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D'Engelbronner, W., and A. M. HAAK, Clyde Petroleum Exploratie B.V., Den Haag, Netherlands

ABSTRACT: Waalwijk Field History: Impact of Compartmentalization or Layered Depletion on Reservoir Management

In l991, the onshore Waalwijk field was brought on stream with two wells producing gas from upper and middle Bunter at a maximum capacity of 1.35 million cu m/day. The reservoir consists of stacked alluvial fan deposits alternated with flood plain and lake sediments providing intrareservoir seals.

Early field data showed a large discrepancy between volumetrics and material balance. It was recognized that highly permeable layers (some 40% of volumetric GIIP) contributed to 100% of volumetric depletion, while the tighter zones remained nondepleted or only marginally depleted.

Three-dimensional (3-D) seismic acquisition and thorough petrophysical and geological evaluation of reservoir data provided an adequate geological model as a basis for reservoir simulation. A 3-D numerical simulation model was constructed to study the sensitivity of layered depletion, cross flow, and impact of compartmentalization on recovery.

Based on field observations concurring with simulation results, the off-take plan was revised. Also, nonconventional completion techniques were studied to be applied when drilling additional wells.

Prudent off-take policy was achieved through a firmly integrated disciplinary approach. We found that compartmentalization and layered reservoir depletion reflect similar production behavior. In these cases, proper completion techniques and adjusted off-take policy yield favorable recovery compared to infill drilling.

AAPG Search and Discovery Article #90990©1993 AAPG International Conference and Exhibition, The Hague, Netherlands, October 17-20, 1993.