Water-injection is often implemented in oil reservoirs with mainly two goals. On one hand, it provides an efficient means of secondary production in water-wet fields by sweepage and pressure maintenance. On the other hand and precisely because of pressure maintenance it generally contributes to mitigate compaction and subsidence of highly compactable reservoirs. This last function is however severely put in question by the mechanical behaviour of North Sea chalk fields submitted to massive water-injection. From experimental results common to most labs we develop several models including a water-induced compaction, which allow to restore numerous field observations remained unexplained until now.

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