The reservoir in this study is a massive turbidite in the Gulf of Mexico. A very generalized north-south cross-section (Figure 1) shows the three wells used in this study. Of particular importance are (1) the 2530 ft (TVD) between the top of the reservoir and the lower oil-water contact and (2) the perched water table on the south end of the structure. The discovery well (well 1) was drilled with water-based mud. Subsequent wells were drilled with synthetic oil-based mud. The importance of this lies in the variations in well-log response due to differences in invasion and physical...

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