Attributes & Processing

Home

Attributes are important in seismic interpretation for two reasons: they reveal geological information that may otherwise remain hidden and they allow the extraction of relevant information for integration purposes. All modern seismic interpretation systems offer some form of attribute analysis but we firmly believe that OpendTect™s way of interactive attribute analysis is superior to any competitive product.

OpendTect Attributes Matrix

Publications...

OpendTect Plugins

Attribute analysis requires a geologic mind and a system that supports multi-volume, interactive analysis. That is what OpendTect is all about! You zoom in on your target. You calculate attributes on-the-fly. You test attribute parameters in movie-style fashion. You calculate attributes from attributes. You create your own attributes and filters using math and logic. In other words: the total number of attributes in OpendTect is unlimited. This gives you total freedom to use your full expertise.
The commercial plugins to OpendTect give you even more power:

Seismic Attributes

Dip-Steering

Dip-Steering is used to improve multi-trace attributes by extracting attribute inputs along reflectors (e.g. dip-steered similarity) and to calculate unique attributes, such as dip & azimuth, volume-curvature, and variance of
the dip.

Neural Networks

Neural Networks are used to combine multiple attributes into meta-attributes for object detection such as chimneys or faults. Neural networks are also used for pattern recognition for seismic facies volumes and horizon-based waveform segmentation. Another application of Neural Networks is the inversion to porosity, Vshale, Sw along well tracks.

CCB

CCB (Common Contour Binning) stacks seismic traces along horizon contour lines to highlight subtle hydrocarbon-related seismic anomalies and to accurately pin-point Gas-Water, Gas-Oil and Oil-Water contacts.

SSB

SSB (Seismic Spectral Blueing) plugin is a technique to optimize the vertical resolution of seismic data by shaping the seismic spectrum without boosting
noise.

Dip Steering

Dip steering is also used for structurally-oriented filters to remove random noise (e.g. dip-steered median filter) and/or to sharpen fault edges (e.g. Fault
Enhancement Filter)

Madagascar

OpendTect features a connection to Madagascar, the Open Source seismic processing package. The
processing flow builder of OpendTect enables the user to construct and execute Madagascar processing jobs. Processing flows can start from 2D and 3D pre- and post-stack data in either Madagascar or OpendTect format. Likewise results can be saved in both formats. Data stored in OpendTect format can be further analyzed in OpendTect.

Velocity Model Building

The VMB plugin is used for picking RMO velocities from pre-stack Common Image Gathers. RMO velocities are used to update the (3D) velocity model in PSDM work flows. VMB supports picking on semblance gathers and picking of pre-stack events for input to the PSDM-Tomographic plugin. Two VMB modules are supported: vertical update and horizon-consistent update. The actual creation of velocity models is performed in OpendTect Base. Models are constructed from combinations of gridded / smoothed RMO velocities, interval velocities and 3D body velocities.

VMB is designed to support multiple PSDM systems. All structures needed to interface a PSDM system to OpendTect VMB are released in the Open Source domain.

Try & Buy

PSDM Kirchhoff

PSDM Kirchhoff migrates pre-stack Common Image Gathers in depth with a Kirchhoff migration algorithm. Outputs are PSDM migrated gathers and/or stacked volumes. Travel time tables are computed by 3D ray-tracing through the OpendTect supplied velocity model. PSDM Kirchhoff comes with a job-deck builder and a subset of the Ethos processing system, which is Geokinetics proprietary seismic processing system.

Try & Buy

PSDM Tomography

PSDM Tomography is a grid-based tomographic velocity update module. Inputs are a velocity model and picked pre-stack events from OpendTect - VMB. Output is the updated velocity model. The distribution of errors is controlled by the user via a quality volume that specifies the allowed variations. PSDM Tomography comes with the same intuitive job-deck builder as PSDM Kirchhoff and a subset of the Ethos processing system, which is Geokinetics proprietary seismic processing system.

Try & Buy

Software Requirements: see this Matrix

Services

dGB conducts exclusive, tailor made studies on behalf of international E&P companies. Studies typically involve integration of geological knowledge, well data and 3D seismic data, for which we use our GDI and OpendTect software as well as 3rd party software products. The study objectives may vary from regional exploration (object detection, fluid migration history, sequence stratigraphy) to qualitative and quantitative interpretations to support understanding of reservoir distributions and properties.

dGB Earth Sciences

Nijverheidstraat 11-2 - 7511 JM Enschede - The Netherlands - Tel. +31 (0)53 431 51 55 - Fax. +31 (0)53 431 51 04

1 Sugar Creek Center Boulevard, Suite 935 - Sugar Land, TX, 77478 - USA - Tel. +1 281 240 3939 - Fax. +1 281 240 3944

310, Gateway Plaza, Hiranandani Gardens - Powai, Mumbai 400 076 - India - Tel. +91 22 25704984 - Fax +91 22 25704977