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A Brief Introduction For Multi-Component Seismic Data Processing.

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Presentation on theme: "A Brief Introduction For Multi-Component Seismic Data Processing."— Presentation transcript:

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2 A Brief Introduction For Multi-Component Seismic Data Processing

3 Integrated Techniques Z component processing Statics Pre-stack noise attenuation Surface consistent processing Velocity analysis, NMO, stack Imaging X,Y component processing S wave statics CCP binning P-SV velocity analysis P-SV wave NMO P-SV wave imaging Extraction of attributes 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. 1. Introduction

4 before after S-wave Statics

5 Conventional NMO Non-hyperbolic NMO Super gather PSV NMO

6 P-P PSV Final processing results

7 Lithology prediction using Vp/Vs ratio Gas-bearing sandstone

8 2. Multi-Component Seismic Data Processing 2.1 The 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 

9 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 

10 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

11 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 

12 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  1 st Surface Consistent Residual statics Correction  Predictive Deconvolution or Inverse Qs-filter  2 nd velocity analysis (every 250m) and stack  2 nd Surface Consistent Residual statics Correction  Offset separation (positive and negative offsets) prior to PSTM  Kirchhoff Pre-stack Time Migration 

13 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

14 2.1.3 Optional / additional Processing 1.P-S wave DMO with N offset planes. QC products. 2.Higher order non-hyperbolic NMO corrections. QC products. 3.Trim statics. QC products. 4.FD Migration with PS average velocities (2*VpVs/(Vp+Vs)). QC products. 5.Generation of SPS. 6.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

15 2.2 Key processing techniques for Multi-Component Seismic Data Processing ² Automatic Vp/Vs Picker ² Co-Sensor Interpolation ² Co-Sensor Sum ² Common Conversion Point (CCP) Binning ² Multi-Component Cross-Equalization ² S-Wave 2-Component Rotation ² Vp/Vs Computation ² Vp/Vs Correlation ² Vp/Vs Transform ² P-Sv PSTM ² P-Sv DMO

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