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Application of Kriging to the Mapping of a Reef from Wireline Logs and Seismic Data; A Case History

  • Laurent Moinard
Part of the Quantitative Geology and Geostatistics book series (QGAG, volume 2)

Abstract

Maps constructed from seismic data represent subsurface structures in terms of two-way transit time. Wireline logs provide depth of formation tops at well locations. The best representation of a subsurface horizon should combine both measurements. Kriging is an ideal tool for merging seismic and log data.

This case history describes the mapping of a reef in north Texas. Seismic data include three common depth point (CDP) lines and a large number of single-fold records. Wireline logs, including a vertical seismic profile (VSP), are available in 11 wells.

The first step is the geostatistical analysis of seismic data. The empirical semivariogram is drawn from several hundred shot points, and a theoretical model is fitted. This semivariogram is used to construct a time grid.

In the second step, wireline logs are correlated to the seismic sections with the help of the VSP data. A time-depth relationship is established and applied to the time grid to yield a “drift” for the kriging of the depth data. The final output is a depth grid used to generate a contour map.

Keywords

Seismic Data Seismic Section Seismic Line Geostatistical Analysis Hydrogen Index 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. P. Delfiner, J.P. Delhomme, and J. Pelissier-Combescure: “Application of Geostatistical Analysis to the Evaluation of Petroleum Reservoirs with Well Logs,” paper presented at the 1983 SPWLA Annual Logging Symposium, June 27–30.Google Scholar
  2. Milton B. Dobrin: “Introduction to Geophysical Prospecting,” McGraw Hill, 1976.Google Scholar
  3. Bob A. Hardage: “Vertical Seismic Profiling,” Geophysical Press, 1983.Google Scholar

Copyright information

© D. Reidel Publishing Company, Dordrecht, Holland 1987

Authors and Affiliations

  • Laurent Moinard
    • 1
  1. 1.Schlumberger Well ServicesUSA

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