Delineation of Shallow Velocity Anomalies in the Timor Sea by 3D Checkshot Velocity Survey

1992 ◽  
Vol 23 (1-2) ◽  
pp. 317-322 ◽  
Author(s):  
Philip Smith
Keyword(s):  
Timor Sea ◽  
Velocity Anomalies

Depth conversion problems of the SKUA field

1989 ◽  
Vol 20 (2) ◽  
pp. 297 ◽  
Author(s):  
R.G. Cowley
Keyword(s):  
Average Velocity ◽  
Depth Map ◽  
Oil Field ◽  
Velocity Anomaly ◽  
Common Depth Point ◽  
Time Map ◽  
Timor Sea ◽  
Velocity Anomalies ◽  
The Common ◽  
The Difference

Before oil volumes and economics can be calculated for an oil field, the seismic time map must be converted to a depth map. The Skua Field, located in Permit AC/P2 in the Timor Sea, has proved particularly difficult to depth convert. Velocity anomalies and inconsistencies in the seismic times, termed 'lags', have created distortions in the seismic time map which require compensation. Beneath a velocity anomaly, both seismic undershoot and increased velocity, which are difficult to determine, must be compensated for during depth conversion. The current depth map was produced by smoothing through the pull-up regions on the time map, which required judgement, then depth, converting using a regional average velocity field. The seismic lag, which is the difference between the seismic time and an ideal vertical path travel time, can only be measured at the wells and appears to be unpredictable. The seismic lag between Skua-4 and Skua-5 was assumed to change linearly in order to produce the depth map. Large lags can be introduced into the data in the common depth point stack stage of data processing. The stacking velocity with the largest stack response does not necessarily result in the smallest lag error.

scholarly journals Influence of orbital forcing and sea level changes on sedimentation patterns in the Timor Sea during the last 260 ka

2008 ◽  
Vol 23 (1) ◽  
pp. n/a-n/a ◽  
Author(s):  
Eva Moreno ◽  
Franck Bassinot ◽  
François Baudin ◽  
Marie-Thérèse Vénec-Peyré
Keyword(s):  
Sea Level ◽  
Orbital Forcing ◽  
Sea Level Changes ◽  
Timor Sea ◽  
And Sea Level

Magnitude of velocity anomalies prior to earthquakes

1996 ◽  
Vol 101 (B5) ◽  
pp. 11217-11223 ◽  
Author(s):  
Mickaële Le Ravalec ◽  
Yves Gueguen ◽  
Tamaz Chelidze
Keyword(s):  
Velocity Anomalies

Horizontal energy flux of wind-driven intraseasonal waves in the tropical Atlantic by a unified diagnosis

2021 ◽  
Author(s):  
Qingyang Song ◽  
Hidenori Aiki
Keyword(s):  
Energy Flux ◽  
Wave Energy ◽  
Horizontal Distribution ◽  
Kelvin Waves ◽  
Asymmetric Distribution ◽  
Central Basin ◽  
Tropical Atlantic ◽  
Equatorial Wave ◽  
Wave Energy Flux ◽  
Velocity Anomalies

AbstractIntraseasonal waves in the tropical Atlantic Ocean have been found to carry prominent energy that affects interannual variability of zonal currents. This study investigates energy transfer and interaction of wind-driven intraseasonal waves using single-layer model experiments. Three sets of wind stress forcing at intraseasonal periods of around 30 days, 50 days and 80 days with a realistic horizontal distribution are employed separately to excite the second baroclinic mode in the tropical Atlantic. A unified scheme for calculating the energy flux, previously approximated and used for the diagnosis of annual Kelvin and Rossby waves, is utilized in the present study in its original form for intraseasonal waves. Zonal velocity anomalies by Kelvin waves dominate the 80-day scenario. Meridional velocity anomalies by Yanai waves dominate the 30-day scenario. In the 50-day scenario, the two waves have comparable magnitudes. The horizontal distribution of wave energy flux is revealed. In the 30-day and 50-day scenarios, a zonally alternating distribution of cross-equatorial wave energy flux is found. By checking an analytical solution excluding Kelvin waves, we confirm that the cross-equatorial flux is caused by the meridional transport of geopotential at the equator. This is attributed to the combination of Kelvin and Yanai waves and leads to the asymmetric distribution of wave energy in the central basin. Coastally-trapped Kelvin waves along the African coast are identified by along-shore energy flux. In the north, the bend of the Guinea coast leads the flux back to the equatorial basin. In the south, the Kelvin waves strengthened by local wind transfer the energy from the equatorial to Angolan regions.

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