Abstract

The Pekisko Fm. in the Sylvan lake area is a fractured carbonate where routinely measured Kmax and porosity show a poor correlation when cross plotted. Even more difficult is the task of relating permeability to porosity between log data and core data when fracturing, either induced or natural, is involved.

Using profile permeameter data and biasing the profile permeameter measurements to the rock matrix, instead of the many fractures, presented a much better fit of core permeability to core porosity. The improved correlation resulted in a new permeability transform that was used on subsequent wells to accurately predict permeability from logs - to the extent that further coring may not be necessary.

The Glauconite Fm. in the Halkirk area is horizontally drilled and is not routinely cored, and as a result, geoscientists and engineers often do not take advantage of analytical techniques available. Despite this, horizontal wells are usually drilled in developed fields where good core coverage exists. This provides an opportunity to re-evaluate pre-existing cores for detailed analysis.

Although the Glauconite Fm. in horizontal wells is not usually logged, gamma ray devices are frequently run in conjunction with MWD tools. Transforms can be developed between the MWD gamma response and permeability from existing offset cores.

Routine core analysis provides permeability at discrete intervals, which may create uncertainties when developing regression models from continuous logs. This statistical problem can be eliminated by using high resolution permeability logging. This new technique provides continuous, log-profile data, which was utilized to create a more accurate horizontal permeability model.