Development of vertical cable seismic (VCS) system for seafloor massive sulfide (SMS)

Asakawa, Eiichi; Murakami, Fumitoshi; Tsukahara, H.; Mizohata, Shigeharu

doi:10.1109/oceans.2014.7003171

Cited by 7 publications

(2 citation statements)

References 7 publications

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“…Derived from defence research, the VCS method was successfully applied to conduct offshore seismic survey, for highquality subsalt imaging [3,7], for low-angle fault scarp imag-ing and assessment of remaining exploration potential [8], for hydrothermal deposit exploration [5], for seafloor massive sulphide survey [9][10][11][12], and for natural gas hydrate exploration [4,[13][14][15]. All these applications reveal that the VCS technique is an effective approach to exploiting and developing the complex offshore oil and gas fields, which can provide superior seismic image compared with conventional marine seismic method.…”

Section: Introductionmentioning

confidence: 99%

Hydrate-Bearing Sediment Imaging of Ghost Reflection in Vertical Cable Seismic Data Using Seismic Interferometry

Wang

Liu

et al. 2022

Geofluids

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Marine vertical cable seismic (VCS) collects seismic waves by hydrophone array vertically suspended in seawater to prospect the offshore geological structure and monitor the reservoir. Due to its irregular source-receiver geometry, the primary imaging has narrow illustration coverage. Here, we proposed a cross-correlation transformation based on ghost wave interferometry. This method can transform the ghost reflections from the vertical cable seismic profile into the virtual surface seismic primaries just like those excited by the source and recorded by marine seismic towed-streamer below sea surface. After processing these virtual primaries with conventional method, we can obtain the ghost reflection imaging section with high resolution which effectively extend the illustration footprints in the subsurface. By application of this transform, virtual primaries are generated from the first-order ghost reflections of the actual VCS data. Then, migration of these virtual primaries provides a high-resolution image of hydrate-bearing sediments.

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Section: Introductionmentioning

confidence: 99%

Hydrate-Bearing Sediment Imaging of Ghost Reflection in Vertical Cable Seismic Data Using Seismic Interferometry

Wang

Liu

et al. 2022

Geofluids

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“…Based on this experiment, they manufactured autonomous VCS recording systems in 2010. Using these VCS acquisition systems, they conducted seafloor massive sulphide (SMS) survey in Izena Cauldron in 2011 and 2013, respectively (Asakawa et al, 2014a;2014b;2015;. The first survey gives the largescale and deeper structure of hydrothermal system and the second survey gives the clear structure of SMS deposit.…”

Section: Introductionmentioning

confidence: 99%

Reverse Time Migration of Vertical Cable Seismic Data to Image Hydrate-Bearing Sediments With High Resolution

et al. 2021

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Marine vertical cable seismic (VCS) is a promising survey technique for submarine complex structure imaging and reservoir monitoring, which uses vertical arrays of hydrophones deployed near the seafloor to record seismic wavefields in a quiet environment. Recently, we developed a new type of distributed VCS system for exploration and development of natural gas hydrates preserved in shallow sediments under the seafloor. Using this system and air-gun sources, we accomplished a 3D VCS yield data acquisition for gas hydrates exploration in the Shenhu area, South China Sea. In view of the characteristics of VCS geometry, we implement reverse time migration (RTM) on a common receiver gather to obtain high-resolution images of marine sediments. Due to the unique acquisition method, it is asymmetrical for the reflection path between the sources and the receivers in the VCS survey. Therefore, we apply accurate velocity analysis to common scatter point (CSP) gathers generated from common receiver gathers instead of the conventional velocity analysis based on common depth point gathers. RTM with this reliable velocity model results in high-resolution images of submarine hydrate-bearing sediments in deep water conditions. The RTM imaging section clearly shows the bottom simulating reflector (BSR) and also the reflection characteristics of the hydrate-bearing sediments filled with consolidated hydrates. Moreover, its resolution is relative to that of acoustic logging curves from the nearby borehole, and this imaging section is well consistent with the synthetic seismogram trace generated by the logging data. All these results reveal that VCS is a great potential technology for exploration and production of marine natural gas hydrates.

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Research on Seismic Wave Attenuation in Gas Hydrates Layer Using Vertical Cable Seismic Data

Wang

Liang

2018

Pure Appl. Geophys.

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Development of vertical cable seismic (VCS) system for seafloor massive sulfide (SMS)

Cited by 7 publications

References 7 publications

Hydrate-Bearing Sediment Imaging of Ghost Reflection in Vertical Cable Seismic Data Using Seismic Interferometry

Hydrate-Bearing Sediment Imaging of Ghost Reflection in Vertical Cable Seismic Data Using Seismic Interferometry

Reverse Time Migration of Vertical Cable Seismic Data to Image Hydrate-Bearing Sediments With High Resolution

Research on Seismic Wave Attenuation in Gas Hydrates Layer Using Vertical Cable Seismic Data

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