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7th Middle East Geosciences Conference and Exhibition
Manama, Bahrain
March 27-29, 2006
1 Midland Valley Exploration Ltd, 14 Park Circus, Glasgow, G3 6AX, United Kingdom, phone: 44
141 332 2681, fax: 44 141 332 2681, [email protected]
2 Chevron Energy Technology Company, 1500 Louisiana, Houston, 77002
3 Chevron International Exploration and Production Company
Fractured reservoir models can be built from static
properties
or from
properties
derived from a restoration of the interpreted
structural history of the reservoir. Strain-based fracture models ideally require some knowledge of the rock
properties
at the
time of deformation in order to predict fracture orientations and intensity. In order to evaluate the importance of the geologic
history relative to measured and known reservoir attributes related to fractures, a Discrete Feature Network (DFN) fracture
model was generated from
properties
defined within the reservoir geocellular model. Fracture orientation
properties
obtained from selected wells were distributed through the reservoir away from well data locations using an interpolation
algorithm. Key wells were withheld from the distribution calculation to test the validity of the distribution of the final DFN.
Other
properties
in the geocellular model, porosity, density, and seismic coherency, were used to constrain fracture
intensity and were combined with the fracture orientation
properties
to generate fractures throughout the reservoir model.
Properties
calculated from the DFN are output directly into the reservoir property model as
properties
in addition to existing
matrix
properties
to create a fracture permeability property model ready for input to a flow simulator. Because the
calculation is fast, and can be done within the property model, it allows adjustments to be made where needed by using the
well production data to constrain the fracture length and aperture values. A fracture model was developed that honors well
data that can be used to further develop a field or plan enhanced recovery methods.