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All Journal JGE (Jurnal Geofisika Eksplorasi) JOURNAL ONLINE OF PHYSICS
Naufal, Harish Hartsa
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Earth & Planetary Sciences Physics

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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.
DISTRIBUTED ACOUSTIC SENSING (DAS) FOR GEOTHERMAL EXPLORATION: A CASE STUDY OF THE KIZILDERE GEOTHERMAL FIELD Putra, Ahmad Dedi; Abdul Latiff, Abdul Halim; Mohd Noh, Khairul Arifin; Aparajita, Made Jnanaparama; Pascaloa, M. Rafif; Naufal, Harish Hartsa
JOURNAL ONLINE OF PHYSICS Vol. 11 No. 3 (2026): JOP (Journal Online of Physics) Vol 11 No 3
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v11i3.48530

Abstract

Geothermal resources have been popular around the world as a cleaner type of alternative energy source to hydrocarbons. Geothermal resources can be used for many purposes such as power generation, direct use, and more. In exploring geothermal resources, details and extensive investigations are required. Distributed acoustic sensing (DAS) is an advanced technology that is becoming more widely used in geoscientific studies, particularly for geothermal exploration. DAS records seismic signals using fiber optic cable instead of geophones, offering advantages over conventional methods in terms of cost, ease of deployment, and capability for continuous real-time monitoring. In this paper, we present a DAS data simulation to study the potential of DAS in geothermal exploration. This study involved several steps, including constructing a geological model based on the Kizildere Geothermal Field Model, simulating seismic data for DAS, and analyzing the DAS data in terms of signal quality and subsurface imaging resolution. The results demonstrated that DAS effectively imaged the subsurface and produced structural images comparable to those from geophones. Although DAS amplitudes are lower, the geological features remain clearly visible, suggesting that DAS is a viable and promising technology for geothermal exploration.  
Co-Authors Abdul Latiff, Abdul Halim Aparajita, Made Jnanaparama Mohd Noh, Khairul Arifin Pascaloa, M Rafif Pascaloa, M. Rafif Putra, Ahmad Dedi