Estimation of Clay Types and Volumes from Well Log Data – An Extension of The Global Method


J. A. Quirein, J. L. Baldwin, R. L. Terry
Schlumberger Well Services, M. Hendricks
Energy Reserves Group

8th Formation Evaluation Symposium of the
Canadian Well Logging Society in Calgary, September 27, 28, 29 30, 1981


Fundamental in the quantitative evaluation of shaly formations is the estimation of the bulk volumes of clay, total porosity, and clay bound water. Using clay bound water, total porosity, and salinity, Q v (cation-exchange capacity per unit pore volume) or Swb (bound-water fraction) may be readily obtained, thus enabling determination of water saturation with either the Waxman-Smits or Dual Water saturation equations.