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. Features 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 Attribute-set 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 Curvature Dip Dip angle Position Reference shift SimilarityVolume Statistics SSB SCI MPSI 3D Model builder (Wells and Zones) 2D Error grid Deterministic Inversion Stochastic Inversion Utilities 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