The music of marine seismic: A marine vibrator system based on folded surfaces

Orji, Okwudili C.; Oscarsson-Nagel, Mattias; Söllner, Walter; Asgedom, Endrias G.; Trætten, Ø.; Voldsbekk, Rune

doi:10.1190/tle39040254.1

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…For example, electromagnetic vibroseis driven by linear synchronous motors consists of a U-shaped magnet track and a coil track and has been tested for performance and used in seismic exploration [13,14]. In recent years, the application of electromagnetic vibroseis is expanding to marine seismic exploration [15][16][17][18][19][20]. The research of marine electromagnetic vibroseis mainly focuses on prototype design and performance tests.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic-mechanical coupling analysis and optimization method of electromagnetic vibroseis

Chen

Xing

Sun

et al. 2023

Meas. Sci. Technol.

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Electromagnetic vibroseis is an important seismic wave excitation device. At present, the research of electromagnetic vibroseis mainly focuses on application and prototype design, lacking research on electromagnetic-mechanical coupling. Analyzing the electromagnetic-mechanical coupling and optimizing the air gap magnetic field is of great significance to improve the excitation quality of low-frequency seismic waves. In this paper, the electromagnetic-mechanical coupling is analyzed by studying the parameter force factor, and two novel optimal designs of the air gap magnetic field are proposed. Firstly, the finite element model of the air gap magnetic field is established, and the influence of the force factor distribution curve on the vibration signal is analyzed by using the Gaussian function and parameter spline difference (PSD) method. Further, an asymmetrical axial dual-magnet design is proposed to enhance the radial magnetic induction intensity Βr in the air gap. The design of adding a radial magnet to the outer yoke is proposed to compensate for the nonlinearity of the Βr in the air gap. The simulation results show that the asymmetric axial dual-magnet structure increases the Βr by 22.2% compared with the axial single-magnet structure. Adding a radial magnet to the outer yoke reduces the amplitude ratio of the third harmonic to the fundamental wave from 23.24% to 4.66%. It is necessary to consider the influence of the height of the driving coils on the maximum displacement, force factor distribution curve, and harmonic distortion.

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Section: Introductionmentioning

confidence: 99%

Electromagnetic-mechanical coupling analysis and optimization method of electromagnetic vibroseis

Chen

Xing

Sun

et al. 2023

Meas. Sci. Technol.

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Marine vibrator using electromagnetic acceleration

Lin,

Chen,

Huang

2024

Meas. Sci. Technol.

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Optimizing the low-frequency performance of the vibrator is an important direction for the development of marine vibrators. In order to solve the problems of high resonance frequency, small low-frequency displacement and difficulty in generating low-frequency signals of marine vibrators, this study proposed a strategy of high-frequency and low-frequency distributed vibration. In the low-frequency part, electromagnetic acceleration is innovatively combined with the vibrator, and the Ansys Maxwell finite element simulation software is used for analysis. In the high-frequency part, the traditional moving coil vibrator structure is used, and experimental verification is carried out in the anechoic tank. The simulation results show that the low-frequency part of the marine vibrator using electromagnetic acceleration can achieve low-frequency vibration, and the vibration is still relatively stable. The experimental results of the anechoic tank show that within the test frequency band, the sound source level generated meets the requirements of seismic exploration for high-frequency vibrators. This study uses the frequency segmentation strategy to improve the overall working efficiency of the vibrator and provides new ideas for the design of marine vibrators.

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Reducing the Environmental Impact of Seismic Acquisition While Improving Operational Efficiency by Incorporating New Technologies

da Silva,

Lopez

et al. 2024

Day 3 Wed, May 08, 2024

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Three R&D initiatives in seismic data acquisition are presented focusing on the reduction of environmental footprint while reducing the operational cost and increasing the efficiency in offshore field operations. The first initiative is the development of a new seismic sensor that can remain on the seafloor for up to five years, the On Demand Ocean Bottom Node - OD OBN (Lopez et al., 2023), helping to decrease the cost of seismic monitoring surveys. The second initiative is a new type of seismic source with lower environmental impact, the Marine Vibrator, which improves the usage of the available energy of the seismic source within the most useful frequency band for seismic acquisition, suppressing higher frequencies potentially harmful for marine mammals (Wartzok and Ketten, 1999). The third initiative is a pilot 3D seismic acquisition in deep-offshore Brazil using fiber optic cables, originally installed on the seafloor as part of a Permanent Reservoir Monitoring (PRM) system, which will be interrogated using Distributed Acoustic Sensing (DAS) while recording shots from a seismic streamer vessel present in the area. It is expected that the 3D seismic data acquired in this manner will offer a good understanding of the potential for DAS application for seismic data acquisition using fibers laid on the seafloor, considering the fiber's limitations in sensitivity and angular response. In addition to conventional applications for reservoir monitoring, these technologies are promising for applications linked to the energy transition, such as Carbon Capture and Storage (CCS) projects, where the expected low commercial value of the sequestered CO2 requires low-cost monitoring methods to be affordable.

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The music of marine seismic: A marine vibrator system based on folded surfaces

Cited by 3 publications

References 17 publications

Electromagnetic-mechanical coupling analysis and optimization method of electromagnetic vibroseis

Electromagnetic-mechanical coupling analysis and optimization method of electromagnetic vibroseis

Marine vibrator using electromagnetic acceleration

Reducing the Environmental Impact of Seismic Acquisition While Improving Operational Efficiency by Incorporating New Technologies

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