Numerical reservoir simulation isnow one of the fast growing department of Petroleum industry over the pastseveral decades, because of the high demand for reliable estimations and predictionsof reservoir performance. However the progress in electronic computinghardware, and the significant improvement in methods of numerical analysis werethe major important factors in this achievements in numerical reservoirsimulation of Petroleum reservoirs.Before conducting Field Historymatching process in any oilfield or Reservoir, Engineer needs to study Reservoirmodels which provide much understanding of the study Area before predictingreservoir performance this is the one of the most important activities Engineermust perform during the process of developing and managing the petroleumreservoirs. The Matched model are fundamental in making reliable futureforecasts possible, and give an idea of the level of understanding of thegeological and reservoir models. Depending on available field production data,and complexity of a reservoir, the History matching process may be very timeconsuming.
To achieve matched model, some changes (Parameters) can be conductedon the geological and reservoir models, mainly in those attributes with higheruncertainty, for example, relative permeability curves, its distributionthrough the reservoir, and other parameters with few samples. The objectives of this work is toperform history matching on the Zhaozhouqiao oil field specifically Zh86 Block usingSchlumberger’s simulation software Petrel-RE 2014. History matching will bedone based on trial and error by modifying some reservoir properties, end point scaling and by modeling and including theaquifer support into the system. The best history match was achieved bymodifying the critical water saturation in the system, modeling an aquifersupport using Carter Tracy Aquifer model and by modifying the horizontal andvertical Permeabilities of the model. After the history match is achieved twoprediction strategies are developed and compared, where we did forward modelingto build some confidence level in the reservoir model.
Production indexes;water cut, water production, oil production and oil rate of wells and the fieldas a whole were forecasted. Results of the indexes were presented against time andanalyzed. The results portrayed that Zh86 Block in Zhaozhouqiao oil field isstill very promising in terms of production. An Uncertainty and sensitivityassessment was done on the reservoir model to analyze the impact certainreservoir properties have on the volume calculations and simulation results inthe Zh86 Block reservoir model. The impact of uncertainty in our Sw and contactpositions on volume calculations in this model can be seen.
The impact of the grid resolutionin placing horizontal wells was also studied, a synthetic model of the Zh86Block was built selecting the varying grid resolutions both laterally andvertically, and then properties were upscaled to the models and a well-placedbelow an impermeable shale zone in each model to determine the optimumlocation. Using a model with a fine grid resolution enables you to place thewell in the best position in the reservoir model.