Reflectivity (Stack & Gather)

Description Generate reflectivity or gather reflectivity.
Module(s) Quantitative Interpretation, Explorationist *
Works with Stack, Gathers

* This process is made available in the Explorationist module temporarily.

Calculate reflectivity (at an angle) and AVA terms from elastic logs.

  1. In the Control Panel, go to View > New Single Well View.
  2. In the Single Well window, open the Process tab.
  3. At the tab header, click the blue "+" icon.
  4. Click on Reflectivity.
  5. Type a name for the process and click OK.

Configure reflectivity

  1. Input: Select a P-Velocity, S-Velocity and Density curve.
  2. Missing/Invalid Values: Choose the action when input variables are unavailable, null or invalid prior to filtering. This rule is applied when calculating each sample:
    • Interpolate (default): Calculate missing Vp values using the class interpolator.
    • Output 0: Replace missing Vp values with 0.        
    • Output Null: Replace missing Vp values with Null.
  3. Click the blue "+" icon to add a row and red "x" icon to remove the row.
    • Click and drag the dotted area on the left of the name to change the row order.
  4. Name: Type a name for the angle.
  5. Angle: calculate the reflectivity at this angle.
  6. Result curves are calculated for enabled items:
    • Angle Stack Reflectivity (rfc): The reflectivity at the specified angle.
    • AI, SI, Density, Vp/Vs Reflectivity: Reflectivity for each property is calculated as where P1 and P2 are consecutive samples.
    • Intercept, Gradient, Curvature: AVA properties at each sample.
  7. Enable custom name:  Allow the user to define the process output curve name.
  8. Prefix: Text appended to the name of each output curve.
  9. Extent: Output is always in TWT.
    • Enter the start, stop and step size.
    • Reset: set the start, stop and step size to match the available data in TWT