International Journal of Geophysics / 2009 / Article / Tab 2

Research Article

Model-Based Identification of the Base of the Gas Hydrate Stability Zone in Multichannel Reflection Seismic Data, Offshore Costa Rica

Table 2

The processing flow applied to profile BGR99-46 is divided into two parts. The offset stacks are created after the application of a band-pass filter and amplitude recovery, while the full CMP stack is created after an additional deconvolution and automatic gain control (AGC). Finally, the profile is either migrated in depth (for retrieving BSR depths) or migrated in time (for BSR interpretation).

Processing stepsParameters

Ormsby band-pass filter3-6-60-120 Hz
Normal Moveout (NMO) velocity analysisEvery 100 CMP ( 625 m)
True amplitude recovery (TAR): spherical divergence correction [37]
Offset Amplitude Recovery (first order correction of source and receiver array geometry)Mean frequency, RMS velocity function, gun array length, receiver group length (as listed above in Table 1)
Offset CMP stacksEvery 50 channels, offset range: 625 m
Predictive deconvolutionOperator length: 50 ms, predictive distance: 16 ms
NMO correctionNMO stretch mute values: 30%, 100%
Automatic gain control (AGC)Time window: 500 ms
CMP stackMean
Kirchhoff time/depth migrationMax. dip: , max. frequency: 80 Hz, smoothed velocity field

Article of the Year Award: Outstanding research contributions of 2020, as selected by our Chief Editors. Read the winning articles.