Numerical simulation for accuracy of velocity analysis in small-scale high-resolution marine multichannel seismic technology

Luo, Di; Cai, Feng; Wu, Zhiqiang

doi:10.1007/s11802-017-3145-7

Cited by 3 publications

(1 citation statement)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Small-scale and high-resolution marine multichannel seismic detection technology using large energy sparkers seismic source is characterized by a high dominant frequency, wide bandwidth, and high resolution. When compared with traditional method, this technology has the advantages of high resolution (the vertical resolution is up to 1-3 m) and high detection precision (Luo et al, 2017). The high-resolution multichannel seismic data used in this study were acquired using a SIG pulse L5 Sparker with a shooting energy of 20 kJ at every 12.5 m, a 293.75 m streamer (48 channel, 6.25 m group interval) and 12 times stacking fold.…”

Section: Small-scale and High-resolution Multichannel Seismicmentioning

confidence: 99%

Geophysical evidence for submarine methane seepage on the Western slope of Okinawa Trough

Luo

Cai

et al. 2022

Front. Earth Sci.

Self Cite

View full text Add to dashboard Cite

Identifying seafloor methane seepage efficiently has important implications for assessing environmental impact, reducing the uncertainty of top seal integrity, understanding the petroleum system, and mitigating the drilling hazards due to shallow gas influx. Pore water geochemistry analyses suggest that the study area has an extremely high methane seepage flux and active methane anaerobic oxidation processes. However, geochemical data cannot provide details about the internal seepages. The geophysical dataset from the Western slope of Okinawa Trough, including 2D high-resolution seismic, sub-bottom profiles, and bathymetry, gives us a good opportunity to understand the detailed characteristics of methane seepages in this study. Geophysical data have revealed numerous methane seepage-related features such as seismic chimneys, pockmarks, submarine domes, and amplitude anomalies, including bright spots and enhanced reflections. Pockmarks and domes are often associated with seismic chimneys, indicating that fluid migration is important in their formation. The various geophysical expressions may represent different stages of methane seepage. Fluid quickly drains, causing severe sediment deformation and forming pockmarks, whereas domes may indicate the early stages of fluid discharge. Chimneys that do not extend to the seafloor may indicate that the venting is gradual and focused. Flares linked to domes or pockmarks may indicate that the fluid migration is active. Several factors triggered the existence of methane seepages on the Western slope of the Okinawa Trough, including tectonic setting, overpressure and rapid sedimentation.

show abstract

Section: Small-scale and High-resolution Multichannel Seismicmentioning

confidence: 99%