An integrated sequence stratigraphic/engineering study of the Woodbine reservoir in the East Fault Block of the Hawkins Field was undertaken to optimize depletion and operating strategies and profitability of a unique immiscible gas drive/gravity drainage EOR project in a complex fluvially dominated memoir system. Specific study objectives were to reduce future development drilling requirements, improve success and performance of all future well workovers, and maximize EOR reserves recovery through enhanced depletion and operating strategies. The study objectives were achieved through a two-phase iterative and integrated work process: 1) delineation and mapping of reservoir geometries and continues, and 2) integration of production data with the sequence stratigraphic framework of the reservoir.

The 500-foot-thick Woodbine reservoir is divisible into two fluvially dominated sequence sets. The lower sequence set is characterized by sand-prone, high-frequency sequences marked by multistory, laterally extensive lowstand channels, overlain by thin, laterally discontinuous flood-plain mudstones of the transgressive systems tract. The sequences of the upper sequence set contain thinner, laterally discontinuous lowstand channels and are dominated by fine-grained floodplain deposits of the transgressive systems tract. The sequences display an overall retrogradational stacking arrangement marked by a progressive upward decrease in overall reservoir net/gross and lateral continuity and a corresponding increase in thickness and continuity of the flood-plain mudstone components.

Integration of production data with the sequence stratigraphic framework resulted in identification of complex flow unit geometries, and documentation of the movement of fluid contacts through tortuous reservoir pathways over time. Significant results were achieved in all aspects of production operations, including a major reduction in development drilling requirements and a dramatic increase in well workover success rates and performance. EOR project profitability has been increased by improved reserves recovery, accelerated oil production, and reduced operating costs.

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