OpendTect یک سیستم نرم افزاری تفسیر لرزه ای برای پردازش، تجسم و تفسیر داده های لرزه نگاری چند حجم و توسعه ابزار های خلاقانه تفسیری می باشد. OpendTect یک بسته تفسیر لرزه ای متن باز است که به طور گسترده ای در صنعت استفاده می شود. OpendTect شامل تمام ابزارهایی است که برای تفسیر لرزه ای دو بعدی و یا سه بعدی مورد نیاز است: دو بعدی و سه بعدی قبل و بعد از پشته، تجسم دو بعدی و سه بعدی، افق و ردیاب های گسل، تجزیه و تحلیل ویژگی ها و تقاطع ها، تجزیه طیفی، تبدیل عمق و غیره. گردش کار تفسیر لرزه ای پیشرفته و منحصر به فرد با استفاده از پلاگین منبع بسته امکان پذیر است که برای همه دانشگاه ها بدون هیچ هزینه ای در دسترس می باشد. این گردش کار شامل تفسیر استراتژی گرا، تجزیه و تحلیل، تجزیه و تحلیل مسیر، تعیین تماس مایع، چرخش قطعی و تصادفی و … است.

 بررسی نرم افزار OpendTect:

OpendTect
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.

2D, 3D, 4D & Prestack
Analyze 2D, 3D, 4D pre- and post-stack seismic data.

Features:

-Interpolate seismic to a new survey geometry
-Simple wedge modeling
-SEGY header manipulation
-3D pre-stack event visualization
-Log math & Rock physics library
-Checkshot and well log editing
-Anisotropic variograms
-And much more!

2D & 3D Viewers
Data processing and visualization are rigorously integrated in the OpendTect system. Visualization elements can be moved freely through data space to interactively analyze data from stored volumes, or data that are calculated on-the-fly.

Volume & Stereo
Volume-rendering, stereo viewing and color blending are supported features.

Seismic Attributes
Numerous attributes and filters, math & logic, attributes from attributes are supported in the industry's most powerful attribute engine.

Spectral Decomposition
Spectral Decomposition is used for imaging and mapping temporal bed thickness and geological discontinuities. Algorithms include FFT and CWT.

Movie-Style Parameter
Attribute parameters (frequency, time gate or step out) can be inspected in a movie-style way, to quickly find the optimal settings for your data.

Distributed Computing
Heavy processing of large volumes can be carried out in batch mode on multiple machines and on multiple platforms that can be accessed through the network. Interpreters can share surveys.

Horizon Tracking
The horizon trackers support manual drawing, line tracking and 3D tracking of amplitudes and similarities. Horizons can be tracked on 2D and on 3D seismic data using the 3D scene and/or 2D viewers.

Faults
Fault planes and fault-sticks sets. Work flows are designed to draw fault sticks, which is very efficient if you work on a Wacom digitizing tablet.

Well-Tie
The synthetic to seismic well-tie module enables the interpreter to tie wells to seismic:

-Synthetic seismogram
-Check-shot correction
-Additional stretch & squeeze
-Updated depth/time model
-Statistical wavelet extraction
-Deterministic wavelet extraction.

Time to Depth conversion
Use an existing velocity model, or create one with the new Volume Builder. Supports: on-the-fly TD conversion of display elements and batch processing of volumes.

Geobodies
Insert an iso-surface in a volume rendered cube and save it as a geobody. Manually draw 3D bodies.

Madagascar Processing
OpendTect has a generic user interface to Madagascar, the open-source software package for geophysical data processing and reproducible numerical experiments.

GMT Mapping
Via the link to the open-source GMT package you can create within the OpendTect UI scaled maps of OpendTect results.

Gap Decon
A multiple removal tool through prediction error filtering. Auto-loaded in OpendTect base. (Sponsored by Addax).

Horizon Attribute
The Horizon attribute allows surface (horizon) data to be combined with cube data for calculations. Auto-loaded in OpendTect base.

Annotations
Annotate seismic data with text-boxes, hyperlinks, (lap-out) arrows, and images. Auto-loaded in OpendTect base. (Developed as part of OpendTect SSIS; sponsored by Shell, BG-group, Statoil, TNO).

MatchDelta
Trace cross-equalization functionality that is used to correct small misalignments in 3D seismic volumes prior to further analysis. It is typically used to align time-lapse seismic data, multi-azimuth stacks or angle stacks (Residual NMO correction). Auto-loaded in OpendTect base.

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.
For an overview of the OpendTect Attributes please take a look at the Attributes Table.

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
Similarity - Attribute that returns trace-to-trace similarity properties
Spectral decomposition - Attribute that returns the amplitude spectrum (FFT) or waveletcoefficients (CWT)
Volume statistics - Attribute that returns statistical properties.

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