Improved Reservoir Characterization of Tight Carbonate Rocks using Multiple High-Resolution Logging While Drilling Technologies for Completion and Stimulation Optimization with Fishbone Technologies; A Case Study from Offshore Abu Dhabi

Objective of this real case study was to test new technology of stimulation in tight rock along the horizontal drain. The reservoir architecture corresponds to stacked zones interbeded of porous and dense rocks. The dense ensure a vertical seal between the reservoir zones. The thickness of theses layers are varing from an area to other. Stylolite and feaw fractures were mapped and occurred maily in the dense zones. The study showed that the fractures are bded confined and very rarely they put incommunication two porous zones. The targeted reservoir lithology is predominantly limestone with variable percentages of dolomite (20 to more than 50%), exhibiting laterally variable micro to miso pore texture. Saturation calculations using conventional open hole logs data shows high uncertainty associated to quantifying movable from bounded fluid and their type. A new real-time petrophysical data acquisition program, using Logging While Drilling (LWD) technologies, is implemented in this case study to estimate the proportion of connate and free fluid distributions along a horizontal well section and to predict permeability, to help decide for depth of perforation for stimulation and optimize lower completion design.