Oil recourses of continental shelf are estimated about 457 billion tons of oil equivalent. According to International Energy Agency data 1/3 of world’s oil and gas production is produced by marine oilfields and its share will grow in the future. Specific location of marine oil and gas fields put certain limits on all stages of fields development, from well patterns to oilfield infrastructure taking into account producing volumes, its physical and chemical properties, weather conditions, distance to the shore, water depth, onshore infrastructure, transport of oil and gas to consumer and many other factors. At the initial stage of oil field development, geology is the main factor, which defines the amount of proved oil and gas reserves. Uncertainty in parameters such as shape and size of an oilfield, oil-water contact position, fault’s position and transmissibility, collector distribution and concatenation, areas of perspective reserves is quite high. Development projects on marine shelf require substantial investments due to higher cost of prospecting, drilling, construction and service, production transport, environment protection activities. Therefore, uncertainty assessment and creating measures to lower the risks play key role at the initial stage of shelf oilfields development.
This article presents the results of Beluga oilfield reservoir characterization refinement using logs, seismic, production and dynamic well test data. Based on updated geological model, the well patterns and drilling priorities were changed and additional well intervention measures have been taken.
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