Name

Harlingen Subsidence Study

The Harlingen Chalk gas field is located in the western part of the Leeuwarden concession in the
province of Friesland, onshore northern Netherlands. It is located between the towns of Franeker
and Harlingen. The crest of the chalk reservoir is at a depth of 1026 mTVDss and the maximum
thickness of the gas bearing zone is some 30 m. The field’s areal extent is 6 by 10 km and is
notionally split into up to five sectors with varying amounts of connectivity based on different initial
GWC and production performance information. The initial gas in place is estimated to be
approximately 5x109 Sm3.