Visualizing Prestack and Multi-Component Data in OpendTect OpendTect Master Class June 15, 2014

Outline Introduction Prestack Visualization In 3D scene In 2D Panel Display Gathers Display Mute, Display Angle Gathers Multi-Component Visualization Evaluation of Multi-Component Data Example: Spectral Decomposition Cube

Introduction This presentation will first cover the visualization of prestack data in OpendTect and continue with a method for viewing (and evaluating) multi-component data. The steps for each method will be covered. Requirements: Sufficient RAM (8+GB) and a good graphics card (1+GB)

Introduction License Requirements Prestack Visualization No additional license required In 3D scene In 2D Panel Display Gathers Display Mute, Display Angle Gathers Multi-Component Visualization No additional license required Evaluation of Multi-Component Data Example: Spectral Decomposition Cube

Outline Introduction Prestack Visualization In 3D scene In 2D Panel Display Gathers Display Mute, Display Angle Gathers Multi-Component Visualization Evaluation of Multi-Component Data Example: Spectral Decomposition Cube

Prestack Visualization (3D Scene) Using the Penobscot dataset (available on the OSR) Load an inline (or crossline) and right-click on the data displayed in the scene in order to load the prestack which is displayed in the crossline direction

Prestack Visualization (3D Scene) The positions pop-up allows you to step along the inline in user-defined steps or enter the crossline number directly. Alternatively, you can drag the prestack directly to reposition and the data is displayed on release:

Outline Introduction Prestack Visualization In 3D scene In 2D Panel Display Gathers Display Mute, Display Angle Gathers Multi-Component Visualization Evaluation of Multi-Component Data Example: Spectral Decomposition Cube

Prestack Visualization (2D Panel) The prestack data may also be displayed in the 2D Viewer (right-click on the prestack in the scene):

Prestack Visualization (2D Panel) The ‘Set Positions’ icon allows you to change the ranges and step (therefore the number of gathers displayed):

Prestack Visualization (2D Panel) The ‘Set Gather Data’ icon allows for selection of multiple gathers:

Prestack Visualization (2D Panel) The ‘Set seismic display properties’ icon gives display options for individual gathers:

Outline Introduction Prestack Visualization In 3D scene In 2D Panel Display Gathers Display Mute, Display Angle Gathers Multi-Component Visualization Evaluation of Multi-Component Data Example: Spectral Decomposition Cube

Prestack Visualization (2D Panel) Clicking on the ‘Pre-processing’ icon allows the following options:

Prestack Visualization (2D Panel) You may load and display mute functions:

Prestack Visualization (2D Panel) Angle data may be displayed:

Outline Introduction Prestack Visualization In 3D scene In 2D Panel Display Gathers Display Mute, Display Angle Gathers Multi-Component Visualization Evaluation of Multi-Component Data Example: Spectral Decomposition Cube

Multi-Component Visualization Using the Spectral Decomposition attribute as an example, we will demonstrate how it’s possible to create a multi-component cube. It is still quite cumbersome in v4.6, but in v5.0 this process will be enhanced and made more user-friendly. The general idea (v4.6) is that one creates a ‘pseudo-prestack’ cube using the ‘Create multi-cube pre-stack data store’ feature (located via the ‘Manage 3D Prestack Seismics’ window).

Multi-Component Visualization The frequency components of Spectral Decomposition are each assigned a ‘pseudo-offset’ value as the cube is constructed

Multi-Component Visualization It may be useful to label your frequencies with ‘appropriate pseudo-offsets’ (ie: 4Hz-400m, 8Hz-800m, etc.)