Shallow-water acoustic variability experiment 2015 (SAVEX15) in the northern East China Sea

2016 ◽  
Vol 140 (4) ◽  
pp. 3012-3012
Author(s):  
Hee-Chun Song ◽  
Sea-Moon Kim ◽  
Byoung-Nam Kim ◽  
SungHyun Nam
Keyword(s):  
Shallow Water ◽  
East China Sea ◽  
East China ◽  
China Sea ◽  
Acoustic Variability

Overcoming the challenges of a shallow-water sparse wide-azimuth survey to improve deep reservoir imaging in the East China Sea

2019 ◽  
Vol 38 (8) ◽  
pp. 610-616
Author(s):  
Yun Wei ◽  
Hua Chen ◽  
Senqing Hu ◽  
Peipei Deng ◽  
Yongdeng Xiao ◽  
...  
Keyword(s):  
Shallow Water ◽  
East China Sea ◽  
Three Dimensional ◽  
Water Layer ◽  
Velocity Model ◽  
East China ◽  
The East China Sea ◽  
China Sea ◽  
Well Data ◽  
The Impact

A new broadband wide-azimuth towed-streamer (WATS) survey was acquired to better resolve reservoir compartments in a shallow-water region of the East China Sea. To offset the shortcomings of narrow-azimuth acquisition along the strike direction, two vessels were added side-by-side as additional source vessels to form the WATS acquisition geometry for this survey. This WATS acquisition was much sparser than typical WATS surveys used in deepwater environments due to its one-sided configuration. The combination of sparse acquisition, shallow water, and deep targets set the challenge of how to optimally reveal the potential of side-gun data to improve the final image. Three-dimensional effects and severe aliasing in the crossline direction pose significant challenges for side-gun data processing. We present a comprehensive workflow to resolve these challenges consisting of 3D deghosting, 3D model-based water-layer demultiple, 3D surface-related multiple elimination, and 4D regularization for sparse and shallow-water wide-azimuth data. A tilted orthorhombic velocity model is built with better constraints from the wide-azimuth data, leading to improved fault positioning and imaging. Side-gun data clearly enhance the final target reservoir image and tie better with well data due to improved illumination. A new channel is discovered based on interpretation from the inverted VP/VS, explaining the previous incorrect prediction for one failed well that was drilled into a thinner and shallower channel unconnected to the main reservoir. An analysis of the impact of side-gun data from different offsets and azimuths shows that better azimuthal distribution within middle offset ranges had a more significant impact than far offsets in the final image of this survey. This information provides valuable reference in similar geologic conditions for future acquisition designs.

Effects of East China Sea shallow-water environment on acoustic propagation

2003 ◽  
Vol 28 (2) ◽  
pp. 192-211 ◽  
Author(s):  
P. Abbot ◽  
S. Celuzza ◽  
I. Dyer ◽  
B. Gomes ◽  
J. Fulford ◽  
...  
Keyword(s):  
Shallow Water ◽  
East China Sea ◽  
Water Environment ◽  
Acoustic Propagation ◽  
East China ◽  
China Sea ◽  
Shallow Water Environment

Tanaidacea (Crustacea: Peracarida) from Japan. I. Apseudomorpha from the East China Sea, Seto Inland Sea, and Nansei Islands

Zootaxa ◽  
2006 ◽  
Vol 1341 (1) ◽  
pp. 29 ◽  
Author(s):  
KIM LARSEN ◽  
MICHITAKA SHIMOMURA
Keyword(s):  
New Species ◽  
Shallow Water ◽  
East China Sea ◽  
New Genus ◽  
Seto Inland Sea ◽  
East China ◽  
The East China Sea ◽  
China Sea ◽  
Two New Species ◽  
Nansei Islands

The Japanese shallow water fauna of Tanaidacea is examined. One new genus in the Parapseudidae Longipedis and two new species, L. fragilis and Hoplomachus toyoshious, are described. Androgynella nipponicus is herein re-erected. Apseudes nasutus is transferred to Longiflagrum.

Geoacoustic model of the transverse acoustic variability experiment area in the northern East China Sea

2013 ◽  
Vol 17 (3) ◽  
pp. 267-278 ◽  
Author(s):  
Woo-Hun Ryang ◽  
Seong-Pil Kim ◽  
Seongil Kim ◽  
Dae-Choul Kim
Keyword(s):  
East China Sea ◽  
East China ◽  
China Sea ◽  
Transverse Acoustic ◽  
Acoustic Variability
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