault in the research location with depth estimation curve (RAPS) approximately 500 meters in the subsurface of the earth. Whereas in 2D Audio Magnetotelluric modelling, it is identified that the groundwater reservoir layer is at a depth of 70-85 meters below the surface which is recognized as a semi-stressed reservoir with a value of 20-27 mv/nT in complex silt and sandstone.
Physics-Guided Multi-Attribute Petrophysical Inversion for Quantifiying Acoustic Impedance and Porosity in the F3 Reservoir Rahman, Fadhlur; Haris, Abdul; Ralanarko, Dwandari; Purba, Humbang; Rulandoko, Wrahaspati; Riyadi, Praditio; Nafian, Muhammad
Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics AL-FIZIYA JOURNAL OF MATERIALS SCIENCE, GEOPHYSICS, INSTRUMENTATION AND THEORETICAL PHYSICS VOL.7, N
Publisher : Physics Study Programme, Faculty of Science and Technology UIN Syarif Hidayatullah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/fiziya.v7i2.47186

Abstract

This study introduces a physics-guided multi-attribute inversion (PG-MAI) approach to estimate acoustic impedance and porosity from post-stack seismic data using Bayesian Ridge Regression. The method integrates ten seismic attributes—including amplitude, frequency, and geometric features—into a regularized linear regression framework with Bayesian formulation. Applied to the F3 Block in the Dutch North Sea, the workflow includes temporal upsampling, attribute extraction, and model calibration using two well logs. The inversion results demonstrate high spatial coherence and alignment with geological structures. Validation at both wells shows strong agreement between predicted and measured log values, with correlation coefficients exceeding 0.90 for both acoustic impedance and porosity. Zones of low impedance and high porosity correspond to interpreted deltaic sands and lobate geometries, reflecting the facies heterogeneity of the F3 depositional environment. These outcomes suggest that the inversion framework effectively captures lithological variability, making it valuable for reservoir delineation in similarly complex siliciclastic systems.
PREDICTIVE DECONVOLUTION BASED ON SEISMIC WAVEFORM DIAGNOSTICS FOR ENHANCED MARINE IMAGING RESOLUTION Fahmi, Muhammad; Syamputra, Dhani Nur Indra; Raharjo, Wiji; Sari, Tri Wulan; Nafian, Muhammad
Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics AL-FIZIYA JOURNAL OF MATERIALS SCIENCE, GEOPHYSICS, INSTRUMENTATION AND THEORETICAL PHYSICS VOL.8, N
Publisher : Physics Study Programme, Faculty of Science and Technology UIN Syarif Hidayatullah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/fiziya.v8i1.48064

Abstract

Short-period multiples are a persistent problem in marine seismic processing, particularly in shallow-water environments where near-surface reverberations interfere with primary reflections and decrease temporal resolution. Predictive deconvolution remains a widely used method for attenuating such coherent noise. However, conventional implementations often apply fixed operator parameters, limiting their adaptability to waveform variations across time and offset. This study introduces a predictive deconvolution framework guided by seismic waveform diagnostics, in which operator parameters specifically prediction lag and filter length are selected based on trace characteristics such as waveform periodicity and spectral energy distribution. The approach is designed to improve multiple suppression while preserving the fidelity of primary reflections on a 2D marine pre-stack seismic dataset acquired in a shallow offshore setting characterized by strong short-period multiples and limited bandwidth. The results demonstrate around 25% increase in frequency bandwidth, improved reflector continuity, and reduced coherent noise in pre-stack gathers. Compared to conventional deconvolution, the waveform informed design achieves a more effective balance between attenuation and resolution. The proposed approach is applicable to modern marine datasets where high-resolution imaging is limited by near-surface interference.
Three-Dimensional Subsurface Structural Modeling of a Geothermal Prospect in Banda-Neira, Central Maluku, Based on GGMPlus Gravity Data Nafian, Muhammad; Fahmi, Muhammad; Rahma, Farah Aliya; Suciarty A H, Vionna
Jurnal Fisika Unand Vol 14 No 4 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.4.360-367.2025

Abstract

The Banda Island is located at the convergence of three major tectonic plates: the Indo-Australian Plate, the Eurasian Plate, and the Pacific Plate. Banda Neira Island holds significant geothermal potential that can be utilized as an energy resource. Therefore, this study was conducted to investigate the subsurface structure of the geothermal prospect area using the gravity method. In the gravity data processing, derivative analysis results indicate that the Banda Neira geothermal prospect is controlled by multiple fault systems: faults associated with the collapse of the older Banda Neira caldera, as well as local faults confirmed to be reverse faults. In the 3D modeling results, a geothermal reservoir layer is identified with an estimated density of 1.67–1.77 g/cm³, interpreted as a mixture of tuff and minor lava. The reservoir is predominantly water-filled, inferred from its relatively low density, and is located at depths of approximately 150–700 meters. In the second slicing profile, oriented north-south, a cap rock layer is observed at depths of 0–300 meters from the measurement point, with a density of 1.67–1.77 g/cm³, overlying a volcanic reservoir layer found at 200–700 meters depth, with higher densities ranging from 3.57–3.67 g/cm³.
Co-Authors Abdul Haris Fadhlur Rahman, Fadhlur Fadillah , Muhammad Hasnan MUHAMMAD FAHMI Purba, Humbang Rahma, Farah Aliya Ralanarko, Dwandari Riyadi, Praditio Rulandoko, Wrahaspati Sanjaya, Edi Shafa, Dias Suciarty A H, Vionna Suwondo Suwondo Syamputra, Dhani Nur Indra Tri Wulan Sari, Tri Wulan Wiji Raharjo