GEOLOGICAL SOCIETY OF THE PHILIPPINES

 

 

Reprocessing of Selected 2-D Multi-Channel Seismic Reflection Data Collected from the Recent SO-197 Cruise in the South China Sea

 

JMP Caldito-Montano1, NEB Pellejera1, B Libao1, P. Espallardo1, MT Arcilla1, D. Franke2, A Ehrhardt2

1University of the Philippines, Diliman
2Bundesanstalt fur Geowissenschaften und Rohstoffe (BGR), Hannover

 

Abstract

 

Two seismic lines, BGR08-112 and BGR08-124 from the recent SO197 Survey in the South China Sea were reprocessed using the standard processing flow for a typical marine 2D seismic line. All data were processed using Promax 2D/3D version 2003.19.01. Data were resampled to 4ms to speed up processing. Interactive Spectral Analysis was done before a zero phase Ormsby bandpass filter of 4-8-80-160 Hz was used on the data. Prestack predictive deconvolution was applied to FFID (field file identification) shot records. Interval velocities were picked at regular 3km intervals. The picking module included a semblance spectrum with an interval velocity graph, CDP supergather, dynamic stack and constant velocity stack. Data were sorted into supergathers consisting of 7 CDPs before velocity analysis precompute was applied. Multiple reflections were then attenuated using Radon Velocity Filter after applying NMO (normal moveout) correction. Post-stack processing included Kirchhoff time migration, top muting of the water column and FX deconvolution. These produced improved temporal and spatial resolution, leading to better interpretability of the seismic profiles.

 

 
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