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De-noising Vibroseis The contention is that the correlated Vibroseis field record (to the far left) is a mess of overlapping coherent noise and signal, the noise being strong enough to control the stack. On first glance, one would think there is a serious statics problem, but once the non-linear process lifts off most of the noise (to the right), we see that statics are not involved. No event shifting was used so the resolution of this jaggedness proves the presence of the noise, as well as the removal effectiveness.. The operative target is below the red line. The goal is delineation of a series of coal beds. As you will see when you continue through the 14 adjacent points, the logic was consistent on its very selective event selection. Note here how it took out the leading lobes just below the red line and then emphasized the ones just below. Once again, the initial jaggedness was the result of the intricate overlay of noise and signal, and eliminating that phenomenon is the essential proof of the logic. The fact that what comes out exhibits the proper event shape is the final verification, since we are not smart enough to force that result. This is a timed show, so relax and pay attention to the detail. Clicking will speed it of course.

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Allow them time to load! A PowerPoint compendium of seismic topics. ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Basic reflection theory the experts seemed to have missed. Inversion and integration the all important sonic log simulation. Coherent noise background an explanation of types. Removal of coherent noise on Gulf Coast a breakthrough. Vibroseis de-noising another (but similar) breakthrough. Strike slip faulting salt dome association new thinking. North Sea strike slip interpretation the importance of resolution. About Paige - MS in geology,spent 7 years in Venezuela for Mobil,& then Phillips Maracaibo interpretation found Phillips major field there. Back to states, joined Phillips computing, became project manager for exploration. Hired by Western Geo. To start digital operations in Shreveport. Wrote first predictive deconvolution program that put Western on the map in digital processing (and formed the non-linear basis for later ADAPS software), After brief sojourn in commercial processing (where he wrote a table driven programming system), joined Dresser Olympic as both manager of processing and of research. Went on his own to start non=linear development. Consulting package consists of Paiges personal time, his open-ended software and use of his processing hardware. Unless full segy detail is requested (segy output), the product is a series of PowerPoint studies. He can be reached at dpaige1@sbcglobal.netdpaige1@sbcglobal.net Click on this oval to return to noise symposium router or, alternatively see options below.