This paper is a case study calibrating well log derived lithology indicators with productivity attributes from modern production logs. More than thirty wells drilled thirty years ago into the South Ellwood Field were completed based on limited understanding of the well log responses in the complex Monterey Formation. From a retrospective study of well productivity, Wylie, Ershaghi and Christensen1  presented a pattern recognition technique for identifying productive intervals. Availability of recently obtained state-of-the-art production logs has provided invaluable information about the relevance of the well log derived potential zones to positively tested productive and undamaged intervals.

This paper includes an analysis of the information processing from the Flow View and Gas Holdup Sensor Tool. A calibration of production log data and well log lithology pattern studies is the basis of designing a re-development strategy for untapped intervals not perforated in the initial completion work. Furthermore, the calibration methodology is extended to a nearby field with similar geology for reassessment of reserves potential.

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