Bulletin of the Geological Society of Malaysia, Volume 77, May 2024, pp. 27 – 35
Yasir Bashir1,2,*,Abdul Halim Abdul Latiff2, Muhammad Sajid3
1 Department of Geophysical Engineering, Faculty of Mines, Istanbul Technical University, 34467 Istanbul, Turkiye
2 Centre for Subsurface Imaging (CSI), Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak, Malaysia
3 PETRONAS Research Sdn. Bhd., Lot 3288 & 3289, Off Jln Ayer Itam, Kawasan Institusi Bangi, 43000 Kajang, Selangor, Malaysia
* Corresponding author email address: Ybashir@itu.edu.tr
Abstract: Over the last few years, the petroleum giant and its partner have effectively implemented new marine seismic technologies in this part of the world. During the acquisition phase, the industry has observed the introduction of novel broadband acquisition techniques such as dual-sensor cable, multiple towed streamers (over/under), slanted and variable depth streamers, and isometric areal recording. The application of these techniques has resulted in a noteworthy enhancement of the recorded data’s bandwidth. The focus of this paper is on the improvement of seismic bandwidth expansion resulting from advancements in marine broadband acquisition, innovative processing techniques, and inversion methodology. The outcome leads to a noteworthy enhancement in the vertical resolution, which proves to be valuable in the identification of thin stacked pay beds and the creation of a reservoir model that is constrained by seismic data. This paper focuses on the imaging aspect, particularly the complex structures. The utilization of wide and full azimuth (Circular) recording and the resolution of Gas wipeout issues through seabed acquisition with Ocean Bottom Cables (OBC) have been advantageous. By utilizing de-ghosted or far-field signature modeled techniques on the processing side, it is possible to increase the bandwidth for both legacy and modern high-quality data, such as Q-marine. A novel de-convolution technique has been developed, which can enhance signal frequency to a considerable extent while minimizing or eliminating any impact on noise. The article presents various wavelet transform techniques that can effectively enhance the signal-to-noise ratio (S/N). The methods are noteworthy due to their ability to be swiftly executed post-stack while incurring minimal expenses. Further, the inversion techniques, with a focus on stochastic elastic inversion, generates broadband data, enabling the identification of pay sand that falls below the quarter of wavelength criteria. The developed techniques are novel and have been validated using authentic Offshore Malaysia data.
Keywords: Seismic exploration, bandwidth expansion, resolution, technology
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Manuscript received 17 July 2023;
Received in revised form 9 October 2023;
Accepted 17 November 2023
Available online 30 May 2024
https://doi.org/10.7186/bgsm77202404
0126-6187; 2637-109X / Published by the Geological Society of Malaysia.
© 2024 by the Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution (CC-BY) License 4.0.
