Field Case Study: High-Frequency FWI on Viking Graben Line 12

Key Study Highlights

We successfully applied 35Hz Full Waveform Inversion (FWI) and Least-Squares RTM to the benchmark Viking Graben Line 12 dataset - the North Sea’s classic test profile.

Acquisition Parameters

• 🔹 Streamer length: 3 km
• 🔹 Profile length: 28.75 km
• 🔹 Model depth: 4 km
• 🔹 3 validation wells (Well 4, 5, 7)

Breakthrough Results with High-Frequency FWI

Enhanced Velocity Model Resolution

• 🔹 Refractions improved shallow section (355-800m)
• 🔹 Reflections sharpened fault imaging (LSRTM section)
• 🔹 Achieved industry-leading 35Hz inversion frequency

Well Data Validation

• 🔹 Sonic logs confirmed FWI accuracy
• 🔹 Excellent model match at 1600-2500m (Well 4)
• 🔹 VSP data used for initial model building

⚠️ No sonic data available at 0-1000m

Tangible Business Value

• ✅ Reduced drilling risks for offshore operations
• ✅ Improved thin-bed detection capability
• ✅ Ready-to-deploy methodology for North Sea analogs