--> Increasing Reserves Through the Characterization & 3-D Static Model of Thin Beds in a Middle Burgan Reservoir, Raudhtain Field, North Kuwait

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Increasing Reserves Through the Characterization & 3-D Static Model of Thin Beds in a Middle Burgan Reservoir, Raudhtain Field, North Kuwait

Abstract

The Raudhtain Middle Burgan Reservoir is considered an underdeveloped minor reservoir in the North Kuwait Resource Portfolio. It has a high degree of reservoir rock heterogeneity, and until recently, the establishment of mobile oil was given low priority. In the presence of giant reservoirs, the Middle Burgan formation is one of the ‘Minor Reservoirs’ thought to have limited opportunity for production increase. Improved reservoir characterization and subsequent high definition 3D Static model increased the possibility of successfully testing Middle Burgan. The successful testing results from the idle well bore penetrating the reservoir showed the reservoir to have potential for dry oil production. These results were used to support a development plan for the reservoir and to identify follow-up actions that will aid increased oil production and reserve addition. The Middle Burgan Formation is a stacked shoreface deposit forming prograding parasequence sets made up of upward-cleaning and shallowing parasequences. The parasequence sets reflect the overall transition in depositional environment from muddy offshore deposits, through heterolithic offshore transition zone deposits, to lower shoreface sandstones. Middle Burgan Reservoir was subdivided to 4 major layers and 17 sub layers based on sequence stratigraphy and rock quality index. These geological layers, combined with 3D seismic data, provided the framework for the structural model. The high-resolution geocellular model was built while integrating all the components, which included the deterministic structure maps and petrophysical results. The model and visualization proved valuable for interpreting the primary depositional and secondary digenetic processes that left their influence on Middle Burgan rocks. The study helped in understanding the reservoir heterogeneity and reduced the uncertainty in the identification of sand. With this more accurate estimation of water saturation, resources previously qualified as “wet” in normal clastic reservoirs, can now be exploited as producible reserves. In addition, the study helped to develop the Middle Burgan Reservoir leading to new Drilling and Workover opportunities. This led to increase in Oil Production, and estimated 100% increase in recoverable reserves. Ultimately this study supported a long-term development plan and reserves growth for North Kuwait.