This paper presents the implementation of an integrated reservoir modeling approach that tightly connects and integrates different reservoir modeling disciplines. The approach allows the propagation of subsurface reservoir uncertainties across the various modelling domains, from seismic interpretation though to dynamic reservoir simulation and surface facilities modeling. The results achieved by this approach is a geologically consistent ensemble of runs (100 runs or more) that matches observed data and capable of predicting the future field performance under various development scenarios with a higher degree of reliability. Using an ensemble of runs that first honor the geological facies, as initially defined in the prior probability field, and subsequently updated by reservoir production behavior in the post probability field, enables the user to predict future field performance by allowing hydrocarbon recovery probabilities to be calculated, where the impact of subsurface reservoir uncertainties on prediction results and the possible risk in each development decision is estimated. The field studied is located Offshore in Abu Dhabi and has four main, two secondary, and few minor stacked carbonate reservoirs. Available evidence indicates that the field's reservoirs are not in communication and this study focuses on the main and secondary units. The conceptual geological model proposes that all the zones are conformable, with no truncation or pinching, forming a layer cake depositional model in which reservoirs range in thickness, from few feet in thin zones, to tens of feet in thick zones. Over time the field has been affected by different tectonic stress regimes, resulting in complex strike slip faulting, extending vertically across all reservoirs. Quantification of static and dynamic uncertainties together in the applied methodology is improving the team integration and common understanding for the field structural and geomodelling uncertainties and its impact on the dynamic model behavior for different reservoirs. The methodology has been tested where new drilled well data is included at different times and it showed an easy and quick update for the entire workflow from seismic to simulation. The model was calibrated to historical observed data using different geological uncertainties (structural, facies, geomodelling and dynamic uncertainties) which helped to achieve a geologically consistent and reliable models.

The lower cretaceous Formation reservoirs in Offshore Abu Dhabi represent a regressive cycles of sedimentation developed with shoal, laggonal, subtidal and supratidal sediments. This formation includes various types of lithologies along the reservoir column: Anhydrite alternating with Dolomites, limestone.In such mature, heterogeneous oil reservoirs with a large gas cap, information may improve cost effective productivity, reduce the risks and improve the oil recovery. Special analysis of pressure measurement, fluid scanning and sampling while drilling is important to challenge open hole log saturation, to understand the behavior of each layer in the reservoir, to assess the communication between the sub layers, and to enhance the development schemes. This study is a synthesis of all the Open-hole Vertical Pressure Profiling data sush as formation evaluation and sampling that has been performed through the history of the fields.Investigations have been conducted on the identification of the in-situ reservoir fluid nature; the hydraulic vertical communication between layers; pressure maintenance mechanisms effect and pressure evolution through time and its link with lateral communication.Furthermore from operational point of view best practices have been developed for a safe and efficient procedure in terms of data acquisition and analysis with the limitations of the formation testing tool.