RE: New contract28 Aug 2025 09:32
Analyzing Ocean Bottom Node (OBN) seismic data is a multi-stage process that can take several months to over a year, depending on the complexity and goals of the project.
⏱️ Typical Analysis Timeframes
Survey Size / Complexity
Time to Analyze (Approx.)
Small / Simple survey
3–6 months
Medium (e.g., 300–500 km²)
6–9 months
Large or complex (e.g., subsalt, deep water)
9–18 months
🔄 What Happens During Analysis?
1. Data QC & Pre-Processing
• Time: 2–6 weeks
• Tasks: Check data quality, apply filters, correct for timing, sensor calibration, etc.
2. Velocity Model Building
• Time: 1–3 months
• Create an accurate earth model to simulate how seismic waves travel underground.
3. Imaging (Migration)
• Time: 1–4 months
• Convert seismic reflections into 3D images using algorithms (like RTM – Reverse Time Migration).
4. Amplitude and Attribute Analysis (AVO, Inversion, etc.)
• Time: 1–2 months
• Analyze rock and fluid properties (helps identify hydrocarbons).
5. Interpretation
• Time: 1–3+ months
• Geoscientists interpret the data to identify potential oil/gas reservoirs.
6. Reprocessing or Iterations (if needed)
• May add weeks or months, especially if the initial model needs updates.
📌 Key Factors That Affect Analysis Time
• Geological complexity (e.g., subsalt, faulted zones)
• Data volume (OBN data is often huge due to full-azimuth, long-offset recordings)
• Computing power available (high-performance computing is critical)
• Analysis objectives (basic imaging vs. reservoir characterization)
🧠 Summary
• Minimum: ~3–6 months for straightforward projects
• Typical: ~6–12 months for most commercial OBN surveys
• Complex cases: Up to 18+ months, especially in deep water or subsalt areas
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