Publications

In thinly laminated reservoirs, the determination of oil saturation from conventional resistivity and porosity logs is very challenging and in most cases found not to be representative. When the thickness of the layer is less than the vertical resolution of the measured log, the reading is not the true value of the layer. To address these challenges, several methods have been developed. One of these methods is to enhance the vertical resolution of the standard logs using a very high resolution log derived from borehole images. The other method introduced in recent years, is the measurement of both vertical and horizontal resistivity of the formation with a triaxial induction device. The anisotropy derived from these two directional resistivity measurements can be caused by thin layers lamination, which is highlighted by the vertical resistivity measurement only. The combination of these two methods provides a set of enhanced logs with reasonable depth of investigation with the additional information on anisotropy caused by the thin lamination reservoirs. Using these set of logs in an elemental analysis model, can provide a very detailed formation volumetric model, with layers representative of the thin laminations. A saturation profile is computed which leads to a better understanding of the reservoir and additional information for further investigations such as formation testing and perforation.