A Brief Introduction For Multi-Component Seismic Data Processing

1. A Brief Introduction For Multi-Component Seismic Data Processing

2. X,Y component processing S wave statics CCP binning P-SV velocity analysis P-SV wave NMO P-SV wave imaging Extraction of attributes Z component processing Statics Pre-stack noise attenuation Surface consistent processing Velocity analysis, NMO, stack Imaging 1. Introduction Since 1983 BGP has experimented and developed multi-component technology. This expertise has evolved into a series of integrated techniques which have been tested and have proved to be reliable suite of exploration and development seismic services. Integrated Techniques

3. before after S-wave Statics

4. PSV NMO Non-hyperbolic NMO Super gather Conventional NMO

5. P-P PSV Final processing results

6. Gas-bearing sandstone Lithology prediction using Vp/Vs ratio

7. 2. Multi-Component Seismic Data Processing 2.1The Proposed Flow Chart for 2D Seismic Data Processing 2.1.1 P-P Wave Basic Processing Sequence Demultiplexing  Shot Gathers Display  Geometry Update  Sort to Vertical Component  Edit bad traces/shots, De-spiking  Elevation Static Correction  First Break Picking, Refraction Static Correction 

8. Spherical Divergence Correction  Surface consistent amplitude compensation  Surface consistent deconvolution  Sort to CMP gather  First pass velocity analysis (every 500 m) and stack  First Pass Surface Consistent Residual Statics Correction  Predictive Deconvolution or Inverse Q-filter  Second pass velocity analysis (every 250m) and stack  Second Pass Surface Consistent Residual statics Correction  Kirchhoff Pre-stack Time Migration  NMO Inverse 

9. Third Pass Velocity Analysis  Kirchhoff Pre-stack Time Migration  NMO Inverse and SEGY RAW PSTM Gather  NMO, Mute and Stack  F-X deconvolution  Post-stack Deconvolution  Time variant filter  Scaling  Final Result

10. 2.1.2 P-S Wave Basic Processing Sequence Demultiplexing  Shot Gather and Near Offset Display  Geometry Update  First Break Picking, Refraction Static Correction  Sort to Horizontal Component  Construction of a Vp/Vs  Negative offset polarity reversal, reverse trace analysis and correction  Rotation analysis and tests  PS static application  Edit bad traces/shots, de-spiking 

11. FK Filter at Shot/Receiver Domain(Optional)  Spherical Divergence Correct  Surface consistent amplitude compensation  Surface consistent deconvolution  Sort to CCP  CCP velocity analysis (every 500 m) and stack  1st Surface Consistent Residual statics Correction  Predictive Deconvolution or Inverse Qs-filter  2nd velocity analysis (every 250m) and stack  2nd Surface Consistent Residual statics Correction  Offset separation (positive and negative offsets) prior to PSTM  Kirchhoff Pre-stack Time Migration 

12. NMO Inverse  Third Pass Velocity Analysis  Kirchhoff Pre-stack Time Migration  NMO Inverse and SEGY RAW PSTM Gather  NMO, Mute and Stack  F-X deconvolution  Post-stack Deconvolution  Time variant filter  Scaling  Final Result

13. 2.1.3 Optional / additional Processing • P-S wave DMO with N offset planes. QC products. • Higher order non-hyperbolic NMO corrections. QC products. • Trim statics. QC products. • FD Migration with PS average velocities (2*VpVs/(Vp+Vs)). QC products. • Generation of SPS. • Computation of velocities from raw uphole data and building of static model. • Noise attenuation. The contractor is asked to propose available suited techniques • and to provide technical details. COMPANY will choose the method to be applied. • 7. Pre-stack Depth Migration

14. 2.2 Key processing techniques for Multi-Component Seismic Data Processing ²Automatic Vp/Vs Picker ²Co-Sensor Interpolation ²Co-Sensor Sum ²Common Conversion Point (CCP) Binning ²Multi-Component Cross-Equalization ²S-Wave 2-Component Rotation ²Vp/Vs Computation ²Vp/Vs Correlation ²Vp/Vs Transform ²P-Sv PSTM ²P-Sv DMO

15. THANK YOU!