SEISMIC SCANNING

The scanning of seismic sections is a cost-effective method of converting hard-copy seismic data into digital form. With good prints the quality achieved is very close to the original, and even with poor prints the resulting data can make interpretation much easier. In cases where the original field tapes have been lost or have become unreadable, seismic scanning is the only option available for producing digital seismic data.

Details of the scanning process

We offer two different services depending upon the quality of the prints supplied: REDEEM and REDEEM PLUS. On old prints where only the peaks are displayed REDEEM can still turn the section into useable data. Our technique interpolates the troughs between peaks to reconstruct the full waveform for each trace. This technique can also be applied to poor quality prints where the troughs are not easily discernible. REDEEM PLUS uses the full waveform, and consequently matches the original digital data very closely. Using this technique with good quality prints provides data approaching the quality of that found on the original tapes.

Our scanning software incorporates additional features to correct small flaws in the prints. CLEAN is a proprietary process built into the REDEEM sequence. This enhances lateral continuity based on frequency-dependent criteria, while preserving legitimate discontinuities such as faults. Interpretation marks on the section can be removed using our software, without altering the original prints. A very sophisticated technique is used to realign distorted or poorly spliced sections. The distortion in both space and time is corrected through analysis of the data. The zero crossing of individual traces is detected in a time-variant manner so that bent traces can be straightened. Timing lines are automatically detected and repositioned correctly if distortion is present. The result is that the data will always appear at its correct time.

Migration or other post-stack processing can be applied to the sections after scanning if required. The digital data is output in SEG-Y format, so that it can be exported directly onto a workstation for interpretation.

Preview REDEEM on-line

The REDEEM process can be evaluated on-line by comparing the trace patterns prior to scanning and after processing. This is done using an interactive previewer which allows you to zoom in. In an attempt to keep download times reasonably quick, the images will appear pixellated when zoomed in close. This does not represent the quality of either the scanned section or the processed SEGY data. It should also be noted that the match between the scanned and processed sections is not 100% accurate. This is a limitation of seismic scanning in general. To our knowledge REDEEM PLUS is the best solution available for the scanning of troughs. It can be seen from the preview that the troughs are more often than not conveyed correctly.

Preview REDEEM

N.B. To run the previewing application requires at least Microsoft Internet Explorer 4 or Netscape Navigator 4. Due to the differences in the way the two browsers work, the preview performs better under Internet Explorer. Users of Netscape might experience some problems with drag and drop and display problems if the window is resized. Apologies to users of older browsers, but since the most up to date versions are available for download free, it seems silly to maintain backwards compatibility. Whilst every effort has been made to restrict the download times of the images, it may take several minutes for the previewer to completely download. Please be patient - it's worth the wait!