A case study: imaging OBS multiples of South China Sea

Wang, Xiangchun; Xia, Changliang; Liu, Xuewei

doi:10.1007/s11001-012-9148-2

Cited by 15 publications

(6 citation statements)

References 16 publications

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“…Despite all this, ghost reflections can be used for sea surface imaging to improve the resolution of marine seismic data (Laws & Kragh, 2002;Orji et al, 2010). If the receiver is deployed at adequate depths so that receiver ghost reflections can be distinguished from primaries, ghosts imaging come true, such as ocean-bottom seismometer (Dash et al, 2009;Wang et al, 2012;Shiraishi et al, 2017) and vertical cable seismic (VCS) (Hondori et al, 2019;Wang et al, 2019;Chen et al, 2022;Wang et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Application of deconvolution interferometry to receiver ghost reflection in vertical cable seismic survey

Wang

Liu

et al. 2023

Geophysical Prospecting

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Marine vertical cable seismic is to probe targets near the submarine with use vertical hydrophone array suspending in deep sea water. Despite imaging of primary reflections from vertical cable seismic data can provide seismic profiles with high resolution, its submarine illumination is much narrower than that of conventional towed-streamer seismic owing to the irregular geometry. In view of the fact that imaging of multiples can provides better subsurface illumination with fine resolution, we present a strategy for imaging of receiver ghost reflections from vertical cable seismic data, based on seismic interferometry by deconvolution. This method can convert first-order receiver ghosts into virtual primaries from the towed-streamer data without velocity model and sourcereceiver position. We illustrate the deconvolution interferometry for the receiver ghost reflections with the real vertical cable seismic data in Shenhu area, South China Sea and further obtain virtual primary reflections. Finally, we use these virtual primaries to successfully construct a stacked image and obtain a post-stack migration image with conventional seismic data process method. This stacked and migrated image significantly extends the submarine illumination with higher resolution and it is useful in characteristics recognition of hydrate-bearing sediments and free gas.

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Section: Introductionmentioning

confidence: 99%

Application of deconvolution interferometry to receiver ghost reflection in vertical cable seismic survey

Wang

Liu

et al. 2023

Geophysical Prospecting

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“…In existing methods, the seismic field is often applied to detect Scholte waves. Seismic measurement equipment such as Ocean Bottom Seismometers (OBSs) [ 12 , 13 , 14 ] and geophones [ 6 , 9 ] is used to record the seismic signal at the ocean bottom. Then, the velocity characteristics in the fields can be extracted from the recorded signal [ 2 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Study on a Detection Technique for Scholte Waves at the Seafloor

Liang

Wang

et al. 2022

Sensors

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Scholte waves at the seafloor have significant potential for underwater detection and communication, so a study about detecting Scholte waves is very meaningful in practice. In this paper, the detection of Scholte waves at the seafloor is researched theoretically and experimentally. Acoustic models with the multilayer elastic bottom are established according to the ocean environment, and a tank experiment is designed and carried out to detect Scholte waves. Different from detecting Scholte waves in the seismic wavefield, a technique for detecting Scholte waves in the sound pressure field is proposed in this paper. The experimental results show that the proposed technique can detect Scholte waves effectively, and there are no problems such as seabed coupling and the effect of wave speeds. Furthermore, the results also show that this detection technique is still effective in conditions with a sediment layer. The existence of sediment layers changes the acoustic field conditions and affects the excitation of Scholte waves.

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“…As multiple waves penetrating into the subsurface several times have longer traveling paths and contain abundant reflection information, they can produce a broader illumination of subsurface than primary waves. Water-layer multiples have been used by several authors in the migration of OBS data (i.e., [2][3][4][5][6]). Recently, Kazuya et al [7] proposed to use seismic interferometry to address the OBS data for wide-angle imaging.…”

Section: Introductionmentioning

confidence: 99%

Depth Migration Based on Two-Way Wave Equation to Image OBS Multiples: A Case Study in the South Shetland Margin (Antarctica)

et al. 2020

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With the development of marine seismic exploration, the ocean bottom seismometer (OBS) as a new seismic acquisition technology has been widely concerned. Although multiple waves are frequently viewed as noises, they may carry a wealth of subsurface information and produce a broader illumination than primary waves. To perform multiple wave imaging, we propose to utilize a two-way wave equation depth wavefield extrapolation method which is rarely used in this field. A simple dipping model is imaged by using primary and multiple waves, which proves the superiority of multiple waves in imaging over the primary waves and lays a foundation for practical application. Moreover, the comparison of multiple imaging results by reverse time migration and those by our proposed method demonstrates that our proposed method requires less storage space. In this study, we apply this migration method to actual OBS data collected in the South Shetland margin (Antarctica), where gas hydrates have been well documented. Firstly, the wavefield separation method is adopted to process the OBS data, so as to produce reliable primary and multiples waves; secondly, the ray-tracing method is used to derive the velocity field; and finally, the depth wavefield extrapolation method based on the two-way wave equation is applied to image primary and multiple waves. Migration results show that multiple waves provide a broader illumination and a clearer sediment structure than primary waves, especially for the highly shallow reflections.

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A case study: imaging OBS multiples of South China Sea

Cited by 15 publications

References 16 publications

Application of deconvolution interferometry to receiver ghost reflection in vertical cable seismic survey

Application of deconvolution interferometry to receiver ghost reflection in vertical cable seismic survey

Study on a Detection Technique for Scholte Waves at the Seafloor

Depth Migration Based on Two-Way Wave Equation to Image OBS Multiples: A Case Study in the South Shetland Margin (Antarctica)

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