Knowledge Systems has developed a velocity modeling methodology that improves the quality and reliability of seismic data for greater accuracy in subsurface imaging. Knowledge Systems was issued US Patent No. 7,280,918 on October 9, 2007, for methods and systems used to combine seismic data and basin modeling data. The proprietary technology allows development of more precise earth models for the identification of prospects, well planning and drilling operations.


Seismic data quality and reliability varies with depth and spatially across any analysis area due to the presence of salt, surface statics problems, gas chimneys and many other causes, explained James Bridges, chairman and founder of Knowledge Systems. “Salt overhangs or sheets are especially difficult to image properly due to uncertain velocities and ray path dispersion,” Bridges said. “Our patented velocity modeling methodology improves seismic data reliability by fully integrating basin geopressure modeling, geostatistical analysis and seismic reprocessing.” More accurate pressure prediction in areas of poor velocity data quality and improved well placement and target qualification are included among the benefits.


“The sophisticated geologic modeling integrates pore pressure, clay compaction and compartment pressure modeling to produce synthetic velocities and pressure stratigraphy surfaces that better constrain seismic imaging,” said Bridges.


The Knowledge Systems velocity model processing involves creation of an earth model using available well and/or seismic data. Data is calibrated, velocities along significant geologic surfaces are analyzed and the model is then updated.


“The pressures predicted by this updated model are converted to interval velocities and used to guide the reprocessing of the seismic data—which are then used to create an improved depth image,” said Bridges.


As part of a unique velocity modeling service, the process yields several key results, including seismic data calibration to control well data, identification of stratigraphic pressure surfaces using existing velocity data and an improved velocity field to use in reprocessing seismic data as an input to tomographic inversion or data migration. Given that the Knowledge Systems velocity model provides superior results using less computer time, the company intends to license the 7,280,918 patent to the industry at reasonable nondiscriminatory terms.

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