Formation Factor Values in Western Canada Reservoirs


W.D.M. Smith, Dresser Industries Canada Ltd


Formation factor values are calculated from well logs and compared to available lab data and the Archie equation. Reasonably good agree- ment is found in sandstones and wherever carbonate lab samples have been subjected to pressure. The effects of overburden pressure on log derived formation factors is apparent on a group of coarse vugular dolomites found at various depths. Log derived formation factors are probably more realistic than lab data where high pres- sures are present insitu.