Three Dimensional Visualization Of Geostatistical Models In The McElroy Field Of West Texas

Leon M. Roe

The 3-D visualizations of geostatistical models have proved useful in identifying stratigraphic variations that affect oil production in the McElroy field of west Texas. Traditionally these models have been viewed using vertical and horizontal slices but by viewing the model in "3-D" subtle, and not so subtle, features related to the stratigraphic complexity of the reservoir are much more apparent. Even those of us who claim that we can "think in three dimensions" have been surprised at how much more we can "see" when we are presented with a 3-D projection or stereo image of the reservoir.

"Three dimensional" visualization has been a very valuable tool in communicating geologic concepts and models to multidisciplinary teams. We have found it much easier for non-earth scientists to understand geologic models, or even to question the validity of the models, when using these displays. When well bore information, such as injectivity profiles, is added to the model a better understanding of fluid flow, including fluid cycling pathways, and the dynamics within the reservoir can be developed. This information can be used to realign wells to take advantage of variations in subtle changes in geology or to identify potential areas of by-passed oil that can be targeted by horizontal wells.

AAPG Search and Discover Article #91019©1996 AAPG Convention and Exhibition 19-22 May 1996, San Diego, California