F17 Chalk Fracture Model

The F17 field is a fractured chalk oil reservoir located in the Dutch part of the North Sea. The field is in the appraisal phase and moving towards the development phase. Since 2012 four wells have been drilled and well tests have been performed. The main reservoir is formed by Upper Creatceous (Maastrichtian) Chalk with minor contributions from the Cenomanian Texel Chalk below. The matrix of the Chalk formation is characterised by high porosity and low permeability. A low porosity-high permeability fracture network provides the pathways for fluid flow. Faults and fractures are formed by a combination of oblique movement and extension related to the updoming of salt. Five groups of fractures can be distinguished: Faults (large scale), lineaments and sub-seismic lineaments (formation bound), joints/diffuse fractures (small scale layer bound), and micro fractures. Integrated reservoir modelling (static modelling, fracture modelling, dynamic modelling) was performed to assist field development planning. Low, mid and high cases for the fracture model and the dynamic model where obtained and used in history match and production forecasts.