Castillo Vincentelli, Maria Gabriela [UNESP]Caceres Contreras, Sergio Antonio [UNESP]2018-11-262018-11-262016-12-01Journal Of Geophysics And Engineering. Bristol: Iop Publishing Ltd, v. 13, n. 6, 7 p., 2016.1742-2132http://hdl.handle.net/11449/159147One of the main objectives for petroleum exploration is to quantify the reservoir's oil in place; usually this process is based on a petrophysical evaluation that, among other parameters, the reservoir water saturation (S-w) must be calculated, because it represents the main factor for determining hydrocarbon saturation (S-h). Classical petrophysical analysis includes the use of the water saturation's resistivity (R-w) and two main constants (for Archie saturation), as well as cementation (m) and tortuosity (a); both of which are obtained from laboratory plug/cores measurements. However, in the case of ancient Albian carbonate reservoirs (Brazil), this kind of data is not available for a fully water saturated reservoir, and as a consequence, we proposed to apply a logarithmic graphic solution of the main Archie's equations to determine these main factors using a linear regression based on wire logs. As result, an R-w was confirmed at 127 Kppm of NaCl for Quissama Formation, m = 1.071 and a = 0.87. Finally, the value of 'm' is more affected by the pore and size configuration, and the 'a' value appears to be a logical answer for carbonates reservoir with high porosity.7engpetrophysics for carbonatescementationtortuositywater formation resistivityArchie's core estimation parametersArtigo10.1088/1742-2132/13/6/880WOS:000386041800002Acesso abertoWOS000386041800002.pdf