Seismic Data Processing Workflow and Software Use

Jun 7, 2024

Seismic Data Processing Workflow and Software Use

Introduction

  • Topic: Seismic data processing workflow using specific software.
  • Previous Lecture: Discussed seismic data acquisition processing flows and provided field data examples.
  • Today's Focus: Reflection data processing using software and cyber data processing.

Software Use Introduction

  • Tutorial: Following Tutorial A (2D processing).
  • File Details: Data named '20 short line', stored in directory 'tutorial a' under processing software directory.
  • Input File: '20 short 20 cmb' (compacted data).
    • Provided SEG-Y file to avoid decompression.
  • Provided Workflows: S20 velocity analysis, S20 sequential flow, simple scaling, shortcut 107 or 08, and root stack with 2D reflection static.

Main Sections in Lab

  1. Initialization of the Project
  2. Command and Flow Window processing
  3. Directory Window, Hand Equations, Header Equations, Seismic Window Display
  4. Plot Control and Header View
  5. Reflection Starting

Initialization of the Project

  1. Starting the Software
    • Access processing software folder and double-click to start.
  2. Defining New Project
    • Create project folder: test2.
    • Define project title: Processing Lab, 20 short line, Location: Malaysia.
    • Project Type: 2D survey, Unit: meter.
  3. Loading Seismic Data
    • Add seismic data under Tutorial A, displaying headers and trace details.
    • Data Characteristics: Start time 0, 1000 samples, 2ms sampling rate, 2400 traces.

Command and Flow Window

  • Accessing Windows:
    • Job Flow, Western Command Windows (input, output, create data, geometry, etc.).
    • Scaling, filtering, resampling, deconvolution commands.
  • Vista Dictionary:
    • Change header formats.
    • Examples: Modify header equations, byte location changes.

Plot Control

  • Display Options:
    • Variable density/area, view modifications.
  • Annotation Parameters:
    • Display header information (short point number, channel number).
  • Interactive Tools:
    • Trace scale, reverse polarity, muting, first break picking.

Interactive Features

  1. Trace Kill
    • Reboot traces affected by noise.
  2. Reverse Polarity
    • Correct reverse polarity issues in seismic data.
  3. Muting
    • Top mute, bottom mute, surgical mute.
  4. First Break Picking
    • Manual/auto first break detection.
  5. Time Gate
    • Create time windows for specific deconvolution of data.

Seismic Header View

  • View/Edit Headers:
    • Plot headers against data dimensions.

Practical Application: Reflection Static

  1. First Break Picking and Reflection Static
    • Pick first breaks using reflection static window.
    • Process raw and stacked data, save static values.
    • Apply static values to recompute results with/without static adjustment.

Conclusion

  • Introduced software for reflection data processing.
  • Demonstrated initialization, data loading, interactive tools, and first break picking.
  • Practical reflection static lab assignment provided for further practice.

Full transcript