This paper describes novel methods for fracture description and implications by using well logs, core data, well tests and geological inteipretation.

The type, amount and orientation of fractures and fracture systems have major impact on field behaviour. We present methods to estimate in situ stress and fractures from logs. Fracture description from cores further enhance the proposed description of the fracture system. The paper also show how well test data give quantitative informations about fracture conductivity initially and during field depletion.

If fracture conductivity exceeds a fracture intensity threshold, separate matrix blocks occur. We identified such systems by a new method which identify individual capillary pressure systems and thereby individual matrix blocks. We also used the method to identify in situ wettability.

The methods presented in this paper we successfully used for some North Sea Chalk fields.

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