PyVelan

Tool for velocity analysis of 2D seismic data using semblance analysis and interactive picking.

Description

PyVelan performs velocity analysis of seismic data:

• Load SEG-Y files
• Navigate between CDPs with navigation buttons
• Automatic semblance calculation with real-time recalculation
• Interactive velocity picking
• Automatic smoothing and NMO correction
• Save and export results

Installation and Running

Requirements

• Python 3.8+
• PyQt5
• matplotlib
• numpy
• scipy
• segyio

Install dependencies

pip install -r requirements.txt

Run

python pyvelan.py

Usage

1. Open SEG-Y file via File → Open
2. Navigate between CDPs using "<" and ">" buttons or select from dropdown
3. Adjust analysis parameters (Vmin, Vmax, Vstep, threshold) - semblance recalculates automatically
4. Use Autopick for automatic picking or add picks manually
5. Save results via Save CDP or File → Save

Features

• CDP Navigation: Use "<" and ">" buttons to move between CDPs
• Real-time Recalculation: Semblance updates automatically when changing velocity parameters
• Interactive Picking: Click to add, drag to move, right-click to delete velocity picks
• Data Protection: Program prompts to save results when closing or opening new files
• Smooth Workflow: 500ms delay prevents excessive recalculations during parameter adjustment

Author

Sergei Sergeev - https://sergeevsergei.ru