Lecture 16_Generate Vel the other hand Model.pptx

When all the fluid pumped downhole returns to the surface

1. Generating a Simple Velocity Model Intercept Time Method and Plus Minus Method

2. Introduction Why? Simple velocity model is required to As a fast tool in the field to check the subsurface geology Can be used to generate initial models for more complex techniques How? Simple velocity models are generated using methods based on simple algebra Advantage Easy and fast to calculate in the field using a pocket calculator Disadvantage Generated model are too simple

3. Procedure Field data acquisition Filter recorded data (if required) Display recorded data Pick first arrival traveltimes Calculate velocities and depths

4. Intercept Time Method Reciprocal Time Reciprocal Time Cross Over Distance Cross Over Distance Intercept Time Intercept Time

5. Intercept Time Method Reciprocal Time Reciprocal Time Intercept Time Intercept Time         Velocity Calculations = 438 m/s = 301 m/s Same for Intercept Times Depth Calculations  

6. Intercept Time Method 0.0 5.0 10.0 15.0 20.0 Depth (m) Layer 1   Layer 2