The accuracy of the log analysis with the use of Computer Processed Interpretation (CPI) in shaly sand, depends mainly on the proper selection of the type of equation (interrelation of S
w, φ, R
t, V
cl…) and the values of the parameters to be used therein.
Therefore, prior to starting the analysis, it is most desirable to establish the equation which is adequate for the local geological conditions. However, voluminous data and many hours will be required for such purpose.
In the case of the Agaoki oil and gas field, from the study of well log data and test results of wild cat wells, it was concluded that actually, satisfactory results could be obtained by the use of properly controlled Cementation Factor m, and Saturation exponent n.
In actual well log analysis of development wells, satisfactory results have been obtained by using values of m=2.3 and n=1.4.
Originally these parametric values were, empirically decided to compensate the difference between the results derived from log interpretation and results from core and production tests.
These values have been also supported by a method of studying logical papmeters through log data, which is a method newly developed in this field, using log derived values only. (To be continued)
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