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OpendTect is an open source seismic interpretation software system for processing, visualizing and interpreting multi-volume seismic data, and for fast-track development of innovative interpretation tools. Optionally OpendTect can be extended with (closed source) commercial plugins.


Horizon tracker
The new horizon tracker features various modes:

In auto-track mode the surface grows automatically within a user specified tracking area. The tracker can be controlled by amplitude only, by a step-wise amplitude difference and by similarity (cross-correlation). The stepwise tracker first tracks the areas that have a minimal amplitude difference with the picked seeds and allows for a greater difference in subsequent steps. This results in a much better horizon which requires less editing.
In line tracking mode the user makes an interpretation on inlines and crosslines. On the elements seeds are made and in between seeds an event is tracked or interpolated.
The tracking software supports various features for editing tracked surfaces. Areas can be removed from the surface and re-tracked after picking new seed points, or changing tracking parameters. Holes in the data can be filled automatically with various interpolation algorithm.

Visualizing 2D and 3D seismic data
OpendTect\’s 3D viewer supports visualization of seismic sections (inlines, crosslines, time-slices), random lines, 2D lines, horizons, faults, wells (tracks, markers, stratigraphy, logs), objects, polygons and picks, volume rendering, and pre-stack gathers. Seismic data can also be displayed in separate 2D viewers. Several commercial plugins offer additional visualization capabilities & viewers (e.g. the HorizonCube allows sliding through a dense set of horizons, The Well Correlation Panel (v4.2) supports a dedicated 2D viewer, as does Spectral Bluing and Colored Inversion (v4.2)).

The main idea behind the 3D interface is that seismic interpreters must be able to quickly scan through multiple volumes of data and combine information to get the optimal view of any geological feature of interest. For this reason, data processing and visualization are rigorously integrated in the system.

Visualization elements can be moved freely through data space to interactively analyse data from stored volumes, or data calculated on-the-fly. Visualization elements include slices (inlines, crosslines, timeslices), horizons, random lines and cubes. For better interpretation of the data and analysis results, OpendTect supports volume rendering and stereo viewing.

Seismic Attributes


Various attributes and filters like Energy, Frequency, Similarity, Instantaneous, Band pass filters, Absorption quality factor etc…
Spectral Decomposition with Fourier transforms and Continuous Wavelet transforms
Mathematical and logical expressions to create your own attributes and filters
Movie-style parameter testing ( time gate or step out) to quickly find the optimal settings for your attributes

Attributes List

Convolve — Attribute that returns a filtered response
Delta Resample — Attribute that enables residual alignment of seismic volumes
Energy — Attribute that returns the energy of a trace segment
Event — Attribute that quantifies an event\’s shape or distance relative to a next event
Fingerprint — Attribute that computes the similarity between a user-defined vector of attributes and the equivalent vector taken at each position in a cube.
Frequency — Attribute that returns frequency properties
Frequency Filter — Attribute that returns filtered data using FFT or Butterworth filter types
GapDecon — Attribute that aims to attenuate repetitions of primary reflections (multiples).
Horizon — Attribute that enables advanced calculations on horizons
Instantaneous — Attribute that returns an instantaneous attribute
Match Delta — Attribute that extracts time shifts between similar events in different seismic volumes
Mathematics — Attribute that returns the result of a user-defined mathematical expression
Position — Attribute that returns any attribute calculated at the location where another attribute has its minimum, maximum or median within a small volume.
Prestack attribute — This attribute enables you to load, display, use and manage pre-stack data
Reference — Attribute that returns the definitions of the extraction position
Reference shift — Attribute that moves the extraction position in 3D space
Scaling — Attribute used for scaling of amplitude
SEG-Y checklist — SEG-Y loading checklist
Similarity — Attribute that returns trace-to-trace similarity properties
Spectral decomposition — Attribute that returns the amplitude spectrum (FFT) or waveletcoefficients (CWT)
Velocity Fan Filter — Attribute that returns energy with apparent velocities inside a specified Min/Max range.
Volume statistics — Attribute that returns statistical properties

Plugin – Attributes

Attributes with steering
Dip angle
Reference shift
SimilarityVolume Statistics

3D Model builder (Wells and Zones)
2D Error grid
Deterministic Inversion
Stochastic Inversion

Default attribute sets
Evaluate Attributes
dGB Evaluate Attributes
NN Chimney Cube
NN Fault Cube
NN FaultCube Advanced
NN Salt Cube
NN Slump Cube
Unsupervised Waveform Segmentation
Ridge-Enhancement Filter
Dip-Steered Median Filter
Dip-Steered Diffusion Filter
Fault Enhancement Filter
Fault Enhancement Attributes
Seismic Filters Median-Diffusion-Fault-Enhancement