Mauddud Fractured Reservoir Analysis, Greater Burgan field: Integrated Fracture Characterization using Static and Dynamic Data

The understanding of the flowing behavior coming from Mauddud carbonate reservoir in Greater Burgan field has always been a matter of debate. This reservoir is composed of tight complex carbonates with net gross pay that ranges from 10 up to 25 feet. Its porosity response is generally low, as well as its matrix permeability. The best strategy for reservoir exploitation it is for sure by mean of horizontal drilling but results did not match expectative, since some unsuccessful wells were drilled. For aforementioned reasons it is crucial to understand and characterize the presence of fractures in the Mauddud carbonate reservoir as well as the presence of vugs and leached features in order to establish if the observed production is related to matrix or to the fracture network contribution. The understanding of the relationship between matrix characteristics, fracture distribution, and well production will allow planning a better developing strategy for the sweet spots. This paper describes initially the results of geological fracture characterization, and then presents the integration of such results with available dynamic data. Main results obtained from geological characterization are that fractures are mainly faultrelated, limited in height by the carbonate reservoir, and sometimes oil bearing even if no oil stains were found in matrix. The study of dynamic data, combined with the geological results, was mainly dedicated to recognize the well flowing regimes that cannot be associated only to matrix contribution, but that are probably due to a flowing from fractures. Obtained results could lead to better diagnostic and better development strategies in this challenging reservoir.