Numerous successful wells were drilled as the results of applying iDEPTH & iPRIM methodologies. SeisLink velocity packages have proven to be the best "mouse trap" for oil and gas prospects.

• Case 1: Salt Overhang Exploration
• Case 2: Imaging Salt under Geo-pressure
• Case 3: Prospect Risk Assessment
• Case 4: Highly faulted Salt Imaging & Drilling
• Case 5: Sub-Salt Exploration
• Case 6: Low Angle Anticline Depth Migration

Case 1: Salt Overhang Exploration

Software: iDEPTH 3D velocity modeling was the key success factor.

Results: Improved seismic depth imaging of salt overhang, allowed client to drill twenty consecutive successful wells, making this the #1 highest producing asset for this major oil company.

Problem: Prior to coming to SeisLink, client drilled eight consecutive dry holes in a 40 year old oil field and classified it as a depleted asset.

Solution: SeisLink has a track record of finding new plays within old producing oil fields. This is done by combining 3D seismic imaging with iDEPTH software and methodologies. SeisLink received approval from the client to coordinate this effort. Using iDEPTHing, all salt compartments were identified by salt and fault boundaries within 200 feet accuracy. This lead to successful drilling some of the compartments under the salt overhangs for the last eight years and achieved an all-time peak production from this 40-old field.



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Case 2: Imaging Salt under Geo-pressure

Software: iDEPTH 3D velocity modeling was the key success factor.

Results: Two successful wells were drilled as a result of iDEPTH Velocity Modeling (reference: TLE January 2000 - click here to download .pdf file).

Problem: Prior to coming to SeisLink, client had poor image quality due to high pressure pockets near the salt face. As a result seismic data did not tie to well control information.

Solution: SeisLink iDEPTHing included a new geo-statistical algorithm for geo-pressure anomalies was developed for well data integration and subsequent seismic depth imaging. Geo-pressure conditions were included in the velocity model, accommodating velocity anomalies with strong velocity contrasts between geo-pressure zones and surroundings. The integrated high resolution velocity model (left) and smooth velocity model (right) was used for migration results shown.

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Case 3: Prospect Risk Assessment

Software: iDEPTH provides accurate time-to-depth conversion for prospect risk assessment and exploration planning.

Results: SeisLink accurately predicted that the prospect size estimate was significantly smaller based on iDEPTH analysis, and recommended not to drill. The client verified SeisLink's findings by drilling the well.

Problem: Only one well provided checkshot data in a 200-block area for calibration.
Solution: SeisLink used iDEPTHing to derive a 3D time-depth function using exclusive geo-statistical methodologies and the one checkshot for calibration. As you see in average velocity comparison between iDEPTHing (right) and smooth velocity model (left), time-to-depth function can be significantly different.

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Case 4: Highly faulted Salt Imaging & Drilling

Software: iDEPTH 3D velocity modeling was the key success factor.

Results: Improved seismic depth imaging of highly faulted salt area, allowed client to drill two consecutive successful high producing wells.

Problem: Prior to coming to SeisLink, client drilled two consecutive dry holes, based upon a pre-stack depth migration from a major seismic processing vendor.

Solution: iDEPTHing was applied on this on-shore highly faulted salt area to provide accurate velocity models for Curved Ray Pre-Stack Time Migration. The results were remarkably superior in imaging and in well tying. SeisLink then provided a Kirchhoff Pre-Stack Depth Migration, which produced even better results. The following imaging results are the consequence of iDEPTHing. The figures are showing two arbitrary lines with significantly improved imaging. All well markers are calibrated very accurately.

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Case 5: Sub-Salt Exploration

Software: iPRIM residual migration was the key success factor.

Results: Quickly improved seismic depth imaging of area under the salt.

Problem: Prior to using iPRIM, the image under the salt was poor.

Solution: iPRIM, pre-stack residual migration was applied to pre-stack depth migrated data. It provided the best seismic imaging under Zeckstein salt and salt internal reflections from Platten dolomite due to dip-influenced residual moveout equation (see Shot File Migration).

iPRIM provides 3D dip-influenced velocity errors scanning and quality control for residual moveout correction and maximum seismic image focusing .





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Case 6: Low Angle Anticline Depth Migration

Software: iPRIM residual migration was the key success factor.

Results: Quickly improved depth imaging of a low angle anticline in Ecuador.

Problem: Low angle anticlines are very difficult to image correctly, which can hide large reserves or prevent maximizing the reserve potential by drilling in the wrong places.

Solution: iPRIM, pre-stack residual migration was applied to pre-stack depth migrated data. It provided the best seismic imaging.

iPRIM provides 3D dip-influenced velocity errors scanning and quality control for residual moveout correction and maximum seismic image focusing .



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