--> Abstract: Pre-drill Risk Assessment and Post-drill Results, Corallita and Lantana Discoveries, Columbus Basin, Offshore Trinidad, by L. P. Kinslow, E. L. Frantz, and G. E. McMaster; #90942 (1997).
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Abstract: Pre-Previous HitdrillNext Hit Risk Assessment and Post-Previous HitdrillNext Hit Results, Corallita and Lantana Discoveries, Columbus Basin, Offshore Trinidad

KINSLOW, LINDA P., ERIKA L. FRANTZ, and GLENN E. MCMASTER

The Corallita and Lantana wells were two of the seven discovery wells drilled offshore Trinidad in Amoco's very successful, eight well Exploratory Drilling Program in 1995-1996. Together, the Corallita and Lantana wells discovered over 1.5 TCF of gas in 10 pay intervals (out of 16 horizons risked). Early risk analysis indicated that fault seal and trap definition were the two largest risk factors for these prospects.

To help assess trap definition risk, 3D Seismic was acquired and processed in mid-1995. Amoco's proprietary 3D Coherency technology was applied, in conjunction with conventional amplitude analysis, to estimate the most likely column heights and areal extent of the reservoirs. Historical column height data and sand thicknesses within the basin were also used to help predict trap volumes. Fault seal risk was rigorously assessed using FAPS, a commercial software package. For every potential reservoir section, the juxtaposing relationships across relevant faults and the amount of shale smear were analyzed. This information, combined with historical knowledge, was used to independently risk all potential reservoir sections. The individual risk runs were combined in Amoco's proprietary stacked pay risk model to determine the overall chance of success and resource distributions for each well.

Post-Previous HitdrillTop assessment of these wells indicates that we accurately identified and risked the primary failure modes prior to drilling. In terms of resource prediction, both wells discovered resources within the simulated outcomes. In Corallita we discovered ~125% of the mean economic resources predicted and in Lantana we found roughly 80% of the predicted resources.

AAPG Search and Discovery Article #90942©1997 AAPG International Conference and Exhibition, Vienna, Austria