... and optimization. Electric logging techniques are commonly used to estimate initial fluid saturations, but may suffer from problems with accurate determination of the log calibration constants for a given reservoir rock, as well as the accurate determination of in-situ water resistivity in some situations...

... on the following relationships: 1 Equation (1) (Available in full paper) Equation (2) (Available in full paper) Equation (3) (Available in full paper) where S w = water saturation, fractional I = resistivity index n = saturation exponent R t = true formation resistivity F = formation resistivity factor...

... radius" of porous rock. log analysis permeability equation reservoir rock shaly reservoir saturation resistivity laboratory measurement permeability capillary pressure well logging contact angle upstream oil & gas interfacial tension capillary pressure data resistivity gradient...

... with a dual-porosity model which allowed estimates of matrix and fracture porosities from logs. Water saturation in matrix and fractures were calculated with the use of a statistical procedure without previous knowledge of water resistivity. In addition, the interpretation led to estimates of bitumen content...

... from which the map was produced contain the values of the top of overpressures obtained from shale resistivity, acoustic and resistivity plots against true vertical depth. The depth to the top of overpressures from the more than 230 wells studied, range from 6,500ft along the shelf, to 15,000ft...

... Abstract A new method is presented for analysis of the nuclear magnetic (NML)resistivity log combination. It is shown that a crossplot on logarithmic coordinates of effective porosity (φ e ), as determined from neutron and density logs. minus free fluid porosity ((φ[ fluid ) as determined from...