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.KeywordsSeismic DataSeismic SectionSeismic LineGeostatistical AnalysisHydrogen IndexThese 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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