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ABSTRACT: Geologic Controls on Reservoir Performance Through Time in the Flow Station 2 Area, Prudhoe Bay Field, Alaska

ELDREDGE, SARAH, BP Exploration, Anchorage, AK

Thirteen years of production and fluid movement provide the keys to understanding the geologic controls on reservoir performance in the Prudhoe Bay field. The Flow Station 2 (FS-2) area, a waterflood and miscible injectant project that includes 180 wells in the field, has shown a significantly different performance history than the rest of the project areas in Prudhoe Bay. Four major geologic controls influence FS-2 performance: complete truncation of the reservoir by a major unconformity, an abundance of continuous shales, normal faulting, and variable rock properties. Understanding and documenting these geologic controls allows improved reservoir development. New well locations, individual well workovers, waterflood maintenance, tertiary recovery, and large project plans can all be ptimized. The FS-2 project has already produced 1.5 billion bbl of oil, and still has significant reserves, which must be carefully produced to maximize recovery. Flow Station 2 is presented as a case example of the importance of using production data and fluid movements through time to improve reservoir description by understanding the geologic controls on reservoir performance. The reservoir description of the Prudhoe Bay field has been completely reworked in the last two years. The reservoir is now layered in hydraulic units and the fluids are tracked within these units through time. This improved reservoir description is being used to predict fluid movements and to plan future development in the field.

 

AAPG Search and Discovery Article #91015©1992 AAPG International Conference, Sydney, N.S.W., Australia, August 2-5, 1992 (2009)