Development of unconventional oil plays worldwide demonstrated that conventional characterization of such rocks in terms of a total porosity and total water saturation does not always provide enough information for completion and drilling decisions. The characterization and quantification of different fluids in different pore space together with a coupled geomechanical model is key for "sweet spots" detection for wells placement, stimulation and production. Based on our experience we present in this paper how an integration between geochemical analyses and advanced logging technologies can improve formation characterization in unconventional rocks; help to identify target intervals for wells stimulation and testing at an early exploration stage. The workflow was developed for the Shilaif formation evaluation in Abu Dhabi and allows fluids typing and their quantification in different pore systems from advanced logs data interpretation calibrated to full size and pressurized sidewall core special analyses. Detailed description of the workflow and results of its application showing reservoir and hydrocarbons quality variation within the Shilaif formation in wells from synclines and anticlines are presented in this paper.