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All Journal Jurnal Geofisika Scientific Contributions Oil and Gas
Permana Citra Adi
Pertamina EP
Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Energy Physics

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Koreksi Akusisi Ocean Bottom Node (OBN) menggunakan First Break Positioning dan Hodogram: Studi Kasus Akuisisi Seismik 3D XRAY OBN, Offshore North West Java Permana Citra Adi; Yayat Supriyatna
Jurnal Geofisika Vol 20 No 1 (2022): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v20i1.507

Abstract

We present the result of applying a least square inversion approach and particle motion analysis on direct arrival wave to estimate-related error associated with ocean bottom nodes (OBN) positioning and Geophone orientation. The initial Nodes coordinates are based on acoustic positioning method at the time of deployment and before retrieval. These positions are computed on the assumption a constant water velocity which was measured directly by logging tool sound velocity profile (SVP) and therefore there are possible to have a small error in the node positions. A few nodes demonstrated excessively high shifts due to dragged by fishing net and although the node has censor to measure the Geophone orientation, some of them were not optimally re-orientated to acquisition orientation reference. Failing to correct for these errors could lead to artifacts in the velocity model, create false structures and infidelity in Geophone data. The result of these corrections on field data can improve P-Wave subsurface image quality and also correct the vector infidelity of Geophone data for S-Wave imaging, so the amplitude and kinematic information on the data is ready to be used for further analysis such as on Quantitative Interpretation (QI). Keywords: OBN, positioning, Geophone orientation, vector fidelity
Pseudo-3D Depth Reconstruction from Multi-Vintage 2D and 3D Seismic Data in The Offshore Southeast Sumatra Dadang Ramdan; Abdul Haris; Dewi Manik Darmayanti; Permana Citra Adi; Iwan Rudiyanto; Muhamad Yanuar Mahardi
Scientific Contributions Oil and Gas Vol 49 No 2 (2026)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v49i2.2110

Abstract

The availability of legacy 2D seismic data in many mature basins offers an opportunity to generate 3D-like subsurface images without the need for expensive 3D seismic acquisition. This study proposes and demonstrates a workflow to construct a pseudo-3D seismic volume from multi-vintage 2D and 3D seismic data in Offshore Southeast Sumatra. The objective is to improve subsurface imaging and depth-structure mapping while minimizing exploration cost and time. Major challenges include variations in amplitude, frequency, phase, and time alignment across datasets acquired with different parameters, as well as determining the optimum line spacing required for reliable 3D reconstruction. The workflow begins with 2D–3D matching and amplitude balancing, followed by spatial interpolation using the 3D Sparse Radon Interpolation technique, which reconstructs coherent reflectors between 2D lines. The generated pseudo-3D volume is then merged with available 3D seismic data to create a unified volume for interpretation. Subsequent time-to-depth conversion is performed using interval velocity data, and the velocity model is iteratively updated using time-preserving tomography based on depth mis-ties between seismic horizons and well markers until convergence is achieved. The resulting depth-structure map provides improved consistency with well control and reveals subtle structural features that were not observed in the individual 2D datasets. The proposed approach demonstrates that pseudo-3D reconstruction from multi-vintage 2D seismic data can serve as a practical and cost-efficient alternative for early-stage exploration and pre-survey evaluation, especially in offshore areas where 3D seismic acquisition is economically constrained.
Co-Authors Abdul Haris Dadang Ramdan Dewi Manik Darmayanti Iwan Rudiyanto Muhamad Yanuar Mahardi Yayat Supriyatna