Seismic data processing

Processing of field seismic gathers


Software and hardware basis of the Processing Department
The core software running by the U.B.Seismic Ukraine Company is based on Paradigm software suite. Echos 2D/3D and GeoDepth 2D/3D modules allow to solve the most complex problems of present-day seismic prospecting.
The use of programmed parallel computation technology significantly speeds up computation processes.
An important feature of Paradigm suite is full compatibility among processing, interpretation and imaging systems within Paradigm software environment. Thus in the process of departments interaction and data transferring the risks of human errors are reduced to minimum.
Hardware symbiosis of personal stations, cluster system, archival storages and high-speed LAN enables on the fly tasks execution and quality control due to parallel computing, especially for migration transformations.
Cluster system is consisted of high performance nodes based on state-of-the-art multiprocessor architecture that are linked to RAID with high speed LAN.
RAID array secures solid and reliable performance in any sudden circumstances, and provides complete safety and accessibility of all projects and data.
 
Seismic data processing workflow consists of the following steps:

State-of-the-art technology of amplitude-spatial features preservation is applied on all stages of seismic processing.

 
Datum static correction applying seismic tomography

Special attention is focused on datum statics as it material affects quality and truth of the final processing result. Uphole velocity survey and data on seismic shooting lines are the most precise methods for LVZ analysis. In case of aforementioned data are insufficient, the seismic tomography method is used for datum static correction.

 

Coherent and random noise suppression (LIFT-technology)
LIFT technology is actively used for random, coherent and microseismic noise supression.
To increase signal to noise ratio in common shot gathers LIFT technology can be used several times.


Data upscaling (surface-consisted deconvolution)
In order to stabilize spectral composition and waveform of seismic data, frequency range expansion and frequency compensation for near-surface shooting and acquisition conditions heterogeneity, surface-consisted deconvolution is applied.
Seismic signal surface-consistent balancing allows further processing with so called “initial” amplitudes preservation without using of automatic gain.

 

Frequency spectrum balancing by field gathers
Frequency spectrum balancing leads to an increase of seismic record resolution that grants significant advantage in course of thin-layered seismic modeling.

 
RUST technology application (removal of static long-wavelength component influence)
On first steps of seismic processing workflow, RUST technology application for datum static correction leads to accuracy enhancement and reducing of an influence of static long-wavelength component, as it could not be compensated on further steps of static correction.

 

Post-stack and pre-stack migration transformations
Usage of pre-stack migration transformations allows obtaining of more precise and “true” seismic imaging in contrast with post-stack migration.
Performing pre-stack migration is especially relevant in salt tectonic conditions.

 
3D depth-velocity modeling
Realization of pre-stack migration in depth domain allows reaching a new quality level in seismic modeling. An important part of this process is to build detailed volumetric depth-velocity model. At this stage well data and interpretation results are used, also an interpreter’s support is compulsory.



«Example of pre-stack migration in time and depth domain (time scale)»

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