Donald G. Hill, Ph.D., 

R.Gp., R.G., R.P.G.

Consulting Petrophysicist

"The World is my District"


California Registered Geophysicist No. 170

California Registered Geologist No. 6043

Kentucky Registered Professional Geologist No. 1624

Texas Licensed Professional Geophysicist No. 6289


Accurate Reserves Estimates Require Accurate Petrophysical Models 



The Operator of this reservoir had assumed an Archie saturation exponent of n = 2.0, for reserves estimates.  The above special core laboratory analysis (SCAL) restored net overburden resistively index, I, vs water saturation, Sw, measurements returned a mean Archie saturation index of n = 1.536.  Recomputing the Stock-Tank Original Oil In Place (STOOIP) with the new n value increased the initial reserves estimate by over 30 %.  This recompilation not only increased the value of the reservoir but also increased the maximum daily allowable production rate.

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Contact:  Donald G. Hill at: Cell/Business Phone:  +(925) 437-5748,   FAX:   +(309) 420-7354,   Home Phone:  +(925) 947-1541  


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