Since almost a century, logging has been the key to unlock the reservoir potential in the oil and gas industry and the road towards the new discoveries all over the world. Petrophysics is considered the core of the subsurface evaluation from the new ventures through to mature reservoirs. With the revolution in the logging tools, log analysis has become the greatest link between geoscience and engineering.

Several workflows have been developed for effective formation evaluation, either in simple reservoirs or in the rocks of complex lithologies. However, all have been established to define four main output profiles, the clay volume, formation porosity, reservoir saturation and rock permeability. With the evolution of the current tools and rock measurements available, accuracy in the reservoir petrophysical properties has become a major factor in all prospects assessment. Several well log examples will be presented with the complete petrophysical interpretation workflow, from the detection of formation lithology and clay volume calculation to the permeability dependent on rock types.

As our industry journey advances, petrophysics lightens the road for the new successful subsurface stories, and it will for many years to come